HTML Examples/WP.iso/wordpress/wp-includes/media.php

PHP Script | 2018-01-15 | 135.1 KB | 3,959 lines

<?php
/**
 * WordPress API for media display.
 *
 * @package WordPress
 * @subpackage Media
 */

/**
 * Retrieve additional image sizes.
 *
 * @since 4.7.0
 *
 * @global array $_wp_additional_image_sizes
 *
 * @return array Additional images size data.
 */
function wp_get_additional_image_sizes() {
    global $_wp_additional_image_sizes;
    if ( ! $_wp_additional_image_sizes ) {
        $_wp_additional_image_sizes = array();
    }
    return $_wp_additional_image_sizes;
}

/**
 * Scale down the default size of an image.
 *
 * This is so that the image is a better fit for the editor and theme.
 *
 * The `$size` parameter accepts either an array or a string. The supported string
 * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
 * 128 width and 96 height in pixels. Also supported for the string value is
 * 'medium', 'medium_large' and 'full'. The 'full' isn't actually supported, but any value other
 * than the supported will result in the content_width size or 500 if that is
 * not set.
 *
 * Finally, there is a filter named {@see 'editor_max_image_size'}, that will be
 * called on the calculated array for width and height, respectively. The second
 * parameter will be the value that was in the $size parameter. The returned
 * type for the hook is an array with the width as the first element and the
 * height as the second element.
 *
 * @since 2.5.0
 *
 * @global int   $content_width
 *
 * @param int          $width   Width of the image in pixels.
 * @param int          $height  Height of the image in pixels.
 * @param string|array $size    Optional. Image size. Accepts any valid image size, or an array
 *                              of width and height values in pixels (in that order).
 *                              Default 'medium'.
 * @param string       $context Optional. Could be 'display' (like in a theme) or 'edit'
 *                              (like inserting into an editor). Default null.
 * @return array Width and height of what the result image should resize to.
 */
function image_constrain_size_for_editor( $width, $height, $size = 'medium', $context = null ) {
    global $content_width;

    $_wp_additional_image_sizes = wp_get_additional_image_sizes();

    if ( ! $context )
        $context = is_admin() ? 'edit' : 'display';

    if ( is_array($size) ) {
        $max_width = $size[0];
        $max_height = $size[1];
    }
    elseif ( $size == 'thumb' || $size == 'thumbnail' ) {
        $max_width = intval(get_option('thumbnail_size_w'));
        $max_height = intval(get_option('thumbnail_size_h'));
        // last chance thumbnail size defaults
        if ( !$max_width && !$max_height ) {
            $max_width = 128;
            $max_height = 96;
        }
    }
    elseif ( $size == 'medium' ) {
        $max_width = intval(get_option('medium_size_w'));
        $max_height = intval(get_option('medium_size_h'));

    }
    elseif ( $size == 'medium_large' ) {
        $max_width = intval( get_option( 'medium_large_size_w' ) );
        $max_height = intval( get_option( 'medium_large_size_h' ) );

        if ( intval( $content_width ) > 0 ) {
            $max_width = min( intval( $content_width ), $max_width );
        }
    }
    elseif ( $size == 'large' ) {
        /*
         * We're inserting a large size image into the editor. If it's a really
         * big image we'll scale it down to fit reasonably within the editor
         * itself, and within the theme's content width if it's known. The user
         * can resize it in the editor if they wish.
         */
        $max_width = intval(get_option('large_size_w'));
        $max_height = intval(get_option('large_size_h'));
        if ( intval($content_width) > 0 ) {
            $max_width = min( intval($content_width), $max_width );
        }
    } elseif ( ! empty( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ) ) ) {
        $max_width = intval( $_wp_additional_image_sizes[$size]['width'] );
        $max_height = intval( $_wp_additional_image_sizes[$size]['height'] );
        // Only in admin. Assume that theme authors know what they're doing.
        if ( intval( $content_width ) > 0 && 'edit' === $context ) {
            $max_width = min( intval( $content_width ), $max_width );
        }
    }
    // $size == 'full' has no constraint
    else {
        $max_width = $width;
        $max_height = $height;
    }

    /**
     * Filters the maximum image size dimensions for the editor.
     *
     * @since 2.5.0
     *
     * @param array        $max_image_size An array with the width as the first element,
     *                                     and the height as the second element.
     * @param string|array $size           Size of what the result image should be.
     * @param string       $context        The context the image is being resized for.
     *                                     Possible values are 'display' (like in a theme)
     *                                     or 'edit' (like inserting into an editor).
     */
    list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size, $context );

    return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
}

/**
 * Retrieve width and height attributes using given width and height values.
 *
 * Both attributes are required in the sense that both parameters must have a
 * value, but are optional in that if you set them to false or null, then they
 * will not be added to the returned string.
 *
 * You can set the value using a string, but it will only take numeric values.
 * If you wish to put 'px' after the numbers, then it will be stripped out of
 * the return.
 *
 * @since 2.5.0
 *
 * @param int|string $width  Image width in pixels.
 * @param int|string $height Image height in pixels.
 * @return string HTML attributes for width and, or height.
 */
function image_hwstring( $width, $height ) {
    $out = '';
    if ($width)
        $out .= 'width="'.intval($width).'" ';
    if ($height)
        $out .= 'height="'.intval($height).'" ';
    return $out;
}

/**
 * Scale an image to fit a particular size (such as 'thumb' or 'medium').
 *
 * Array with image url, width, height, and whether is intermediate size, in
 * that order is returned on success is returned. $is_intermediate is true if
 * $url is a resized image, false if it is the original.
 *
 * The URL might be the original image, or it might be a resized version. This
 * function won't create a new resized copy, it will just return an already
 * resized one if it exists.
 *
 * A plugin may use the {@see 'image_downsize'} filter to hook into and offer image
 * resizing services for images. The hook must return an array with the same
 * elements that are returned in the function. The first element being the URL
 * to the new image that was resized.
 *
 * @since 2.5.0
 *
 * @param int          $id   Attachment ID for image.
 * @param array|string $size Optional. Image size to scale to. Accepts any valid image size,
 *                           or an array of width and height values in pixels (in that order).
 *                           Default 'medium'.
 * @return false|array Array containing the image URL, width, height, and boolean for whether
 *                     the image is an intermediate size. False on failure.
 */
function image_downsize( $id, $size = 'medium' ) {
    $is_image = wp_attachment_is_image( $id );

    /**
     * Filters whether to preempt the output of image_downsize().
     *
     * Passing a truthy value to the filter will effectively short-circuit
     * down-sizing the image, returning that value as output instead.
     *
     * @since 2.5.0
     *
     * @param bool         $downsize Whether to short-circuit the image downsize. Default false.
     * @param int          $id       Attachment ID for image.
     * @param array|string $size     Size of image. Image size or array of width and height values (in that order).
     *                               Default 'medium'.
     */
    if ( $out = apply_filters( 'image_downsize', false, $id, $size ) ) {
        return $out;
    }

    $img_url = wp_get_attachment_url($id);
    $meta = wp_get_attachment_metadata($id);
    $width = $height = 0;
    $is_intermediate = false;
    $img_url_basename = wp_basename($img_url);

    // If the file isn't an image, attempt to replace its URL with a rendered image from its meta.
    // Otherwise, a non-image type could be returned.
    if ( ! $is_image ) {
        if ( ! empty( $meta['sizes'] ) ) {
            $img_url = str_replace( $img_url_basename, $meta['sizes']['full']['file'], $img_url );
            $img_url_basename = $meta['sizes']['full']['file'];
            $width = $meta['sizes']['full']['width'];
            $height = $meta['sizes']['full']['height'];
        } else {
            return false;
        }
    }

    // try for a new style intermediate size
    if ( $intermediate = image_get_intermediate_size($id, $size) ) {
        $img_url = str_replace($img_url_basename, $intermediate['file'], $img_url);
        $width = $intermediate['width'];
        $height = $intermediate['height'];
        $is_intermediate = true;
    }
    elseif ( $size == 'thumbnail' ) {
        // fall back to the old thumbnail
        if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) {
            $img_url = str_replace($img_url_basename, wp_basename($thumb_file), $img_url);
            $width = $info[0];
            $height = $info[1];
            $is_intermediate = true;
        }
    }
    if ( !$width && !$height && isset( $meta['width'], $meta['height'] ) ) {
        // any other type: use the real image
        $width = $meta['width'];
        $height = $meta['height'];
    }

    if ( $img_url) {
        // we have the actual image size, but might need to further constrain it if content_width is narrower
        list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );

        return array( $img_url, $width, $height, $is_intermediate );
    }
    return false;

}

/**
 * Register a new image size.
 *
 * Cropping behavior for the image size is dependent on the value of $crop:
 * 1. If false (default), images will be scaled, not cropped.
 * 2. If an array in the form of array( x_crop_position, y_crop_position ):
 *    - x_crop_position accepts 'left' 'center', or 'right'.
 *    - y_crop_position accepts 'top', 'center', or 'bottom'.
 *    Images will be cropped to the specified dimensions within the defined crop area.
 * 3. If true, images will be cropped to the specified dimensions using center positions.
 *
 * @since 2.9.0
 *
 * @global array $_wp_additional_image_sizes Associative array of additional image sizes.
 *
 * @param string     $name   Image size identifier.
 * @param int        $width  Image width in pixels.
 * @param int        $height Image height in pixels.
 * @param bool|array $crop   Optional. Whether to crop images to specified width and height or resize.
 *                           An array can specify positioning of the crop area. Default false.
 */
function add_image_size( $name, $width = 0, $height = 0, $crop = false ) {
    global $_wp_additional_image_sizes;

    $_wp_additional_image_sizes[ $name ] = array(
        'width'  => absint( $width ),
        'height' => absint( $height ),
        'crop'   => $crop,
    );
}

/**
 * Check if an image size exists.
 *
 * @since 3.9.0
 *
 * @param string $name The image size to check.
 * @return bool True if the image size exists, false if not.
 */
function has_image_size( $name ) {
    $sizes = wp_get_additional_image_sizes();
    return isset( $sizes[ $name ] );
}

/**
 * Remove a new image size.
 *
 * @since 3.9.0
 *
 * @global array $_wp_additional_image_sizes
 *
 * @param string $name The image size to remove.
 * @return bool True if the image size was successfully removed, false on failure.
 */
function remove_image_size( $name ) {
    global $_wp_additional_image_sizes;

    if ( isset( $_wp_additional_image_sizes[ $name ] ) ) {
        unset( $_wp_additional_image_sizes[ $name ] );
        return true;
    }

    return false;
}

/**
 * Registers an image size for the post thumbnail.
 *
 * @since 2.9.0
 *
 * @see add_image_size() for details on cropping behavior.
 *
 * @param int        $width  Image width in pixels.
 * @param int        $height Image height in pixels.
 * @param bool|array $crop   Optional. Whether to crop images to specified width and height or resize.
 *                           An array can specify positioning of the crop area. Default false.
 */
function set_post_thumbnail_size( $width = 0, $height = 0, $crop = false ) {
    add_image_size( 'post-thumbnail', $width, $height, $crop );
}

/**
 * Gets an img tag for an image attachment, scaling it down if requested.
 *
 * The {@see 'get_image_tag_class'} filter allows for changing the class name for the
 * image without having to use regular expressions on the HTML content. The
 * parameters are: what WordPress will use for the class, the Attachment ID,
 * image align value, and the size the image should be.
 *
 * The second filter, {@see 'get_image_tag'}, has the HTML content, which can then be
 * further manipulated by a plugin to change all attribute values and even HTML
 * content.
 *
 * @since 2.5.0
 *
 * @param int          $id    Attachment ID.
 * @param string       $alt   Image Description for the alt attribute.
 * @param string       $title Image Description for the title attribute.
 * @param string       $align Part of the class name for aligning the image.
 * @param string|array $size  Optional. Registered image size to retrieve a tag for. Accepts any
 *                            valid image size, or an array of width and height values in pixels
 *                            (in that order). Default 'medium'.
 * @return string HTML IMG element for given image attachment
 */
function get_image_tag( $id, $alt, $title, $align, $size = 'medium' ) {

    list( $img_src, $width, $height ) = image_downsize($id, $size);
    $hwstring = image_hwstring($width, $height);

    $title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';

    $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;

    /**
     * Filters the value of the attachment's image tag class attribute.
     *
     * @since 2.6.0
     *
     * @param string       $class CSS class name or space-separated list of classes.
     * @param int          $id    Attachment ID.
     * @param string       $align Part of the class name for aligning the image.
     * @param string|array $size  Size of image. Image size or array of width and height values (in that order).
     *                            Default 'medium'.
     */
    $class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );

    $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" ' . $title . $hwstring . 'class="' . $class . '" />';

    /**
     * Filters the HTML content for the image tag.
     *
     * @since 2.6.0
     *
     * @param string       $html  HTML content for the image.
     * @param int          $id    Attachment ID.
     * @param string       $alt   Alternate text.
     * @param string       $title Attachment title.
     * @param string       $align Part of the class name for aligning the image.
     * @param string|array $size  Size of image. Image size or array of width and height values (in that order).
     *                            Default 'medium'.
     */
    return apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
}

/**
 * Calculates the new dimensions for a down-sampled image.
 *
 * If either width or height are empty, no constraint is applied on
 * that dimension.
 *
 * @since 2.5.0
 *
 * @param int $current_width  Current width of the image.
 * @param int $current_height Current height of the image.
 * @param int $max_width      Optional. Max width in pixels to constrain to. Default 0.
 * @param int $max_height     Optional. Max height in pixels to constrain to. Default 0.
 * @return array First item is the width, the second item is the height.
 */
function wp_constrain_dimensions( $current_width, $current_height, $max_width = 0, $max_height = 0 ) {
    if ( !$max_width && !$max_height )
        return array( $current_width, $current_height );

    $width_ratio = $height_ratio = 1.0;
    $did_width = $did_height = false;

    if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) {
        $width_ratio = $max_width / $current_width;
        $did_width = true;
    }

    if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) {
        $height_ratio = $max_height / $current_height;
        $did_height = true;
    }

    // Calculate the larger/smaller ratios
    $smaller_ratio = min( $width_ratio, $height_ratio );
    $larger_ratio  = max( $width_ratio, $height_ratio );

    if ( (int) round( $current_width * $larger_ratio ) > $max_width || (int) round( $current_height * $larger_ratio ) > $max_height ) {
         // The larger ratio is too big. It would result in an overflow.
        $ratio = $smaller_ratio;
    } else {
        // The larger ratio fits, and is likely to be a more "snug" fit.
        $ratio = $larger_ratio;
    }

    // Very small dimensions may result in 0, 1 should be the minimum.
    $w = max ( 1, (int) round( $current_width  * $ratio ) );
    $h = max ( 1, (int) round( $current_height * $ratio ) );

    // Sometimes, due to rounding, we'll end up with a result like this: 465x700 in a 177x177 box is 117x176... a pixel short
    // We also have issues with recursive calls resulting in an ever-changing result. Constraining to the result of a constraint should yield the original result.
    // Thus we look for dimensions that are one pixel shy of the max value and bump them up

    // Note: $did_width means it is possible $smaller_ratio == $width_ratio.
    if ( $did_width && $w == $max_width - 1 ) {
        $w = $max_width; // Round it up
    }

    // Note: $did_height means it is possible $smaller_ratio == $height_ratio.
    if ( $did_height && $h == $max_height - 1 ) {
        $h = $max_height; // Round it up
    }

    /**
     * Filters dimensions to constrain down-sampled images to.
     *
     * @since 4.1.0
     *
     * @param array $dimensions     The image width and height.
     * @param int     $current_width  The current width of the image.
     * @param int     $current_height The current height of the image.
     * @param int     $max_width      The maximum width permitted.
     * @param int     $max_height     The maximum height permitted.
     */
    return apply_filters( 'wp_constrain_dimensions', array( $w, $h ), $current_width, $current_height, $max_width, $max_height );
}

/**
 * Retrieves calculated resize dimensions for use in WP_Image_Editor.
 *
 * Calculates dimensions and coordinates for a resized image that fits
 * within a specified width and height.
 *
 * Cropping behavior is dependent on the value of $crop:
 * 1. If false (default), images will not be cropped.
 * 2. If an array in the form of array( x_crop_position, y_crop_position ):
 *    - x_crop_position accepts 'left' 'center', or 'right'.
 *    - y_crop_position accepts 'top', 'center', or 'bottom'.
 *    Images will be cropped to the specified dimensions within the defined crop area.
 * 3. If true, images will be cropped to the specified dimensions using center positions.
 *
 * @since 2.5.0
 *
 * @param int        $orig_w Original width in pixels.
 * @param int        $orig_h Original height in pixels.
 * @param int        $dest_w New width in pixels.
 * @param int        $dest_h New height in pixels.
 * @param bool|array $crop   Optional. Whether to crop image to specified width and height or resize.
 *                           An array can specify positioning of the crop area. Default false.
 * @return false|array False on failure. Returned array matches parameters for `imagecopyresampled()`.
 */
function image_resize_dimensions( $orig_w, $orig_h, $dest_w, $dest_h, $crop = false ) {

    if ($orig_w <= 0 || $orig_h <= 0)
        return false;
    // at least one of dest_w or dest_h must be specific
    if ($dest_w <= 0 && $dest_h <= 0)
        return false;

    /**
     * Filters whether to preempt calculating the image resize dimensions.
     *
     * Passing a non-null value to the filter will effectively short-circuit
     * image_resize_dimensions(), returning that value instead.
     *
     * @since 3.4.0
     *
     * @param null|mixed $null   Whether to preempt output of the resize dimensions.
     * @param int        $orig_w Original width in pixels.
     * @param int        $orig_h Original height in pixels.
     * @param int        $dest_w New width in pixels.
     * @param int        $dest_h New height in pixels.
     * @param bool|array $crop   Whether to crop image to specified width and height or resize.
     *                           An array can specify positioning of the crop area. Default false.
     */
    $output = apply_filters( 'image_resize_dimensions', null, $orig_w, $orig_h, $dest_w, $dest_h, $crop );
    if ( null !== $output )
        return $output;

    if ( $crop ) {
        // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
        $aspect_ratio = $orig_w / $orig_h;
        $new_w = min($dest_w, $orig_w);
        $new_h = min($dest_h, $orig_h);

        if ( ! $new_w ) {
            $new_w = (int) round( $new_h * $aspect_ratio );
        }

        if ( ! $new_h ) {
            $new_h = (int) round( $new_w / $aspect_ratio );
        }

        $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);

        $crop_w = round($new_w / $size_ratio);
        $crop_h = round($new_h / $size_ratio);

        if ( ! is_array( $crop ) || count( $crop ) !== 2 ) {
            $crop = array( 'center', 'center' );
        }

        list( $x, $y ) = $crop;

        if ( 'left' === $x ) {
            $s_x = 0;
        } elseif ( 'right' === $x ) {
            $s_x = $orig_w - $crop_w;
        } else {
            $s_x = floor( ( $orig_w - $crop_w ) / 2 );
        }

        if ( 'top' === $y ) {
            $s_y = 0;
        } elseif ( 'bottom' === $y ) {
            $s_y = $orig_h - $crop_h;
        } else {
            $s_y = floor( ( $orig_h - $crop_h ) / 2 );
        }
    } else {
        // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
        $crop_w = $orig_w;
        $crop_h = $orig_h;

        $s_x = 0;
        $s_y = 0;

        list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
    }

    // if the resulting image would be the same size or larger we don't want to resize it
    if ( $new_w >= $orig_w && $new_h >= $orig_h && $dest_w != $orig_w && $dest_h != $orig_h ) {
        return false;
    }

    // the return array matches the parameters to imagecopyresampled()
    // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
    return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );

}

/**
 * Resizes an image to make a thumbnail or intermediate size.
 *
 * The returned array has the file size, the image width, and image height. The
 * {@see 'image_make_intermediate_size'} filter can be used to hook in and change the
 * values of the returned array. The only parameter is the resized file path.
 *
 * @since 2.5.0
 *
 * @param string $file   File path.
 * @param int    $width  Image width.
 * @param int    $height Image height.
 * @param bool   $crop   Optional. Whether to crop image to specified width and height or resize.
 *                       Default false.
 * @return false|array False, if no image was created. Metadata array on success.
 */
function image_make_intermediate_size( $file, $width, $height, $crop = false ) {
    if ( $width || $height ) {
        $editor = wp_get_image_editor( $file );

        if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) )
            return false;

        $resized_file = $editor->save();

        if ( ! is_wp_error( $resized_file ) && $resized_file ) {
            unset( $resized_file['path'] );
            return $resized_file;
        }
    }
    return false;
}

/**
 * Helper function to test if aspect ratios for two images match.
 *
 * @since 4.6.0
 *
 * @param int $source_width  Width of the first image in pixels.
 * @param int $source_height Height of the first image in pixels.
 * @param int $target_width  Width of the second image in pixels.
 * @param int $target_height Height of the second image in pixels.
 * @return bool True if aspect ratios match within 1px. False if not.
 */
function wp_image_matches_ratio( $source_width, $source_height, $target_width, $target_height ) {
    /*
     * To test for varying crops, we constrain the dimensions of the larger image
     * to the dimensions of the smaller image and see if they match.
     */
    if ( $source_width > $target_width ) {
        $constrained_size = wp_constrain_dimensions( $source_width, $source_height, $target_width );
        $expected_size = array( $target_width, $target_height );
    } else {
        $constrained_size = wp_constrain_dimensions( $target_width, $target_height, $source_width );
        $expected_size = array( $source_width, $source_height );
    }

    // If the image dimensions are within 1px of the expected size, we consider it a match.
    $matched = ( abs( $constrained_size[0] - $expected_size[0] ) <= 1 && abs( $constrained_size[1] - $expected_size[1] ) <= 1 );

    return $matched;
}

/**
 * Retrieves the image's intermediate size (resized) path, width, and height.
 *
 * The $size parameter can be an array with the width and height respectively.
 * If the size matches the 'sizes' metadata array for width and height, then it
 * will be used. If there is no direct match, then the nearest image size larger
 * than the specified size will be used. If nothing is found, then the function
 * will break out and return false.
 *
 * The metadata 'sizes' is used for compatible sizes that can be used for the
 * parameter $size value.
 *
 * The url path will be given, when the $size parameter is a string.
 *
 * If you are passing an array for the $size, you should consider using
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 *
 * @param int          $post_id Attachment ID.
 * @param array|string $size    Optional. Image size. Accepts any valid image size, or an array
 *                              of width and height values in pixels (in that order).
 *                              Default 'thumbnail'.
 * @return false|array $data {
 *     Array of file relative path, width, and height on success. Additionally includes absolute
 *     path and URL if registered size is passed to $size parameter. False on failure.
 *
 *     @type string $file   Image's path relative to uploads directory
 *     @type int    $width  Width of image
 *     @type int    $height Height of image
 *     @type string $path   Image's absolute filesystem path.
 *     @type string $url    Image's URL.
 * }
 */
function image_get_intermediate_size( $post_id, $size = 'thumbnail' ) {
    if ( ! $size || ! is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) || empty( $imagedata['sizes'] )  ) {
        return false;
    }

    $data = array();

    // Find the best match when '$size' is an array.
    if ( is_array( $size ) ) {
        $candidates = array();

        if ( ! isset( $imagedata['file'] ) && isset( $imagedata['sizes']['full'] ) ) {
            $imagedata['height'] = $imagedata['sizes']['full']['height'];
            $imagedata['width']  = $imagedata['sizes']['full']['width'];
        }

        foreach ( $imagedata['sizes'] as $_size => $data ) {
            // If there's an exact match to an existing image size, short circuit.
            if ( $data['width'] == $size[0] && $data['height'] == $size[1] ) {
                $candidates[ $data['width'] * $data['height'] ] = $data;
                break;
            }

            // If it's not an exact match, consider larger sizes with the same aspect ratio.
            if ( $data['width'] >= $size[0] && $data['height'] >= $size[1] ) {
                // If '0' is passed to either size, we test ratios against the original file.
                if ( 0 === $size[0] || 0 === $size[1] ) {
                    $same_ratio = wp_image_matches_ratio( $data['width'], $data['height'], $imagedata['width'], $imagedata['height'] );
                } else {
                    $same_ratio = wp_image_matches_ratio( $data['width'], $data['height'], $size[0], $size[1] );
                }

                if ( $same_ratio ) {
                    $candidates[ $data['width'] * $data['height'] ] = $data;
                }
            }
        }

        if ( ! empty( $candidates ) ) {
            // Sort the array by size if we have more than one candidate.
            if ( 1 < count( $candidates ) ) {
                ksort( $candidates );
            }

            $data = array_shift( $candidates );
        /*
         * When the size requested is smaller than the thumbnail dimensions, we
         * fall back to the thumbnail size to maintain backwards compatibility with
         * pre 4.6 versions of WordPress.
         */
        } elseif ( ! empty( $imagedata['sizes']['thumbnail'] ) && $imagedata['sizes']['thumbnail']['width'] >= $size[0] && $imagedata['sizes']['thumbnail']['width'] >= $size[1] ) {
            $data = $imagedata['sizes']['thumbnail'];
        } else {
            return false;
        }

        // Constrain the width and height attributes to the requested values.
        list( $data['width'], $data['height'] ) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );

    } elseif ( ! empty( $imagedata['sizes'][ $size ] ) ) {
        $data = $imagedata['sizes'][ $size ];
    }

    // If we still don't have a match at this point, return false.
    if ( empty( $data ) ) {
        return false;
    }

    // include the full filesystem path of the intermediate file
    if ( empty( $data['path'] ) && ! empty( $data['file'] ) && ! empty( $imagedata['file'] ) ) {
        $file_url = wp_get_attachment_url($post_id);
        $data['path'] = path_join( dirname($imagedata['file']), $data['file'] );
        $data['url'] = path_join( dirname($file_url), $data['file'] );
    }

    /**
     * Filters the output of image_get_intermediate_size()
     *
     * @since 4.4.0
     *
     * @see image_get_intermediate_size()
     *
     * @param array        $data    Array of file relative path, width, and height on success. May also include
     *                              file absolute path and URL.
     * @param int          $post_id The post_id of the image attachment
     * @param string|array $size    Registered image size or flat array of initially-requested height and width
     *                              dimensions (in that order).
     */
    return apply_filters( 'image_get_intermediate_size', $data, $post_id, $size );
}

/**
 * Gets the available intermediate image sizes.
 *
 * @since 3.0.0
 *
 * @return array Returns a filtered array of image size strings.
 */
function get_intermediate_image_sizes() {
    $_wp_additional_image_sizes = wp_get_additional_image_sizes();
    $image_sizes = array('thumbnail', 'medium', 'medium_large', 'large'); // Standard sizes
    if ( ! empty( $_wp_additional_image_sizes ) ) {
        $image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) );
    }

    /**
     * Filters the list of intermediate image sizes.
     *
     * @since 2.5.0
     *
     * @param array $image_sizes An array of intermediate image sizes. Defaults
     *                           are 'thumbnail', 'medium', 'medium_large', 'large'.
     */
    return apply_filters( 'intermediate_image_sizes', $image_sizes );
}

/**
 * Retrieve an image to represent an attachment.
 *
 * A mime icon for files, thumbnail or intermediate size for images.
 *
 * The returned array contains four values: the URL of the attachment image src,
 * the width of the image file, the height of the image file, and a boolean
 * representing whether the returned array describes an intermediate (generated)
 * image size or the original, full-sized upload.
 *
 * @since 2.5.0
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|array $size          Optional. Image size. Accepts any valid image size, or an array of width
 *                                    and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
 * @return false|array Returns an array (url, width, height, is_intermediate), or false, if no image is available.
 */
function wp_get_attachment_image_src( $attachment_id, $size = 'thumbnail', $icon = false ) {
    // get a thumbnail or intermediate image if there is one
    $image = image_downsize( $attachment_id, $size );
    if ( ! $image ) {
        $src = false;

        if ( $icon && $src = wp_mime_type_icon( $attachment_id ) ) {
            /** This filter is documented in wp-includes/post.php */
            $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

            $src_file = $icon_dir . '/' . wp_basename( $src );
            @list( $width, $height ) = getimagesize( $src_file );
        }

        if ( $src && $width && $height ) {
            $image = array( $src, $width, $height );
        }
    }
    /**
     * Filters the image src result.
     *
     * @since 4.3.0
     *
     * @param array|false  $image         Either array with src, width & height, icon src, or false.
     * @param int          $attachment_id Image attachment ID.
     * @param string|array $size          Size of image. Image size or array of width and height values
     *                                    (in that order). Default 'thumbnail'.
     * @param bool         $icon          Whether the image should be treated as an icon. Default false.
     */
    return apply_filters( 'wp_get_attachment_image_src', $image, $attachment_id, $size, $icon );
}

/**
 * Get an HTML img element representing an image attachment
 *
 * While `$size` will accept an array, it is better to register a size with
 * add_image_size() so that a cropped version is generated. It's much more
 * efficient than having to find the closest-sized image and then having the
 * browser scale down the image.
 *
 * @since 2.5.0
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|array $size          Optional. Image size. Accepts any valid image size, or an array of width
 *                                    and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
 * @param string|array $attr          Optional. Attributes for the image markup. Default empty.
 * @return string HTML img element or empty string on failure.
 */
function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') {
    $html = '';
    $image = wp_get_attachment_image_src($attachment_id, $size, $icon);
    if ( $image ) {
        list($src, $width, $height) = $image;
        $hwstring = image_hwstring($width, $height);
        $size_class = $size;
        if ( is_array( $size_class ) ) {
            $size_class = join( 'x', $size_class );
        }
        $attachment = get_post($attachment_id);
        $default_attr = array(
            'src'    => $src,
            'class'    => "attachment-$size_class size-$size_class",
            'alt'    => trim( strip_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) ),
        );

        $attr = wp_parse_args( $attr, $default_attr );

        // Generate 'srcset' and 'sizes' if not already present.
        if ( empty( $attr['srcset'] ) ) {
            $image_meta = wp_get_attachment_metadata( $attachment_id );

            if ( is_array( $image_meta ) ) {
                $size_array = array( absint( $width ), absint( $height ) );
                $srcset = wp_calculate_image_srcset( $size_array, $src, $image_meta, $attachment_id );
                $sizes = wp_calculate_image_sizes( $size_array, $src, $image_meta, $attachment_id );

                if ( $srcset && ( $sizes || ! empty( $attr['sizes'] ) ) ) {
                    $attr['srcset'] = $srcset;

                    if ( empty( $attr['sizes'] ) ) {
                        $attr['sizes'] = $sizes;
                    }
                }
            }
        }

        /**
         * Filters the list of attachment image attributes.
         *
         * @since 2.8.0
         *
         * @param array        $attr       Attributes for the image markup.
         * @param WP_Post      $attachment Image attachment post.
         * @param string|array $size       Requested size. Image size or array of width and height values
         *                                 (in that order). Default 'thumbnail'.
         */
        $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size );
        $attr = array_map( 'esc_attr', $attr );
        $html = rtrim("<img $hwstring");
        foreach ( $attr as $name => $value ) {
            $html .= " $name=" . '"' . $value . '"';
        }
        $html .= ' />';
    }

    return $html;
}

/**
 * Get the URL of an image attachment.
 *
 * @since 4.4.0
 *
 * @param int          $attachment_id Image attachment ID.
 * @param string|array $size          Optional. Image size to retrieve. Accepts any valid image size, or an array
 *                                    of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
 * @return string|false Attachment URL or false if no image is available.
 */
function wp_get_attachment_image_url( $attachment_id, $size = 'thumbnail', $icon = false ) {
    $image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
    return isset( $image['0'] ) ? $image['0'] : false;
}

/**
 * Get the attachment path relative to the upload directory.
 *
 * @since 4.4.1
 * @access private
 *
 * @param string $file Attachment file name.
 * @return string Attachment path relative to the upload directory.
 */
function _wp_get_attachment_relative_path( $file ) {
    $dirname = dirname( $file );

    if ( '.' === $dirname ) {
        return '';
    }

    if ( false !== strpos( $dirname, 'wp-content/uploads' ) ) {
        // Get the directory name relative to the upload directory (back compat for pre-2.7 uploads)
        $dirname = substr( $dirname, strpos( $dirname, 'wp-content/uploads' ) + 18 );
        $dirname = ltrim( $dirname, '/' );
    }

    return $dirname;
}

/**
 * Get the image size as array from its meta data.
 *
 * Used for responsive images.
 *
 * @since 4.4.0
 * @access private
 *
 * @param string $size_name  Image size. Accepts any valid image size name ('thumbnail', 'medium', etc.).
 * @param array  $image_meta The image meta data.
 * @return array|bool Array of width and height values in pixels (in that order)
 *                    or false if the size doesn't exist.
 */
function _wp_get_image_size_from_meta( $size_name, $image_meta ) {
    if ( $size_name === 'full' ) {
        return array(
            absint( $image_meta['width'] ),
            absint( $image_meta['height'] ),
        );
    } elseif ( ! empty( $image_meta['sizes'][$size_name] ) ) {
        return array(
            absint( $image_meta['sizes'][$size_name]['width'] ),
            absint( $image_meta['sizes'][$size_name]['height'] ),
        );
    }

    return false;
}

/**
 * Retrieves the value for an image attachment's 'srcset' attribute.
 *
 * @since 4.4.0
 *
 * @see wp_calculate_image_srcset()
 *
 * @param int          $attachment_id Image attachment ID.
 * @param array|string $size          Optional. Image size. Accepts any valid image size, or an array of
 *                                    width and height values in pixels (in that order). Default 'medium'.
 * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
 *                                    Default null.
 * @return string|bool A 'srcset' value string or false.
 */
function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $image_meta = null ) {
    if ( ! $image = wp_get_attachment_image_src( $attachment_id, $size ) ) {
        return false;
    }

    if ( ! is_array( $image_meta ) ) {
        $image_meta = wp_get_attachment_metadata( $attachment_id );
    }

    $image_src = $image[0];
    $size_array = array(
        absint( $image[1] ),
        absint( $image[2] )
    );

    return wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
}

/**
 * A helper function to calculate the image sources to include in a 'srcset' attribute.
 *
 * @since 4.4.0
 *
 * @param array  $size_array    Array of width and height values in pixels (in that order).
 * @param string $image_src     The 'src' of the image.
 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
 * @param int    $attachment_id Optional. The image attachment ID to pass to the filter. Default 0.
 * @return string|bool          The 'srcset' attribute value. False on error or when only one source exists.
 */
function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id = 0 ) {
    /**
     * Let plugins pre-filter the image meta to be able to fix inconsistencies in the stored data.
     *
     * @since 4.5.0
     *
     * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
     * @param array  $size_array    Array of width and height values in pixels (in that order).
     * @param string $image_src     The 'src' of the image.
     * @param int    $attachment_id The image attachment ID or 0 if not supplied.
     */
    $image_meta = apply_filters( 'wp_calculate_image_srcset_meta', $image_meta, $size_array, $image_src, $attachment_id );

    if ( empty( $image_meta['sizes'] ) || ! isset( $image_meta['file'] ) || strlen( $image_meta['file'] ) < 4 ) {
        return false;
    }

    $image_sizes = $image_meta['sizes'];

    // Get the width and height of the image.
    $image_width = (int) $size_array[0];
    $image_height = (int) $size_array[1];

    // Bail early if error/no width.
    if ( $image_width < 1 ) {
        return false;
    }

    $image_basename = wp_basename( $image_meta['file'] );

    /*
     * WordPress flattens animated GIFs into one frame when generating intermediate sizes.
     * To avoid hiding animation in user content, if src is a full size GIF, a srcset attribute is not generated.
     * If src is an intermediate size GIF, the full size is excluded from srcset to keep a flattened GIF from becoming animated.
     */
    if ( ! isset( $image_sizes['thumbnail']['mime-type'] ) || 'image/gif' !== $image_sizes['thumbnail']['mime-type'] ) {
        $image_sizes[] = array(
            'width'  => $image_meta['width'],
            'height' => $image_meta['height'],
            'file'   => $image_basename,
        );
    } elseif ( strpos( $image_src, $image_meta['file'] ) ) {
        return false;
    }

    // Retrieve the uploads sub-directory from the full size image.
    $dirname = _wp_get_attachment_relative_path( $image_meta['file'] );

    if ( $dirname ) {
        $dirname = trailingslashit( $dirname );
    }

    $upload_dir = wp_get_upload_dir();
    $image_baseurl = trailingslashit( $upload_dir['baseurl'] ) . $dirname;

    /*
     * If currently on HTTPS, prefer HTTPS URLs when we know they're supported by the domain
     * (which is to say, when they share the domain name of the current request).
     */
    if ( is_ssl() && 'https' !== substr( $image_baseurl, 0, 5 ) && parse_url( $image_baseurl, PHP_URL_HOST ) === $_SERVER['HTTP_HOST'] ) {
        $image_baseurl = set_url_scheme( $image_baseurl, 'https' );
    }

    /*
     * Images that have been edited in WordPress after being uploaded will
     * contain a unique hash. Look for that hash and use it later to filter
     * out images that are leftovers from previous versions.
     */
    $image_edited = preg_match( '/-e[0-9]{13}/', wp_basename( $image_src ), $image_edit_hash );

    /**
     * Filters the maximum image width to be included in a 'srcset' attribute.
     *
     * @since 4.4.0
     *
     * @param int   $max_width  The maximum image width to be included in the 'srcset'. Default '1600'.
     * @param array $size_array Array of width and height values in pixels (in that order).
     */
    $max_srcset_image_width = apply_filters( 'max_srcset_image_width', 1600, $size_array );

    // Array to hold URL candidates.
    $sources = array();

    /**
     * To make sure the ID matches our image src, we will check to see if any sizes in our attachment
     * meta match our $image_src. If no matches are found we don't return a srcset to avoid serving
     * an incorrect image. See #35045.
     */
    $src_matched = false;

    /*
     * Loop through available images. Only use images that are resized
     * versions of the same edit.
     */
    foreach ( $image_sizes as $image ) {
        $is_src = false;

        // Check if image meta isn't corrupted.
        if ( ! is_array( $image ) ) {
            continue;
        }

        // If the file name is part of the `src`, we've confirmed a match.
        if ( ! $src_matched && false !== strpos( $image_src, $dirname . $image['file'] ) ) {
            $src_matched = $is_src = true;
        }

        // Filter out images that are from previous edits.
        if ( $image_edited && ! strpos( $image['file'], $image_edit_hash[0] ) ) {
            continue;
        }

        /*
         * Filters out images that are wider than '$max_srcset_image_width' unless
         * that file is in the 'src' attribute.
         */
        if ( $max_srcset_image_width && $image['width'] > $max_srcset_image_width && ! $is_src ) {
            continue;
        }

        // If the image dimensions are within 1px of the expected size, use it.
        if ( wp_image_matches_ratio( $image_width, $image_height, $image['width'], $image['height'] ) ) {
            // Add the URL, descriptor, and value to the sources array to be returned.
            $source = array(
                'url'        => $image_baseurl . $image['file'],
                'descriptor' => 'w',
                'value'      => $image['width'],
            );

            // The 'src' image has to be the first in the 'srcset', because of a bug in iOS8. See #35030.
            if ( $is_src ) {
                $sources = array( $image['width'] => $source ) + $sources;
            } else {
                $sources[ $image['width'] ] = $source;
            }
        }
    }

    /**
     * Filters an image's 'srcset' sources.
     *
     * @since 4.4.0
     *
     * @param array  $sources {
     *     One or more arrays of source data to include in the 'srcset'.
     *
     *     @type array $width {
     *         @type string $url        The URL of an image source.
     *         @type string $descriptor The descriptor type used in the image candidate string,
     *                                  either 'w' or 'x'.
     *         @type int    $value      The source width if paired with a 'w' descriptor, or a
     *                                  pixel density value if paired with an 'x' descriptor.
     *     }
     * }
     * @param array  $size_array    Array of width and height values in pixels (in that order).
     * @param string $image_src     The 'src' of the image.
     * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
     * @param int    $attachment_id Image attachment ID or 0.
     */
    $sources = apply_filters( 'wp_calculate_image_srcset', $sources, $size_array, $image_src, $image_meta, $attachment_id );

    // Only return a 'srcset' value if there is more than one source.
    if ( ! $src_matched || count( $sources ) < 2 ) {
        return false;
    }

    $srcset = '';

    foreach ( $sources as $source ) {
        $srcset .= str_replace( ' ', '%20', $source['url'] ) . ' ' . $source['value'] . $source['descriptor'] . ', ';
    }

    return rtrim( $srcset, ', ' );
}

/**
 * Retrieves the value for an image attachment's 'sizes' attribute.
 *
 * @since 4.4.0
 *
 * @see wp_calculate_image_sizes()
 *
 * @param int          $attachment_id Image attachment ID.
 * @param array|string $size          Optional. Image size. Accepts any valid image size, or an array of width
 *                                    and height values in pixels (in that order). Default 'medium'.
 * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
 *                                    Default null.
 * @return string|bool A valid source size value for use in a 'sizes' attribute or false.
 */
function wp_get_attachment_image_sizes( $attachment_id, $size = 'medium', $image_meta = null ) {
    if ( ! $image = wp_get_attachment_image_src( $attachment_id, $size ) ) {
        return false;
    }

    if ( ! is_array( $image_meta ) ) {
        $image_meta = wp_get_attachment_metadata( $attachment_id );
    }

    $image_src = $image[0];
    $size_array = array(
        absint( $image[1] ),
        absint( $image[2] )
    );

    return wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
}

/**
 * Creates a 'sizes' attribute value for an image.
 *
 * @since 4.4.0
 *
 * @param array|string $size          Image size to retrieve. Accepts any valid image size, or an array
 *                                    of width and height values in pixels (in that order). Default 'medium'.
 * @param string       $image_src     Optional. The URL to the image file. Default null.
 * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
 *                                    Default null.
 * @param int          $attachment_id Optional. Image attachment ID. Either `$image_meta` or `$attachment_id`
 *                                    is needed when using the image size name as argument for `$size`. Default 0.
 * @return string|bool A valid source size value for use in a 'sizes' attribute or false.
 */
function wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 ) {
    $width = 0;

    if ( is_array( $size ) ) {
        $width = absint( $size[0] );
    } elseif ( is_string( $size ) ) {
        if ( ! $image_meta && $attachment_id ) {
            $image_meta = wp_get_attachment_metadata( $attachment_id );
        }

        if ( is_array( $image_meta ) ) {
            $size_array = _wp_get_image_size_from_meta( $size, $image_meta );
            if ( $size_array ) {
                $width = absint( $size_array[0] );
            }
        }
    }

    if ( ! $width ) {
        return false;
    }

    // Setup the default 'sizes' attribute.
    $sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width );

    /**
     * Filters the output of 'wp_calculate_image_sizes()'.
     *
     * @since 4.4.0
     *
     * @param string       $sizes         A source size value for use in a 'sizes' attribute.
     * @param array|string $size          Requested size. Image size or array of width and height values
     *                                    in pixels (in that order).
     * @param string|null  $image_src     The URL to the image file or null.
     * @param array|null   $image_meta    The image meta data as returned by wp_get_attachment_metadata() or null.
     * @param int          $attachment_id Image attachment ID of the original image or 0.
     */
    return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id );
}

/**
 * Filters 'img' elements in post content to add 'srcset' and 'sizes' attributes.
 *
 * @since 4.4.0
 *
 * @see wp_image_add_srcset_and_sizes()
 *
 * @param string $content The raw post content to be filtered.
 * @return string Converted content with 'srcset' and 'sizes' attributes added to images.
 */
function wp_make_content_images_responsive( $content ) {
    if ( ! preg_match_all( '/<img [^>]+>/', $content, $matches ) ) {
        return $content;
    }

    $selected_images = $attachment_ids = array();

    foreach( $matches[0] as $image ) {
        if ( false === strpos( $image, ' srcset=' ) && preg_match( '/wp-image-([0-9]+)/i', $image, $class_id ) &&
            ( $attachment_id = absint( $class_id[1] ) ) ) {

            /*
             * If exactly the same image tag is used more than once, overwrite it.
             * All identical tags will be replaced later with 'str_replace()'.
             */
            $selected_images[ $image ] = $attachment_id;
            // Overwrite the ID when the same image is included more than once.
            $attachment_ids[ $attachment_id ] = true;
        }
    }

    if ( count( $attachment_ids ) > 1 ) {
        /*
         * Warm the object cache with post and meta information for all found
         * images to avoid making individual database calls.
         */
        _prime_post_caches( array_keys( $attachment_ids ), false, true );
    }

    foreach ( $selected_images as $image => $attachment_id ) {
        $image_meta = wp_get_attachment_metadata( $attachment_id );
        $content = str_replace( $image, wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ), $content );
    }

    return $content;
}

/**
 * Adds 'srcset' and 'sizes' attributes to an existing 'img' element.
 *
 * @since 4.4.0
 *
 * @see wp_calculate_image_srcset()
 * @see wp_calculate_image_sizes()
 *
 * @param string $image         An HTML 'img' element to be filtered.
 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
 * @param int    $attachment_id Image attachment ID.
 * @return string Converted 'img' element with 'srcset' and 'sizes' attributes added.
 */
function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
    // Ensure the image meta exists.
    if ( empty( $image_meta['sizes'] ) ) {
        return $image;
    }

    $image_src = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
    list( $image_src ) = explode( '?', $image_src );

    // Return early if we couldn't get the image source.
    if ( ! $image_src ) {
        return $image;
    }

    // Bail early if an image has been inserted and later edited.
    if ( preg_match( '/-e[0-9]{13}/', $image_meta['file'], $img_edit_hash ) &&
        strpos( wp_basename( $image_src ), $img_edit_hash[0] ) === false ) {

        return $image;
    }

    $width  = preg_match( '/ width="([0-9]+)"/',  $image, $match_width  ) ? (int) $match_width[1]  : 0;
    $height = preg_match( '/ height="([0-9]+)"/', $image, $match_height ) ? (int) $match_height[1] : 0;

    if ( ! $width || ! $height ) {
        /*
         * If attempts to parse the size value failed, attempt to use the image meta data to match
         * the image file name from 'src' against the available sizes for an attachment.
         */
        $image_filename = wp_basename( $image_src );

        if ( $image_filename === wp_basename( $image_meta['file'] ) ) {
            $width = (int) $image_meta['width'];
            $height = (int) $image_meta['height'];
        } else {
            foreach( $image_meta['sizes'] as $image_size_data ) {
                if ( $image_filename === $image_size_data['file'] ) {
                    $width = (int) $image_size_data['width'];
                    $height = (int) $image_size_data['height'];
                    break;
                }
            }
        }
    }

    if ( ! $width || ! $height ) {
        return $image;
    }

    $size_array = array( $width, $height );
    $srcset = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );

    if ( $srcset ) {
        // Check if there is already a 'sizes' attribute.
        $sizes = strpos( $image, ' sizes=' );

        if ( ! $sizes ) {
            $sizes = wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
        }
    }

    if ( $srcset && $sizes ) {
        // Format the 'srcset' and 'sizes' string and escape attributes.
        $attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );

        if ( is_string( $sizes ) ) {
            $attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );
        }

        // Add 'srcset' and 'sizes' attributes to the image markup.
        $image = preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
    }

    return $image;
}

/**
 * Adds a 'wp-post-image' class to post thumbnails. Internal use only.
 *
 * Uses the {@see 'begin_fetch_post_thumbnail_html'} and {@see 'end_fetch_post_thumbnail_html'}
 * action hooks to dynamically add/remove itself so as to only filter post thumbnails.
 *
 * @ignore
 * @since 2.9.0
 *
 * @param array $attr Thumbnail attributes including src, class, alt, title.
 * @return array Modified array of attributes including the new 'wp-post-image' class.
 */
function _wp_post_thumbnail_class_filter( $attr ) {
    $attr['class'] .= ' wp-post-image';
    return $attr;
}

/**
 * Adds '_wp_post_thumbnail_class_filter' callback to the 'wp_get_attachment_image_attributes'
 * filter hook. Internal use only.
 *
 * @ignore
 * @since 2.9.0
 *
 * @param array $attr Thumbnail attributes including src, class, alt, title.
 */
function _wp_post_thumbnail_class_filter_add( $attr ) {
    add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

/**
 * Removes the '_wp_post_thumbnail_class_filter' callback from the 'wp_get_attachment_image_attributes'
 * filter hook. Internal use only.
 *
 * @ignore
 * @since 2.9.0
 *
 * @param array $attr Thumbnail attributes including src, class, alt, title.
 */
function _wp_post_thumbnail_class_filter_remove( $attr ) {
    remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
}

add_shortcode('wp_caption', 'img_caption_shortcode');
add_shortcode('caption', 'img_caption_shortcode');

/**
 * Builds the Caption shortcode output.
 *
 * Allows a plugin to replace the content that would otherwise be returned. The
 * filter is {@see 'img_caption_shortcode'} and passes an empty string, the attr
 * parameter and the content parameter values.
 *
 * The supported attributes for the shortcode are 'id', 'align', 'width', and
 * 'caption'.
 *
 * @since 2.6.0
 *
 * @param array  $attr {
 *     Attributes of the caption shortcode.
 *
 *     @type string $id      ID of the div element for the caption.
 *     @type string $align   Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft',
 *                           'aligncenter', alignright', 'alignnone'.
 *     @type int    $width   The width of the caption, in pixels.
 *     @type string $caption The caption text.
 *     @type string $class   Additional class name(s) added to the caption container.
 * }
 * @param string $content Shortcode content.
 * @return string HTML content to display the caption.
 */
function img_caption_shortcode( $attr, $content = null ) {
    // New-style shortcode with the caption inside the shortcode with the link and image tags.
    if ( ! isset( $attr['caption'] ) ) {
        if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
            $content = $matches[1];
            $attr['caption'] = trim( $matches[2] );
        }
    } elseif ( strpos( $attr['caption'], '<' ) !== false ) {
        $attr['caption'] = wp_kses( $attr['caption'], 'post' );
    }

    /**
     * Filters the default caption shortcode output.
     *
     * If the filtered output isn't empty, it will be used instead of generating
     * the default caption template.
     *
     * @since 2.6.0
     *
     * @see img_caption_shortcode()
     *
     * @param string $output  The caption output. Default empty.
     * @param array  $attr    Attributes of the caption shortcode.
     * @param string $content The image element, possibly wrapped in a hyperlink.
     */
    $output = apply_filters( 'img_caption_shortcode', '', $attr, $content );
    if ( $output != '' )
        return $output;

    $atts = shortcode_atts( array(
        'id'      => '',
        'align'      => 'alignnone',
        'width'      => '',
        'caption' => '',
        'class'   => '',
    ), $attr, 'caption' );

    $atts['width'] = (int) $atts['width'];
    if ( $atts['width'] < 1 || empty( $atts['caption'] ) )
        return $content;

    if ( ! empty( $atts['id'] ) )
        $atts['id'] = 'id="' . esc_attr( sanitize_html_class( $atts['id'] ) ) . '" ';

    $class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );

    $html5 = current_theme_supports( 'html5', 'caption' );
    // HTML5 captions never added the extra 10px to the image width
    $width = $html5 ? $atts['width'] : ( 10 + $atts['width'] );

    /**
     * Filters the width of an image's caption.
     *
     * By default, the caption is 10 pixels greater than the width of the image,
     * to prevent post content from running up against a floated image.
     *
     * @since 3.7.0
     *
     * @see img_caption_shortcode()
     *
     * @param int    $width    Width of the caption in pixels. To remove this inline style,
     *                         return zero.
     * @param array  $atts     Attributes of the caption shortcode.
     * @param string $content  The image element, possibly wrapped in a hyperlink.
     */
    $caption_width = apply_filters( 'img_caption_shortcode_width', $width, $atts, $content );

    $style = '';
    if ( $caption_width ) {
        $style = 'style="max-width: ' . (int) $caption_width . 'px" ';
    }

    if ( $html5 ) {
        $html = '<figure ' . $atts['id'] . $style . 'class="' . esc_attr( $class ) . '">'
        . do_shortcode( $content ) . '<figcaption class="wp-caption-text">' . $atts['caption'] . '</figcaption></figure>';
    } else {
        $html = '<div ' . $atts['id'] . $style . 'class="' . esc_attr( $class ) . '">'
        . do_shortcode( $content ) . '<p class="wp-caption-text">' . $atts['caption'] . '</p></div>';
    }

    return $html;
}

add_shortcode('gallery', 'gallery_shortcode');

/**
 * Builds the Gallery shortcode output.
 *
 * This implements the functionality of the Gallery Shortcode for displaying
 * WordPress images on a post.
 *
 * @since 2.5.0
 *
 * @staticvar int $instance
 *
 * @param array $attr {
 *     Attributes of the gallery shortcode.
 *
 *     @type string       $order      Order of the images in the gallery. Default 'ASC'. Accepts 'ASC', 'DESC'.
 *     @type string       $orderby    The field to use when ordering the images. Default 'menu_order ID'.
 *                                    Accepts any valid SQL ORDERBY statement.
 *     @type int          $id         Post ID.
 *     @type string       $itemtag    HTML tag to use for each image in the gallery.
 *                                    Default 'dl', or 'figure' when the theme registers HTML5 gallery support.
 *     @type string       $icontag    HTML tag to use for each image's icon.
 *                                    Default 'dt', or 'div' when the theme registers HTML5 gallery support.
 *     @type string       $captiontag HTML tag to use for each image's caption.
 *                                    Default 'dd', or 'figcaption' when the theme registers HTML5 gallery support.
 *     @type int          $columns    Number of columns of images to display. Default 3.
 *     @type string|array $size       Size of the images to display. Accepts any valid image size, or an array of width
 *                                    and height values in pixels (in that order). Default 'thumbnail'.
 *     @type string       $ids        A comma-separated list of IDs of attachments to display. Default empty.
 *     @type string       $include    A comma-separated list of IDs of attachments to include. Default empty.
 *     @type string       $exclude    A comma-separated list of IDs of attachments to exclude. Default empty.
 *     @type string       $link       What to link each image to. Default empty (links to the attachment page).
 *                                    Accepts 'file', 'none'.
 * }
 * @return string HTML content to display gallery.
 */
function gallery_shortcode( $attr ) {
    $post = get_post();

    static $instance = 0;
    $instance++;

    if ( ! empty( $attr['ids'] ) ) {
        // 'ids' is explicitly ordered, unless you specify otherwise.
        if ( empty( $attr['orderby'] ) ) {
            $attr['orderby'] = 'post__in';
        }
        $attr['include'] = $attr['ids'];
    }

    /**
     * Filters the default gallery shortcode output.
     *
     * If the filtered output isn't empty, it will be used instead of generating
     * the default gallery template.
     *
     * @since 2.5.0
     * @since 4.2.0 The `$instance` parameter was added.
     *
     * @see gallery_shortcode()
     *
     * @param string $output   The gallery output. Default empty.
     * @param array  $attr     Attributes of the gallery shortcode.
     * @param int    $instance Unique numeric ID of this gallery shortcode instance.
     */
    $output = apply_filters( 'post_gallery', '', $attr, $instance );
    if ( $output != '' ) {
        return $output;
    }

    $html5 = current_theme_supports( 'html5', 'gallery' );
    $atts = shortcode_atts( array(
        'order'      => 'ASC',
        'orderby'    => 'menu_order ID',
        'id'         => $post ? $post->ID : 0,
        'itemtag'    => $html5 ? 'figure'     : 'dl',
        'icontag'    => $html5 ? 'div'        : 'dt',
        'captiontag' => $html5 ? 'figcaption' : 'dd',
        'columns'    => 3,
        'size'       => 'thumbnail',
        'include'    => '',
        'exclude'    => '',
        'link'       => ''
    ), $attr, 'gallery' );

    $id = intval( $atts['id'] );

    if ( ! empty( $atts['include'] ) ) {
        $_attachments = get_posts( array( 'include' => $atts['include'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );

        $attachments = array();
        foreach ( $_attachments as $key => $val ) {
            $attachments[$val->ID] = $_attachments[$key];
        }
    } elseif ( ! empty( $atts['exclude'] ) ) {
        $attachments = get_children( array( 'post_parent' => $id, 'exclude' => $atts['exclude'], 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
    } else {
        $attachments = get_children( array( 'post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $atts['order'], 'orderby' => $atts['orderby'] ) );
    }

    if ( empty( $attachments ) ) {
        return '';
    }

    if ( is_feed() ) {
        $output = "\n";
        foreach ( $attachments as $att_id => $attachment ) {
            $output .= wp_get_attachment_link( $att_id, $atts['size'], true ) . "\n";
        }
        return $output;
    }

    $itemtag = tag_escape( $atts['itemtag'] );
    $captiontag = tag_escape( $atts['captiontag'] );
    $icontag = tag_escape( $atts['icontag'] );
    $valid_tags = wp_kses_allowed_html( 'post' );
    if ( ! isset( $valid_tags[ $itemtag ] ) ) {
        $itemtag = 'dl';
    }
    if ( ! isset( $valid_tags[ $captiontag ] ) ) {
        $captiontag = 'dd';
    }
    if ( ! isset( $valid_tags[ $icontag ] ) ) {
        $icontag = 'dt';
    }

    $columns = intval( $atts['columns'] );
    $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
    $float = is_rtl() ? 'right' : 'left';

    $selector = "gallery-{$instance}";

    $gallery_style = '';

    /**
     * Filters whether to print default gallery styles.
     *
     * @since 3.1.0
     *
     * @param bool $print Whether to print default gallery styles.
     *                    Defaults to false if the theme supports HTML5 galleries.
     *                    Otherwise, defaults to true.
     */
    if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
        $gallery_style = "
        <style type='text/css'>
            #{$selector} {
                margin: auto;
            }
            #{$selector} .gallery-item {
                float: {$float};
                margin-top: 10px;
                text-align: center;
                width: {$itemwidth}%;
            }
            #{$selector} img {
                border: 2px solid #cfcfcf;
            }
            #{$selector} .gallery-caption {
                margin-left: 0;
            }
            /* see gallery_shortcode() in wp-includes/media.php */
        </style>\n\t\t";
    }

    $size_class = sanitize_html_class( $atts['size'] );
    $gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";

    /**
     * Filters the default gallery shortcode CSS styles.
     *
     * @since 2.5.0
     *
     * @param string $gallery_style Default CSS styles and opening HTML div container
     *                              for the gallery shortcode output.
     */
    $output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );

    $i = 0;
    foreach ( $attachments as $id => $attachment ) {

        $attr = ( trim( $attachment->post_excerpt ) ) ? array( 'aria-describedby' => "$selector-$id" ) : '';
        if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {
            $image_output = wp_get_attachment_link( $id, $atts['size'], false, false, false, $attr );
        } elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {
            $image_output = wp_get_attachment_image( $id, $atts['size'], false, $attr );
        } else {
            $image_output = wp_get_attachment_link( $id, $atts['size'], true, false, false, $attr );
        }
        $image_meta  = wp_get_attachment_metadata( $id );

        $orientation = '';
        if ( isset( $image_meta['height'], $image_meta['width'] ) ) {
            $orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
        }
        $output .= "<{$itemtag} class='gallery-item'>";
        $output .= "
            <{$icontag} class='gallery-icon {$orientation}'>
                $image_output
            </{$icontag}>";
        if ( $captiontag && trim($attachment->post_excerpt) ) {
            $output .= "
                <{$captiontag} class='wp-caption-text gallery-caption' id='$selector-$id'>
                " . wptexturize($attachment->post_excerpt) . "
                </{$captiontag}>";
        }
        $output .= "</{$itemtag}>";
        if ( ! $html5 && $columns > 0 && ++$i % $columns == 0 ) {
            $output .= '<br style="clear: both" />';
        }
    }

    if ( ! $html5 && $columns > 0 && $i % $columns !== 0 ) {
        $output .= "
            <br style='clear: both' />";
    }

    $output .= "
        </div>\n";

    return $output;
}

/**
 * Outputs the templates used by playlists.
 *
 * @since 3.9.0
 */
function wp_underscore_playlist_templates() {
?>
<script type="text/html" id="tmpl-wp-playlist-current-item">
    <# if ( data.image ) { #>
    <img src="{{ data.thumb.src }}" alt="" />
    <# } #>
    <div class="wp-playlist-caption">
        <span class="wp-playlist-item-meta wp-playlist-item-title"><?php
            /* translators: playlist item title */
            printf( _x( '“%s”', 'playlist item title' ), '{{ data.title }}' );
        ?></span>
        <# if ( data.meta.album ) { #><span class="wp-playlist-item-meta wp-playlist-item-album">{{ data.meta.album }}</span><# } #>
        <# if ( data.meta.artist ) { #><span class="wp-playlist-item-meta wp-playlist-item-artist">{{ data.meta.artist }}</span><# } #>
    </div>
</script>
<script type="text/html" id="tmpl-wp-playlist-item">
    <div class="wp-playlist-item">
        <a class="wp-playlist-caption" href="{{ data.src }}">
            {{ data.index ? ( data.index + '. ' ) : '' }}
            <# if ( data.caption ) { #>
                {{ data.caption }}
            <# } else { #>
                <span class="wp-playlist-item-title"><?php
                    /* translators: playlist item title */
                    printf( _x( '“%s”', 'playlist item title' ), '{{{ data.title }}}' );
                ?></span>
                <# if ( data.artists && data.meta.artist ) { #>
                <span class="wp-playlist-item-artist"> — {{ data.meta.artist }}</span>
                <# } #>
            <# } #>
        </a>
        <# if ( data.meta.length_formatted ) { #>
        <div class="wp-playlist-item-length">{{ data.meta.length_formatted }}</div>
        <# } #>
    </div>
</script>
<?php
}

/**
 * Outputs and enqueue default scripts and styles for playlists.
 *
 * @since 3.9.0
 *
 * @param string $type Type of playlist. Accepts 'audio' or 'video'.
 */
function wp_playlist_scripts( $type ) {
    wp_enqueue_style( 'wp-mediaelement' );
    wp_enqueue_script( 'wp-playlist' );
?>
<!--[if lt IE 9]><script>document.createElement('<?php echo esc_js( $type ) ?>');</script><![endif]-->
<?php
    add_action( 'wp_footer', 'wp_underscore_playlist_templates', 0 );
    add_action( 'admin_footer', 'wp_underscore_playlist_templates', 0 );
}

/**
 * Builds the Playlist shortcode output.
 *
 * This implements the functionality of the playlist shortcode for displaying
 * a collection of WordPress audio or video files in a post.
 *
 * @since 3.9.0
 *
 * @global int $content_width
 * @staticvar int $instance
 *
 * @param array $attr {
 *     Array of default playlist attributes.
 *
 *     @type string  $type         Type of playlist to display. Accepts 'audio' or 'video'. Default 'audio'.
 *     @type string  $order        Designates ascending or descending order of items in the playlist.
 *                                 Accepts 'ASC', 'DESC'. Default 'ASC'.
 *     @type string  $orderby      Any column, or columns, to sort the playlist. If $ids are
 *                                 passed, this defaults to the order of the $ids array ('post__in').
 *                                 Otherwise default is 'menu_order ID'.
 *     @type int     $id           If an explicit $ids array is not present, this parameter
 *                                 will determine which attachments are used for the playlist.
 *                                 Default is the current post ID.
 *     @type array   $ids          Create a playlist out of these explicit attachment IDs. If empty,
 *                                 a playlist will be created from all $type attachments of $id.
 *                                 Default empty.
 *     @type array   $exclude      List of specific attachment IDs to exclude from the playlist. Default empty.
 *     @type string  $style        Playlist style to use. Accepts 'light' or 'dark'. Default 'light'.
 *     @type bool    $tracklist    Whether to show or hide the playlist. Default true.
 *     @type bool    $tracknumbers Whether to show or hide the numbers next to entries in the playlist. Default true.
 *     @type bool    $images       Show or hide the video or audio thumbnail (Featured Image/post
 *                                 thumbnail). Default true.
 *     @type bool    $artists      Whether to show or hide artist name in the playlist. Default true.
 * }
 *
 * @return string Playlist output. Empty string if the passed type is unsupported.
 */
function wp_playlist_shortcode( $attr ) {
    global $content_width;
    $post = get_post();

    static $instance = 0;
    $instance++;

    if ( ! empty( $attr['ids'] ) ) {
        // 'ids' is explicitly ordered, unless you specify otherwise.
        if ( empty( $attr['orderby'] ) ) {
            $attr['orderby'] = 'post__in';
        }
        $attr['include'] = $attr['ids'];
    }

    /**
     * Filters the playlist output.
     *
     * Passing a non-empty value to the filter will short-circuit generation
     * of the default playlist output, returning the passed value instead.
     *
     * @since 3.9.0
     * @since 4.2.0 The `$instance` parameter was added.
     *
     * @param string $output   Playlist output. Default empty.
     * @param array  $attr     An array of shortcode attributes.
     * @param int    $instance Unique numeric ID of this playlist shortcode instance.
     */
    $output = apply_filters( 'post_playlist', '', $attr, $instance );
    if ( $output != '' ) {
        return $output;
    }

    $atts = shortcode_atts( array(
        'type'        => 'audio',
        'order'        => 'ASC',
        'orderby'    => 'menu_order ID',
        'id'        => $post ? $post->ID : 0,
        'include'    => '',
        'exclude'   => '',
        'style'        => 'light',
        'tracklist' => true,
        'tracknumbers' => true,
        'images'    => true,
        'artists'    => true
    ), $attr, 'playlist' );

    $id = intval( $atts['id'] );

    if ( $atts['type'] !== 'audio' ) {
        $atts['type'] = 'video';
    }

    $args = array(
        'post_status' => 'inherit',
        'post_type' => 'attachment',
        'post_mime_type' => $atts['type'],
        'order' => $atts['order'],
        'orderby' => $atts['orderby']
    );

    if ( ! empty( $atts['include'] ) ) {
        $args['include'] = $atts['include'];
        $_attachments = get_posts( $args );

        $attachments = array();
        foreach ( $_attachments as $key => $val ) {
            $attachments[$val->ID] = $_attachments[$key];
        }
    } elseif ( ! empty( $atts['exclude'] ) ) {
        $args['post_parent'] = $id;
        $args['exclude'] = $atts['exclude'];
        $attachments = get_children( $args );
    } else {
        $args['post_parent'] = $id;
        $attachments = get_children( $args );
    }

    if ( empty( $attachments ) ) {
        return '';
    }

    if ( is_feed() ) {
        $output = "\n";
        foreach ( $attachments as $att_id => $attachment ) {
            $output .= wp_get_attachment_link( $att_id ) . "\n";
        }
        return $output;
    }

    $outer = 22; // default padding and border of wrapper

    $default_width = 640;
    $default_height = 360;

    $theme_width = empty( $content_width ) ? $default_width : ( $content_width - $outer );
    $theme_height = empty( $content_width ) ? $default_height : round( ( $default_height * $theme_width ) / $default_width );

    $data = array(
        'type' => $atts['type'],
        // don't pass strings to JSON, will be truthy in JS
        'tracklist' => wp_validate_boolean( $atts['tracklist'] ),
        'tracknumbers' => wp_validate_boolean( $atts['tracknumbers'] ),
        'images' => wp_validate_boolean( $atts['images'] ),
        'artists' => wp_validate_boolean( $atts['artists'] ),
    );

    $tracks = array();
    foreach ( $attachments as $attachment ) {
        $url = wp_get_attachment_url( $attachment->ID );
        $ftype = wp_check_filetype( $url, wp_get_mime_types() );
        $track = array(
            'src' => $url,
            'type' => $ftype['type'],
            'title' => $attachment->post_title,
            'caption' => $attachment->post_excerpt,
            'description' => $attachment->post_content
        );

        $track['meta'] = array();
        $meta = wp_get_attachment_metadata( $attachment->ID );
        if ( ! empty( $meta ) ) {

            foreach ( wp_get_attachment_id3_keys( $attachment ) as $key => $label ) {
                if ( ! empty( $meta[ $key ] ) ) {
                    $track['meta'][ $key ] = $meta[ $key ];
                }
            }

            if ( 'video' === $atts['type'] ) {
                if ( ! empty( $meta['width'] ) && ! empty( $meta['height'] ) ) {
                    $width = $meta['width'];
                    $height = $meta['height'];
                    $theme_height = round( ( $height * $theme_width ) / $width );
                } else {
                    $width = $default_width;
                    $height = $default_height;
                }

                $track['dimensions'] = array(
                    'original' => compact( 'width', 'height' ),
                    'resized' => array(
                        'width' => $theme_width,
                        'height' => $theme_height
                    )
                );
            }
        }

        if ( $atts['images'] ) {
            $thumb_id = get_post_thumbnail_id( $attachment->ID );
            if ( ! empty( $thumb_id ) ) {
                list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'full' );
                $track['image'] = compact( 'src', 'width', 'height' );
                list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'thumbnail' );
                $track['thumb'] = compact( 'src', 'width', 'height' );
            } else {
                $src = wp_mime_type_icon( $attachment->ID );
                $width = 48;
                $height = 64;
                $track['image'] = compact( 'src', 'width', 'height' );
                $track['thumb'] = compact( 'src', 'width', 'height' );
            }
        }

        $tracks[] = $track;
    }
    $data['tracks'] = $tracks;

    $safe_type = esc_attr( $atts['type'] );
    $safe_style = esc_attr( $atts['style'] );

    ob_start();

    if ( 1 === $instance ) {
        /**
         * Prints and enqueues playlist scripts, styles, and JavaScript templates.
         *
         * @since 3.9.0
         *
         * @param string $type  Type of playlist. Possible values are 'audio' or 'video'.
         * @param string $style The 'theme' for the playlist. Core provides 'light' and 'dark'.
         */
        do_action( 'wp_playlist_scripts', $atts['type'], $atts['style'] );
    } ?>
<div class="wp-playlist wp-<?php echo $safe_type ?>-playlist wp-playlist-<?php echo $safe_style ?>">
    <?php if ( 'audio' === $atts['type'] ): ?>
    <div class="wp-playlist-current-item"></div>
    <?php endif ?>
    <<?php echo $safe_type ?> controls="controls" preload="none" width="<?php
        echo (int) $theme_width;
    ?>"<?php if ( 'video' === $safe_type ):
        echo ' height="', (int) $theme_height, '"';
    endif; ?>></<?php echo $safe_type ?>>
    <div class="wp-playlist-next"></div>
    <div class="wp-playlist-prev"></div>
    <noscript>
    <ol><?php
    foreach ( $attachments as $att_id => $attachment ) {
        printf( '<li>%s</li>', wp_get_attachment_link( $att_id ) );
    }
    ?></ol>
    </noscript>
    <script type="application/json" class="wp-playlist-script"><?php echo wp_json_encode( $data ) ?></script>
</div>
    <?php
    return ob_get_clean();
}
add_shortcode( 'playlist', 'wp_playlist_shortcode' );

/**
 * Provides a No-JS Flash fallback as a last resort for audio / video.
 *
 * @since 3.6.0
 *
 * @param string $url The media element URL.
 * @return string Fallback HTML.
 */
function wp_mediaelement_fallback( $url ) {
    /**
     * Filters the Mediaelement fallback output for no-JS.
     *
     * @since 3.6.0
     *
     * @param string $output Fallback output for no-JS.
     * @param string $url    Media file URL.
     */
    return apply_filters( 'wp_mediaelement_fallback', sprintf( '<a href="%1$s">%1$s</a>', esc_url( $url ) ), $url );
}

/**
 * Returns a filtered list of WP-supported audio formats.
 *
 * @since 3.6.0
 *
 * @return array Supported audio formats.
 */
function wp_get_audio_extensions() {
    /**
     * Filters the list of supported audio formats.
     *
     * @since 3.6.0
     *
     * @param array $extensions An array of support audio formats. Defaults are
     *                          'mp3', 'ogg', 'flac', 'm4a', 'wav'.
     */
    return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'flac', 'm4a', 'wav' ) );
}

/**
 * Returns useful keys to use to lookup data from an attachment's stored metadata.
 *
 * @since 3.9.0
 *
 * @param WP_Post $attachment The current attachment, provided for context.
 * @param string  $context    Optional. The context. Accepts 'edit', 'display'. Default 'display'.
 * @return array Key/value pairs of field keys to labels.
 */
function wp_get_attachment_id3_keys( $attachment, $context = 'display' ) {
    $fields = array(
        'artist' => __( 'Artist' ),
        'album' => __( 'Album' ),
    );

    if ( 'display' === $context ) {
        $fields['genre']            = __( 'Genre' );
        $fields['year']             = __( 'Year' );
        $fields['length_formatted'] = _x( 'Length', 'video or audio' );
    } elseif ( 'js' === $context ) {
        $fields['bitrate']          = __( 'Bitrate' );
        $fields['bitrate_mode']     = __( 'Bitrate Mode' );
    }

    /**
     * Filters the editable list of keys to look up data from an attachment's metadata.
     *
     * @since 3.9.0
     *
     * @param array   $fields     Key/value pairs of field keys to labels.
     * @param WP_Post $attachment Attachment object.
     * @param string  $context    The context. Accepts 'edit', 'display'. Default 'display'.
     */
    return apply_filters( 'wp_get_attachment_id3_keys', $fields, $attachment, $context );
}
/**
 * Builds the Audio shortcode output.
 *
 * This implements the functionality of the Audio Shortcode for displaying
 * WordPress mp3s in a post.
 *
 * @since 3.6.0
 *
 * @staticvar int $instance
 *
 * @param array  $attr {
 *     Attributes of the audio shortcode.
 *
 *     @type string $src      URL to the source of the audio file. Default empty.
 *     @type string $loop     The 'loop' attribute for the `<audio>` element. Default empty.
 *     @type string $autoplay The 'autoplay' attribute for the `<audio>` element. Default empty.
 *     @type string $preload  The 'preload' attribute for the `<audio>` element. Default 'none'.
 *     @type string $class    The 'class' attribute for the `<audio>` element. Default 'wp-audio-shortcode'.
 *     @type string $style    The 'style' attribute for the `<audio>` element. Default 'width: 100%;'.
 * }
 * @param string $content Shortcode content.
 * @return string|void HTML content to display audio.
 */
function wp_audio_shortcode( $attr, $content = '' ) {
    $post_id = get_post() ? get_the_ID() : 0;

    static $instance = 0;
    $instance++;

    /**
     * Filters the default audio shortcode output.
     *
     * If the filtered output isn't empty, it will be used instead of generating the default audio template.
     *
     * @since 3.6.0
     *
     * @param string $html     Empty variable to be replaced with shortcode markup.
     * @param array  $attr     Attributes of the shortcode. @see wp_audio_shortcode()
     * @param string $content  Shortcode content.
     * @param int    $instance Unique numeric ID of this audio shortcode instance.
     */
    $override = apply_filters( 'wp_audio_shortcode_override', '', $attr, $content, $instance );
    if ( '' !== $override ) {
        return $override;
    }

    $audio = null;

    $default_types = wp_get_audio_extensions();
    $defaults_atts = array(
        'src'      => '',
        'loop'     => '',
        'autoplay' => '',
        'preload'  => 'none',
        'class'    => 'wp-audio-shortcode',
        'style'    => 'width: 100%;'
    );
    foreach ( $default_types as $type ) {
        $defaults_atts[$type] = '';
    }

    $atts = shortcode_atts( $defaults_atts, $attr, 'audio' );

    $primary = false;
    if ( ! empty( $atts['src'] ) ) {
        $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
        if ( ! in_array( strtolower( $type['ext'] ), $default_types ) ) {
            return sprintf( '<a class="wp-embedded-audio" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
        }
        $primary = true;
        array_unshift( $default_types, 'src' );
    } else {
        foreach ( $default_types as $ext ) {
            if ( ! empty( $atts[ $ext ] ) ) {
                $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
                if ( strtolower( $type['ext'] ) === $ext ) {
                    $primary = true;
                }
            }
        }
    }

    if ( ! $primary ) {
        $audios = get_attached_media( 'audio', $post_id );
        if ( empty( $audios ) ) {
            return;
        }

        $audio = reset( $audios );
        $atts['src'] = wp_get_attachment_url( $audio->ID );
        if ( empty( $atts['src'] ) ) {
            return;
        }

        array_unshift( $default_types, 'src' );
    }

    /**
     * Filters the media library used for the audio shortcode.
     *
     * @since 3.6.0
     *
     * @param string $library Media library used for the audio shortcode.
     */
    $library = apply_filters( 'wp_audio_shortcode_library', 'mediaelement' );
    if ( 'mediaelement' === $library && did_action( 'init' ) ) {
        wp_enqueue_style( 'wp-mediaelement' );
        wp_enqueue_script( 'wp-mediaelement' );
    }

    /**
     * Filters the class attribute for the audio shortcode output container.
     *
     * @since 3.6.0
     * @since 4.9.0 The `$atts` parameter was added.
     *
     * @param string $class CSS class or list of space-separated classes.
     * @param array  $atts  Array of audio shortcode attributes.
     */
    $atts['class'] = apply_filters( 'wp_audio_shortcode_class', $atts['class'], $atts );

    $html_atts = array(
        'class'    => $atts['class'],
        'id'       => sprintf( 'audio-%d-%d', $post_id, $instance ),
        'loop'     => wp_validate_boolean( $atts['loop'] ),
        'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
        'preload'  => $atts['preload'],
        'style'    => $atts['style'],
    );

    // These ones should just be omitted altogether if they are blank
    foreach ( array( 'loop', 'autoplay', 'preload' ) as $a ) {
        if ( empty( $html_atts[$a] ) ) {
            unset( $html_atts[$a] );
        }
    }

    $attr_strings = array();
    foreach ( $html_atts as $k => $v ) {
        $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
    }

    $html = '';
    if ( 'mediaelement' === $library && 1 === $instance ) {
        $html .= "<!--[if lt IE 9]><script>document.createElement('audio');</script><![endif]-->\n";
    }
    $html .= sprintf( '<audio %s controls="controls">', join( ' ', $attr_strings ) );

    $fileurl = '';
    $source = '<source type="%s" src="%s" />';
    foreach ( $default_types as $fallback ) {
        if ( ! empty( $atts[ $fallback ] ) ) {
            if ( empty( $fileurl ) ) {
                $fileurl = $atts[ $fallback ];
            }
            $type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
            $url = add_query_arg( '_', $instance, $atts[ $fallback ] );
            $html .= sprintf( $source, $type['type'], esc_url( $url ) );
        }
    }

    if ( 'mediaelement' === $library ) {
        $html .= wp_mediaelement_fallback( $fileurl );
    }
    $html .= '</audio>';

    /**
     * Filters the audio shortcode output.
     *
     * @since 3.6.0
     *
     * @param string $html    Audio shortcode HTML output.
     * @param array  $atts    Array of audio shortcode attributes.
     * @param string $audio   Audio file.
     * @param int    $post_id Post ID.
     * @param string $library Media library used for the audio shortcode.
     */
    return apply_filters( 'wp_audio_shortcode', $html, $atts, $audio, $post_id, $library );
}
add_shortcode( 'audio', 'wp_audio_shortcode' );

/**
 * Returns a filtered list of WP-supported video formats.
 *
 * @since 3.6.0
 *
 * @return array List of supported video formats.
 */
function wp_get_video_extensions() {
    /**
     * Filters the list of supported video formats.
     *
     * @since 3.6.0
     *
     * @param array $extensions An array of support video formats. Defaults are
     *                          'mp4', 'm4v', 'webm', 'ogv', 'flv'.
     */
    return apply_filters( 'wp_video_extensions', array( 'mp4', 'm4v', 'webm', 'ogv', 'flv' ) );
}

/**
 * Builds the Video shortcode output.
 *
 * This implements the functionality of the Video Shortcode for displaying
 * WordPress mp4s in a post.
 *
 * @since 3.6.0
 *
 * @global int $content_width
 * @staticvar int $instance
 *
 * @param array  $attr {
 *     Attributes of the shortcode.
 *
 *     @type string $src      URL to the source of the video file. Default empty.
 *     @type int    $height   Height of the video embed in pixels. Default 360.
 *     @type int    $width    Width of the video embed in pixels. Default $content_width or 640.
 *     @type string $poster   The 'poster' attribute for the `<video>` element. Default empty.
 *     @type string $loop     The 'loop' attribute for the `<video>` element. Default empty.
 *     @type string $autoplay The 'autoplay' attribute for the `<video>` element. Default empty.
 *     @type string $preload  The 'preload' attribute for the `<video>` element.
 *                            Default 'metadata'.
 *     @type string $class    The 'class' attribute for the `<video>` element.
 *                            Default 'wp-video-shortcode'.
 * }
 * @param string $content Shortcode content.
 * @return string|void HTML content to display video.
 */
function wp_video_shortcode( $attr, $content = '' ) {
    global $content_width;
    $post_id = get_post() ? get_the_ID() : 0;

    static $instance = 0;
    $instance++;

    /**
     * Filters the default video shortcode output.
     *
     * If the filtered output isn't empty, it will be used instead of generating
     * the default video template.
     *
     * @since 3.6.0
     *
     * @see wp_video_shortcode()
     *
     * @param string $html     Empty variable to be replaced with shortcode markup.
     * @param array  $attr     Attributes of the shortcode. @see wp_video_shortcode()
     * @param string $content  Video shortcode content.
     * @param int    $instance Unique numeric ID of this video shortcode instance.
     */
    $override = apply_filters( 'wp_video_shortcode_override', '', $attr, $content, $instance );
    if ( '' !== $override ) {
        return $override;
    }

    $video = null;

    $default_types = wp_get_video_extensions();
    $defaults_atts = array(
        'src'      => '',
        'poster'   => '',
        'loop'     => '',
        'autoplay' => '',
        'preload'  => 'metadata',
        'width'    => 640,
        'height'   => 360,
        'class'    => 'wp-video-shortcode',
    );

    foreach ( $default_types as $type ) {
        $defaults_atts[$type] = '';
    }

    $atts = shortcode_atts( $defaults_atts, $attr, 'video' );

    if ( is_admin() ) {
        // shrink the video so it isn't huge in the admin
        if ( $atts['width'] > $defaults_atts['width'] ) {
            $atts['height'] = round( ( $atts['height'] * $defaults_atts['width'] ) / $atts['width'] );
            $atts['width'] = $defaults_atts['width'];
        }
    } else {
        // if the video is bigger than the theme
        if ( ! empty( $content_width ) && $atts['width'] > $content_width ) {
            $atts['height'] = round( ( $atts['height'] * $content_width ) / $atts['width'] );
            $atts['width'] = $content_width;
        }
    }

    $is_vimeo = $is_youtube = false;
    $yt_pattern = '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#';
    $vimeo_pattern = '#^https?://(.+\.)?vimeo\.com/.*#';

    $primary = false;
    if ( ! empty( $atts['src'] ) ) {
        $is_vimeo = ( preg_match( $vimeo_pattern, $atts['src'] ) );
        $is_youtube = (  preg_match( $yt_pattern, $atts['src'] ) );
        if ( ! $is_youtube && ! $is_vimeo ) {
            $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
            if ( ! in_array( strtolower( $type['ext'] ), $default_types ) ) {
                return sprintf( '<a class="wp-embedded-video" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
            }
        }

        if ( $is_vimeo ) {
            wp_enqueue_script( 'mediaelement-vimeo' );
        }

        $primary = true;
        array_unshift( $default_types, 'src' );
    } else {
        foreach ( $default_types as $ext ) {
            if ( ! empty( $atts[ $ext ] ) ) {
                $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
                if ( strtolower( $type['ext'] ) === $ext ) {
                    $primary = true;
                }
            }
        }
    }

    if ( ! $primary ) {
        $videos = get_attached_media( 'video', $post_id );
        if ( empty( $videos ) ) {
            return;
        }

        $video = reset( $videos );
        $atts['src'] = wp_get_attachment_url( $video->ID );
        if ( empty( $atts['src'] ) ) {
            return;
        }

        array_unshift( $default_types, 'src' );
    }

    /**
     * Filters the media library used for the video shortcode.
     *
     * @since 3.6.0
     *
     * @param string $library Media library used for the video shortcode.
     */
    $library = apply_filters( 'wp_video_shortcode_library', 'mediaelement' );
    if ( 'mediaelement' === $library && did_action( 'init' ) ) {
        wp_enqueue_style( 'wp-mediaelement' );
        wp_enqueue_script( 'wp-mediaelement' );
        wp_enqueue_script( 'mediaelement-vimeo' );
    }

    // Mediaelement has issues with some URL formats for Vimeo and YouTube, so
    // update the URL to prevent the ME.js player from breaking.
    if ( 'mediaelement' === $library ) {
        if ( $is_youtube ) {
            // Remove `feature` query arg and force SSL - see #40866.
            $atts['src'] = remove_query_arg( 'feature', $atts['src'] );
            $atts['src'] = set_url_scheme( $atts['src'], 'https' );
        } elseif ( $is_vimeo ) {
            // Remove all query arguments and force SSL - see #40866.
            $parsed_vimeo_url = wp_parse_url( $atts['src'] );
            $vimeo_src = 'https://' . $parsed_vimeo_url['host'] . $parsed_vimeo_url['path'];

            // Add loop param for mejs bug - see #40977, not needed after #39686.
            $loop = $atts['loop'] ? '1' : '0';
            $atts['src'] = add_query_arg( 'loop', $loop, $vimeo_src );
        }
    }

    /**
     * Filters the class attribute for the video shortcode output container.
     *
     * @since 3.6.0
     * @since 4.9.0 The `$atts` parameter was added.
     *
     * @param string $class CSS class or list of space-separated classes.
     * @param array  $atts  Array of video shortcode attributes.
     */
    $atts['class'] = apply_filters( 'wp_video_shortcode_class', $atts['class'], $atts );

    $html_atts = array(
        'class'    => $atts['class'],
        'id'       => sprintf( 'video-%d-%d', $post_id, $instance ),
        'width'    => absint( $atts['width'] ),
        'height'   => absint( $atts['height'] ),
        'poster'   => esc_url( $atts['poster'] ),
        'loop'     => wp_validate_boolean( $atts['loop'] ),
        'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
        'preload'  => $atts['preload'],
    );

    // These ones should just be omitted altogether if they are blank
    foreach ( array( 'poster', 'loop', 'autoplay', 'preload' ) as $a ) {
        if ( empty( $html_atts[$a] ) ) {
            unset( $html_atts[$a] );
        }
    }

    $attr_strings = array();
    foreach ( $html_atts as $k => $v ) {
        $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
    }

    $html = '';
    if ( 'mediaelement' === $library && 1 === $instance ) {
        $html .= "<!--[if lt IE 9]><script>document.createElement('video');</script><![endif]-->\n";
    }
    $html .= sprintf( '<video %s controls="controls">', join( ' ', $attr_strings ) );

    $fileurl = '';
    $source = '<source type="%s" src="%s" />';
    foreach ( $default_types as $fallback ) {
        if ( ! empty( $atts[ $fallback ] ) ) {
            if ( empty( $fileurl ) ) {
                $fileurl = $atts[ $fallback ];
            }
            if ( 'src' === $fallback && $is_youtube ) {
                $type = array( 'type' => 'video/youtube' );
            } elseif ( 'src' === $fallback && $is_vimeo ) {
                $type = array( 'type' => 'video/vimeo' );
            } else {
                $type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
            }
            $url = add_query_arg( '_', $instance, $atts[ $fallback ] );
            $html .= sprintf( $source, $type['type'], esc_url( $url ) );
        }
    }

    if ( ! empty( $content ) ) {
        if ( false !== strpos( $content, "\n" ) ) {
            $content = str_replace( array( "\r\n", "\n", "\t" ), '', $content );
        }
        $html .= trim( $content );
    }

    if ( 'mediaelement' === $library ) {
        $html .= wp_mediaelement_fallback( $fileurl );
    }
    $html .= '</video>';

    $width_rule = '';
    if ( ! empty( $atts['width'] ) ) {
        $width_rule = sprintf( 'width: %dpx;', $atts['width'] );
    }
    $output = sprintf( '<div style="%s" class="wp-video">%s</div>', $width_rule, $html );

    /**
     * Filters the output of the video shortcode.
     *
     * @since 3.6.0
     *
     * @param string $output  Video shortcode HTML output.
     * @param array  $atts    Array of video shortcode attributes.
     * @param string $video   Video file.
     * @param int    $post_id Post ID.
     * @param string $library Media library used for the video shortcode.
     */
    return apply_filters( 'wp_video_shortcode', $output, $atts, $video, $post_id, $library );
}
add_shortcode( 'video', 'wp_video_shortcode' );

/**
 * Displays previous image link that has the same post parent.
 *
 * @since 2.5.0
 *
 * @see adjacent_image_link()
 *
 * @param string|array $size Optional. Image size. Accepts any valid image size, an array of width and
 *                           height values in pixels (in that order), 0, or 'none'. 0 or 'none' will
 *                           default to 'post_title' or `$text`. Default 'thumbnail'.
 * @param string       $text Optional. Link text. Default false.
 */
function previous_image_link( $size = 'thumbnail', $text = false ) {
    adjacent_image_link(true, $size, $text);
}

/**
 * Displays next image link that has the same post parent.
 *
 * @since 2.5.0
 *
 * @see adjacent_image_link()
 *
 * @param string|array $size Optional. Image size. Accepts any valid image size, an array of width and
 *                           height values in pixels (in that order), 0, or 'none'. 0 or 'none' will
 *                           default to 'post_title' or `$text`. Default 'thumbnail'.
 * @param string       $text Optional. Link text. Default false.
 */
function next_image_link( $size = 'thumbnail', $text = false ) {
    adjacent_image_link(false, $size, $text);
}

/**
 * Displays next or previous image link that has the same post parent.
 *
 * Retrieves the current attachment object from the $post global.
 *
 * @since 2.5.0
 *
 * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
 * @param string|array $size Optional. Image size. Accepts any valid image size, or an array of width and height
 *                           values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $text Optional. Link text. Default false.
 */
function adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
    $post = get_post();
    $attachments = array_values( get_children( array( 'post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID' ) ) );

    foreach ( $attachments as $k => $attachment ) {
        if ( $attachment->ID == $post->ID ) {
            break;
        }
    }

    $output = '';
    $attachment_id = 0;

    if ( $attachments ) {
        $k = $prev ? $k - 1 : $k + 1;

        if ( isset( $attachments[ $k ] ) ) {
            $attachment_id = $attachments[ $k ]->ID;
            $output = wp_get_attachment_link( $attachment_id, $size, true, false, $text );
        }
    }

    $adjacent = $prev ? 'previous' : 'next';

    /**
     * Filters the adjacent image link.
     *
     * The dynamic portion of the hook name, `$adjacent`, refers to the type of adjacency,
     * either 'next', or 'previous'.
     *
     * @since 3.5.0
     *
     * @param string $output        Adjacent image HTML markup.
     * @param int    $attachment_id Attachment ID
     * @param string $size          Image size.
     * @param string $text          Link text.
     */
    echo apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text );
}

/**
 * Retrieves taxonomies attached to given the attachment.
 *
 * @since 2.5.0
 * @since 4.7.0 Introduced the `$output` parameter.
 *
 * @param int|array|object $attachment Attachment ID, data array, or data object.
 * @param string           $output     Output type. 'names' to return an array of taxonomy names,
 *                                     or 'objects' to return an array of taxonomy objects.
 *                                     Default is 'names'.
 * @return array Empty array on failure. List of taxonomies on success.
 */
function get_attachment_taxonomies( $attachment, $output = 'names' ) {
    if ( is_int( $attachment ) ) {
        $attachment = get_post( $attachment );
    } elseif ( is_array( $attachment ) ) {
        $attachment = (object) $attachment;
    }
    if ( ! is_object($attachment) )
        return array();

    $file = get_attached_file( $attachment->ID );
    $filename = basename( $file );

    $objects = array('attachment');

    if ( false !== strpos($filename, '.') )
        $objects[] = 'attachment:' . substr($filename, strrpos($filename, '.') + 1);
    if ( !empty($attachment->post_mime_type) ) {
        $objects[] = 'attachment:' . $attachment->post_mime_type;
        if ( false !== strpos($attachment->post_mime_type, '/') )
            foreach ( explode('/', $attachment->post_mime_type) as $token )
                if ( !empty($token) )
                    $objects[] = "attachment:$token";
    }

    $taxonomies = array();
    foreach ( $objects as $object ) {
        if ( $taxes = get_object_taxonomies( $object, $output ) ) {
            $taxonomies = array_merge( $taxonomies, $taxes );
        }
    }

    if ( 'names' === $output ) {
        $taxonomies = array_unique( $taxonomies );
    }

    return $taxonomies;
}

/**
 * Retrieves all of the taxonomy names that are registered for attachments.
 *
 * Handles mime-type-specific taxonomies such as attachment:image and attachment:video.
 *
 * @since 3.5.0
 *
 * @see get_taxonomies()
 *
 * @param string $output Optional. The type of taxonomy output to return. Accepts 'names' or 'objects'.
 *                       Default 'names'.
 * @return array The names of all taxonomy of $object_type.
 */
function get_taxonomies_for_attachments( $output = 'names' ) {
    $taxonomies = array();
    foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy ) {
        foreach ( $taxonomy->object_type as $object_type ) {
            if ( 'attachment' == $object_type || 0 === strpos( $object_type, 'attachment:' ) ) {
                if ( 'names' == $output )
                    $taxonomies[] = $taxonomy->name;
                else
                    $taxonomies[ $taxonomy->name ] = $taxonomy;
                break;
            }
        }
    }

    return $taxonomies;
}

/**
 * Create new GD image resource with transparency support
 *
 * @todo: Deprecate if possible.
 *
 * @since 2.9.0
 *
 * @param int $width  Image width in pixels.
 * @param int $height Image height in pixels..
 * @return resource The GD image resource.
 */
function wp_imagecreatetruecolor($width, $height) {
    $img = imagecreatetruecolor($width, $height);
    if ( is_resource($img) && function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
        imagealphablending($img, false);
        imagesavealpha($img, true);
    }
    return $img;
}

/**
 * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.
 *
 * @since 2.9.0
 *
 * @see wp_constrain_dimensions()
 *
 * @param int $example_width  The width of an example embed.
 * @param int $example_height The height of an example embed.
 * @param int $max_width      The maximum allowed width.
 * @param int $max_height     The maximum allowed height.
 * @return array The maximum possible width and height based on the example ratio.
 */
function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
    $example_width  = (int) $example_width;
    $example_height = (int) $example_height;
    $max_width      = (int) $max_width;
    $max_height     = (int) $max_height;

    return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
}

/**
 * Determines the maximum upload size allowed in php.ini.
 *
 * @since 2.5.0
 *
 * @return int Allowed upload size.
 */
function wp_max_upload_size() {
    $u_bytes = wp_convert_hr_to_bytes( ini_get( 'upload_max_filesize' ) );
    $p_bytes = wp_convert_hr_to_bytes( ini_get( 'post_max_size' ) );

    /**
     * Filters the maximum upload size allowed in php.ini.
     *
     * @since 2.5.0
     *
     * @param int $size    Max upload size limit in bytes.
     * @param int $u_bytes Maximum upload filesize in bytes.
     * @param int $p_bytes Maximum size of POST data in bytes.
     */
    return apply_filters( 'upload_size_limit', min( $u_bytes, $p_bytes ), $u_bytes, $p_bytes );
}

/**
 * Returns a WP_Image_Editor instance and loads file into it.
 *
 * @since 3.5.0
 *
 * @param string $path Path to the file to load.
 * @param array  $args Optional. Additional arguments for retrieving the image editor.
 *                     Default empty array.
 * @return WP_Image_Editor|WP_Error The WP_Image_Editor object if successful, an WP_Error
 *                                  object otherwise.
 */
function wp_get_image_editor( $path, $args = array() ) {
    $args['path'] = $path;

    if ( ! isset( $args['mime_type'] ) ) {
        $file_info = wp_check_filetype( $args['path'] );

        // If $file_info['type'] is false, then we let the editor attempt to
        // figure out the file type, rather than forcing a failure based on extension.
        if ( isset( $file_info ) && $file_info['type'] )
            $args['mime_type'] = $file_info['type'];
    }

    $implementation = _wp_image_editor_choose( $args );

    if ( $implementation ) {
        $editor = new $implementation( $path );
        $loaded = $editor->load();

        if ( is_wp_error( $loaded ) )
            return $loaded;

        return $editor;
    }

    return new WP_Error( 'image_no_editor', __('No editor could be selected.') );
}

/**
 * Tests whether there is an editor that supports a given mime type or methods.
 *
 * @since 3.5.0
 *
 * @param string|array $args Optional. Array of arguments to retrieve the image editor supports.
 *                           Default empty array.
 * @return bool True if an eligible editor is found; false otherwise.
 */
function wp_image_editor_supports( $args = array() ) {
    return (bool) _wp_image_editor_choose( $args );
}

/**
 * Tests which editors are capable of supporting the request.
 *
 * @ignore
 * @since 3.5.0
 *
 * @param array $args Optional. Array of arguments for choosing a capable editor. Default empty array.
 * @return string|false Class name for the first editor that claims to support the request. False if no
 *                     editor claims to support the request.
 */
function _wp_image_editor_choose( $args = array() ) {
    require_once ABSPATH . WPINC . '/class-wp-image-editor.php';
    require_once ABSPATH . WPINC . '/class-wp-image-editor-gd.php';
    require_once ABSPATH . WPINC . '/class-wp-image-editor-imagick.php';
    /**
     * Filters the list of image editing library classes.
     *
     * @since 3.5.0
     *
     * @param array $image_editors List of available image editors. Defaults are
     *                             'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'.
     */
    $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) );

    foreach ( $implementations as $implementation ) {
        if ( ! call_user_func( array( $implementation, 'test' ), $args ) )
            continue;

        if ( isset( $args['mime_type'] ) &&
            ! call_user_func(
                array( $implementation, 'supports_mime_type' ),
                $args['mime_type'] ) ) {
            continue;
        }

        if ( isset( $args['methods'] ) &&
             array_diff( $args['methods'], get_class_methods( $implementation ) ) ) {
            continue;
        }

        return $implementation;
    }

    return false;
}

/**
 * Prints default Plupload arguments.
 *
 * @since 3.4.0
 */
function wp_plupload_default_settings() {
    $wp_scripts = wp_scripts();

    $data = $wp_scripts->get_data( 'wp-plupload', 'data' );
    if ( $data && false !== strpos( $data, '_wpPluploadSettings' ) )
        return;

    $max_upload_size = wp_max_upload_size();
    $allowed_extensions = array_keys( get_allowed_mime_types() );
    $extensions = array();
    foreach ( $allowed_extensions as $extension ) {
        $extensions = array_merge( $extensions, explode( '|', $extension ) );
    }

    /*
     * Since 4.9 the `runtimes` setting is hardcoded in our version of Plupload to `html5,html4`,
     * and the `flash_swf_url` and `silverlight_xap_url` are not used.
     */
    $defaults = array(
        'file_data_name'      => 'async-upload', // key passed to $_FILE.
        'url'                 => admin_url( 'async-upload.php', 'relative' ),
        'filters' => array(
            'max_file_size'   => $max_upload_size . 'b',
            'mime_types'      => array( array( 'extensions' => implode( ',', $extensions ) ) ),
        ),
    );

    // Currently only iOS Safari supports multiple files uploading but iOS 7.x has a bug that prevents uploading of videos
    // when enabled. See #29602.
    if ( wp_is_mobile() && strpos( $_SERVER['HTTP_USER_AGENT'], 'OS 7_' ) !== false &&
        strpos( $_SERVER['HTTP_USER_AGENT'], 'like Mac OS X' ) !== false ) {

        $defaults['multi_selection'] = false;
    }

    /**
     * Filters the Plupload default settings.
     *
     * @since 3.4.0
     *
     * @param array $defaults Default Plupload settings array.
     */
    $defaults = apply_filters( 'plupload_default_settings', $defaults );

    $params = array(
        'action' => 'upload-attachment',
    );

    /**
     * Filters the Plupload default parameters.
     *
     * @since 3.4.0
     *
     * @param array $params Default Plupload parameters array.
     */
    $params = apply_filters( 'plupload_default_params', $params );
    $params['_wpnonce'] = wp_create_nonce( 'media-form' );
    $defaults['multipart_params'] = $params;

    $settings = array(
        'defaults' => $defaults,
        'browser'  => array(
            'mobile'    => wp_is_mobile(),
            'supported' => _device_can_upload(),
        ),
        'limitExceeded' => is_multisite() && ! is_upload_space_available()
    );

    $script = 'var _wpPluploadSettings = ' . wp_json_encode( $settings ) . ';';

    if ( $data )
        $script = "$data\n$script";

    $wp_scripts->add_data( 'wp-plupload', 'data', $script );
}

/**
 * Prepares an attachment post object for JS, where it is expected
 * to be JSON-encoded and fit into an Attachment model.
 *
 * @since 3.5.0
 *
 * @param mixed $attachment Attachment ID or object.
 * @return array|void Array of attachment details.
 */
function wp_prepare_attachment_for_js( $attachment ) {
    if ( ! $attachment = get_post( $attachment ) )
        return;

    if ( 'attachment' != $attachment->post_type )
        return;

    $meta = wp_get_attachment_metadata( $attachment->ID );
    if ( false !== strpos( $attachment->post_mime_type, '/' ) )
        list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
    else
        list( $type, $subtype ) = array( $attachment->post_mime_type, '' );

    $attachment_url = wp_get_attachment_url( $attachment->ID );
    $base_url = str_replace( wp_basename( $attachment_url ), '', $attachment_url );

    $response = array(
        'id'          => $attachment->ID,
        'title'       => $attachment->post_title,
        'filename'    => wp_basename( get_attached_file( $attachment->ID ) ),
        'url'         => $attachment_url,
        'link'        => get_attachment_link( $attachment->ID ),
        'alt'         => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
        'author'      => $attachment->post_author,
        'description' => $attachment->post_content,
        'caption'     => $attachment->post_excerpt,
        'name'        => $attachment->post_name,
        'status'      => $attachment->post_status,
        'uploadedTo'  => $attachment->post_parent,
        'date'        => strtotime( $attachment->post_date_gmt ) * 1000,
        'modified'    => strtotime( $attachment->post_modified_gmt ) * 1000,
        'menuOrder'   => $attachment->menu_order,
        'mime'        => $attachment->post_mime_type,
        'type'        => $type,
        'subtype'     => $subtype,
        'icon'        => wp_mime_type_icon( $attachment->ID ),
        'dateFormatted' => mysql2date( __( 'F j, Y' ), $attachment->post_date ),
        'nonces'      => array(
            'update' => false,
            'delete' => false,
            'edit'   => false
        ),
        'editLink'   => false,
        'meta'       => false,
    );

    $author = new WP_User( $attachment->post_author );
    if ( $author->exists() ) {
        $response['authorName'] = html_entity_decode( $author->display_name, ENT_QUOTES, get_bloginfo( 'charset' ) );
    } else {
        $response['authorName'] = __( '(no author)' );
    }

    if ( $attachment->post_parent ) {
        $post_parent = get_post( $attachment->post_parent );
    } else {
        $post_parent = false;
    }

    if ( $post_parent ) {
        $parent_type = get_post_type_object( $post_parent->post_type );

        if ( $parent_type && $parent_type->show_ui && current_user_can( 'edit_post', $attachment->post_parent ) ) {
            $response['uploadedToLink'] = get_edit_post_link( $attachment->post_parent, 'raw' );
        }

        if ( $parent_type && current_user_can( 'read_post', $attachment->post_parent ) ) {
            $response['uploadedToTitle'] = $post_parent->post_title ? $post_parent->post_title : __( '(no title)' );
        }
    }

    $attached_file = get_attached_file( $attachment->ID );

    if ( isset( $meta['filesize'] ) ) {
        $bytes = $meta['filesize'];
    } elseif ( file_exists( $attached_file ) ) {
        $bytes = filesize( $attached_file );
    } else {
        $bytes = '';
    }

    if ( $bytes ) {
        $response['filesizeInBytes'] = $bytes;
        $response['filesizeHumanReadable'] = size_format( $bytes );
    }

    $context = get_post_meta( $attachment->ID, '_wp_attachment_context', true );
    $response['context'] = ( $context ) ? $context : '';

    if ( current_user_can( 'edit_post', $attachment->ID ) ) {
        $response['nonces']['update'] = wp_create_nonce( 'update-post_' . $attachment->ID );
        $response['nonces']['edit'] = wp_create_nonce( 'image_editor-' . $attachment->ID );
        $response['editLink'] = get_edit_post_link( $attachment->ID, 'raw' );
    }

    if ( current_user_can( 'delete_post', $attachment->ID ) )
        $response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID );

    if ( $meta && ( 'image' === $type || ! empty( $meta['sizes'] ) ) ) {
        $sizes = array();

        /** This filter is documented in wp-admin/includes/media.php */
        $possible_sizes = apply_filters( 'image_size_names_choose', array(
            'thumbnail' => __('Thumbnail'),
            'medium'    => __('Medium'),
            'large'     => __('Large'),
            'full'      => __('Full Size'),
        ) );
        unset( $possible_sizes['full'] );

        // Loop through all potential sizes that may be chosen. Try to do this with some efficiency.
        // First: run the image_downsize filter. If it returns something, we can use its data.
        // If the filter does not return something, then image_downsize() is just an expensive
        // way to check the image metadata, which we do second.
        foreach ( $possible_sizes as $size => $label ) {

            /** This filter is documented in wp-includes/media.php */
            if ( $downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size ) ) {
                if ( empty( $downsize[3] ) ) {
                    continue;
                }

                $sizes[ $size ] = array(
                    'height'      => $downsize[2],
                    'width'       => $downsize[1],
                    'url'         => $downsize[0],
                    'orientation' => $downsize[2] > $downsize[1] ? 'portrait' : 'landscape',
                );
            } elseif ( isset( $meta['sizes'][ $size ] ) ) {
                // Nothing from the filter, so consult image metadata if we have it.
                $size_meta = $meta['sizes'][ $size ];

                // We have the actual image size, but might need to further constrain it if content_width is narrower.
                // Thumbnail, medium, and full sizes are also checked against the site's height/width options.
                list( $width, $height ) = image_constrain_size_for_editor( $size_meta['width'], $size_meta['height'], $size, 'edit' );

                $sizes[ $size ] = array(
                    'height'      => $height,
                    'width'       => $width,
                    'url'         => $base_url . $size_meta['file'],
                    'orientation' => $height > $width ? 'portrait' : 'landscape',
                );
            }
        }

        if ( 'image' === $type ) {
            $sizes['full'] = array( 'url' => $attachment_url );

            if ( isset( $meta['height'], $meta['width'] ) ) {
                $sizes['full']['height'] = $meta['height'];
                $sizes['full']['width'] = $meta['width'];
                $sizes['full']['orientation'] = $meta['height'] > $meta['width'] ? 'portrait' : 'landscape';
            }

            $response = array_merge( $response, $sizes['full'] );
        } elseif ( $meta['sizes']['full']['file'] ) {
            $sizes['full'] = array(
                'url'         => $base_url . $meta['sizes']['full']['file'],
                'height'      => $meta['sizes']['full']['height'],
                'width'       => $meta['sizes']['full']['width'],
                'orientation' => $meta['sizes']['full']['height'] > $meta['sizes']['full']['width'] ? 'portrait' : 'landscape'
            );
        }

        $response = array_merge( $response, array( 'sizes' => $sizes ) );
    }

    if ( $meta && 'video' === $type ) {
        if ( isset( $meta['width'] ) )
            $response['width'] = (int) $meta['width'];
        if ( isset( $meta['height'] ) )
            $response['height'] = (int) $meta['height'];
    }

    if ( $meta && ( 'audio' === $type || 'video' === $type ) ) {
        if ( isset( $meta['length_formatted'] ) )
            $response['fileLength'] = $meta['length_formatted'];

        $response['meta'] = array();
        foreach ( wp_get_attachment_id3_keys( $attachment, 'js' ) as $key => $label ) {
            $response['meta'][ $key ] = false;

            if ( ! empty( $meta[ $key ] ) ) {
                $response['meta'][ $key ] = $meta[ $key ];
            }
        }

        $id = get_post_thumbnail_id( $attachment->ID );
        if ( ! empty( $id ) ) {
            list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'full' );
            $response['image'] = compact( 'src', 'width', 'height' );
            list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'thumbnail' );
            $response['thumb'] = compact( 'src', 'width', 'height' );
        } else {
            $src = wp_mime_type_icon( $attachment->ID );
            $width = 48;
            $height = 64;
            $response['image'] = compact( 'src', 'width', 'height' );
            $response['thumb'] = compact( 'src', 'width', 'height' );
        }
    }

    if ( function_exists('get_compat_media_markup') )
        $response['compat'] = get_compat_media_markup( $attachment->ID, array( 'in_modal' => true ) );

    /**
     * Filters the attachment data prepared for JavaScript.
     *
     * @since 3.5.0
     *
     * @param array      $response   Array of prepared attachment data.
     * @param int|object $attachment Attachment ID or object.
     * @param array      $meta       Array of attachment meta data.
     */
    return apply_filters( 'wp_prepare_attachment_for_js', $response, $attachment, $meta );
}

/**
 * Enqueues all scripts, styles, settings, and templates necessary to use
 * all media JS APIs.
 *
 * @since 3.5.0
 *
 * @global int       $content_width
 * @global wpdb      $wpdb
 * @global WP_Locale $wp_locale
 *
 * @param array $args {
 *     Arguments for enqueuing media scripts.
 *
 *     @type int|WP_Post A post object or ID.
 * }
 */
function wp_enqueue_media( $args = array() ) {
    // Enqueue me just once per page, please.
    if ( did_action( 'wp_enqueue_media' ) )
        return;

    global $content_width, $wpdb, $wp_locale;

    $defaults = array(
        'post' => null,
    );
    $args = wp_parse_args( $args, $defaults );

    // We're going to pass the old thickbox media tabs to `media_upload_tabs`
    // to ensure plugins will work. We will then unset those tabs.
    $tabs = array(
        // handler action suffix => tab label
        'type'     => '',
        'type_url' => '',
        'gallery'  => '',
        'library'  => '',
    );

    /** This filter is documented in wp-admin/includes/media.php */
    $tabs = apply_filters( 'media_upload_tabs', $tabs );
    unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] );

    $props = array(
        'link'  => get_option( 'image_default_link_type' ), // db default is 'file'
        'align' => get_option( 'image_default_align' ), // empty default
        'size'  => get_option( 'image_default_size' ),  // empty default
    );

    $exts = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() );
    $mimes = get_allowed_mime_types();
    $ext_mimes = array();
    foreach ( $exts as $ext ) {
        foreach ( $mimes as $ext_preg => $mime_match ) {
            if ( preg_match( '#' . $ext . '#i', $ext_preg ) ) {
                $ext_mimes[ $ext ] = $mime_match;
                break;
            }
        }
    }

    /**
     * Allows showing or hiding the "Create Audio Playlist" button in the media library.
     *
     * By default, the "Create Audio Playlist" button will always be shown in
     * the media library.  If this filter returns `null`, a query will be run
     * to determine whether the media library contains any audio items.  This
     * was the default behavior prior to version 4.8.0, but this query is
     * expensive for large media libraries.
     *
     * @since 4.7.4
     * @since 4.8.0 The filter's default value is `true` rather than `null`.
     *
     * @link https://core.trac.wordpress.org/ticket/31071
     *
     * @param bool|null Whether to show the button, or `null` to decide based
     *                  on whether any audio files exist in the media library.
     */
    $show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', true );
    if ( null === $show_audio_playlist ) {
        $show_audio_playlist = $wpdb->get_var( "
            SELECT ID
            FROM $wpdb->posts
            WHERE post_type = 'attachment'
            AND post_mime_type LIKE 'audio%'
            LIMIT 1
        " );
    }

    /**
     * Allows showing or hiding the "Create Video Playlist" button in the media library.
     *
     * By default, the "Create Video Playlist" button will always be shown in
     * the media library.  If this filter returns `null`, a query will be run
     * to determine whether the media library contains any video items.  This
     * was the default behavior prior to version 4.8.0, but this query is
     * expensive for large media libraries.
     *
     * @since 4.7.4
     * @since 4.8.0 The filter's default value is `true` rather than `null`.
     *
     * @link https://core.trac.wordpress.org/ticket/31071
     *
     * @param bool|null Whether to show the button, or `null` to decide based
     *                  on whether any video files exist in the media library.
     */
    $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true );
    if ( null === $show_video_playlist ) {
        $show_video_playlist = $wpdb->get_var( "
            SELECT ID
            FROM $wpdb->posts
            WHERE post_type = 'attachment'
            AND post_mime_type LIKE 'video%'
            LIMIT 1
        " );
    }

    /**
     * Allows overriding the list of months displayed in the media library.
     *
     * By default (if this filter does not return an array), a query will be
     * run to determine the months that have media items.  This query can be
     * expensive for large media libraries, so it may be desirable for sites to
     * override this behavior.
     *
     * @since 4.7.4
     *
     * @link https://core.trac.wordpress.org/ticket/31071
     *
     * @param array|null An array of objects with `month` and `year`
     *                   properties, or `null` (or any other non-array value)
     *                   for default behavior.
     */
    $months = apply_filters( 'media_library_months_with_files', null );
    if ( ! is_array( $months ) ) {
        $months = $wpdb->get_results( $wpdb->prepare( "
            SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
            FROM $wpdb->posts
            WHERE post_type = %s
            ORDER BY post_date DESC
        ", 'attachment' ) );
    }
    foreach ( $months as $month_year ) {
        $month_year->text = sprintf( __( '%1$s %2$d' ), $wp_locale->get_month( $month_year->month ), $month_year->year );
    }

    $settings = array(
        'tabs'      => $tabs,
        'tabUrl'    => add_query_arg( array( 'chromeless' => true ), admin_url('media-upload.php') ),
        'mimeTypes' => wp_list_pluck( get_post_mime_types(), 0 ),
        /** This filter is documented in wp-admin/includes/media.php */
        'captions'  => ! apply_filters( 'disable_captions', '' ),
        'nonce'     => array(
            'sendToEditor' => wp_create_nonce( 'media-send-to-editor' ),
        ),
        'post'    => array(
            'id' => 0,
        ),
        'defaultProps' => $props,
        'attachmentCounts' => array(
            'audio' => ( $show_audio_playlist ) ? 1 : 0,
            'video' => ( $show_video_playlist ) ? 1 : 0,
        ),
        'oEmbedProxyUrl' => rest_url( 'oembed/1.0/proxy' ),
        'embedExts'    => $exts,
        'embedMimes'   => $ext_mimes,
        'contentWidth' => $content_width,
        'months'       => $months,
        'mediaTrash'   => MEDIA_TRASH ? 1 : 0,
    );

    $post = null;
    if ( isset( $args['post'] ) ) {
        $post = get_post( $args['post'] );
        $settings['post'] = array(
            'id' => $post->ID,
            'nonce' => wp_create_nonce( 'update-post_' . $post->ID ),
        );

        $thumbnail_support = current_theme_supports( 'post-thumbnails', $post->post_type ) && post_type_supports( $post->post_type, 'thumbnail' );
        if ( ! $thumbnail_support && 'attachment' === $post->post_type && $post->post_mime_type ) {
            if ( wp_attachment_is( 'audio', $post ) ) {
                $thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
            } elseif ( wp_attachment_is( 'video', $post ) ) {
                $thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
            }
        }

        if ( $thumbnail_support ) {
            $featured_image_id = get_post_meta( $post->ID, '_thumbnail_id', true );
            $settings['post']['featuredImageId'] = $featured_image_id ? $featured_image_id : -1;
        }
    }

    if ( $post ) {
        $post_type_object = get_post_type_object( $post->post_type );
    } else {
        $post_type_object = get_post_type_object( 'post' );
    }

    $strings = array(
        // Generic
        'url'         => __( 'URL' ),
        'addMedia'    => __( 'Add Media' ),
        'search'      => __( 'Search' ),
        'select'      => __( 'Select' ),
        'cancel'      => __( 'Cancel' ),
        'update'      => __( 'Update' ),
        'replace'     => __( 'Replace' ),
        'remove'      => __( 'Remove' ),
        'back'        => __( 'Back' ),
        /* translators: This is a would-be plural string used in the media manager.
           If there is not a word you can use in your language to avoid issues with the
           lack of plural support here, turn it into "selected: %d" then translate it.
         */
        'selected'    => __( '%d selected' ),
        'dragInfo'    => __( 'Drag and drop to reorder media files.' ),

        // Upload
        'uploadFilesTitle'  => __( 'Upload Files' ),
        'uploadImagesTitle' => __( 'Upload Images' ),

        // Library
        'mediaLibraryTitle'      => __( 'Media Library' ),
        'insertMediaTitle'       => __( 'Add Media' ),
        'createNewGallery'       => __( 'Create a new gallery' ),
        'createNewPlaylist'      => __( 'Create a new playlist' ),
        'createNewVideoPlaylist' => __( 'Create a new video playlist' ),
        'returnToLibrary'        => __( '← Return to library' ),
        'allMediaItems'          => __( 'All media items' ),
        'allDates'               => __( 'All dates' ),
        'noItemsFound'           => __( 'No items found.' ),
        'insertIntoPost'         => $post_type_object->labels->insert_into_item,
        'unattached'             => __( 'Unattached' ),
        'trash'                  => _x( 'Trash', 'noun' ),
        'uploadedToThisPost'     => $post_type_object->labels->uploaded_to_this_item,
        'warnDelete'             => __( "You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
        'warnBulkDelete'         => __( "You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
        'warnBulkTrash'          => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
        'bulkSelect'             => __( 'Bulk Select' ),
        'cancelSelection'        => __( 'Cancel Selection' ),
        'trashSelected'          => __( 'Trash Selected' ),
        'untrashSelected'        => __( 'Untrash Selected' ),
        'deleteSelected'         => __( 'Delete Selected' ),
        'deletePermanently'      => __( 'Delete Permanently' ),
        'apply'                  => __( 'Apply' ),
        'filterByDate'           => __( 'Filter by date' ),
        'filterByType'           => __( 'Filter by type' ),
        'searchMediaLabel'       => __( 'Search Media' ),
        'searchMediaPlaceholder' => __( 'Search media items...' ), // placeholder (no ellipsis)
        'noMedia'                => __( 'No media files found.' ),

        // Library Details
        'attachmentDetails'  => __( 'Attachment Details' ),

        // From URL
        'insertFromUrlTitle' => __( 'Insert from URL' ),

        // Featured Images
        'setFeaturedImageTitle' => $post_type_object->labels->featured_image,
        'setFeaturedImage'      => $post_type_object->labels->set_featured_image,

        // Gallery
        'createGalleryTitle' => __( 'Create Gallery' ),
        'editGalleryTitle'   => __( 'Edit Gallery' ),
        'cancelGalleryTitle' => __( '← Cancel Gallery' ),
        'insertGallery'      => __( 'Insert gallery' ),
        'updateGallery'      => __( 'Update gallery' ),
        'addToGallery'       => __( 'Add to gallery' ),
        'addToGalleryTitle'  => __( 'Add to Gallery' ),
        'reverseOrder'       => __( 'Reverse order' ),

        // Edit Image
        'imageDetailsTitle'     => __( 'Image Details' ),
        'imageReplaceTitle'     => __( 'Replace Image' ),
        'imageDetailsCancel'    => __( 'Cancel Edit' ),
        'editImage'             => __( 'Edit Image' ),

        // Crop Image
        'chooseImage' => __( 'Choose Image' ),
        'selectAndCrop' => __( 'Select and Crop' ),
        'skipCropping' => __( 'Skip Cropping' ),
        'cropImage' => __( 'Crop Image' ),
        'cropYourImage' => __( 'Crop your image' ),
        'cropping' => __( 'Cropping…' ),
        /* translators: 1: suggested width number, 2: suggested height number. */
        'suggestedDimensions' => __( 'Suggested image dimensions: %1$s by %2$s pixels.' ),
        'cropError' => __( 'There has been an error cropping your image.' ),

        // Edit Audio
        'audioDetailsTitle'     => __( 'Audio Details' ),
        'audioReplaceTitle'     => __( 'Replace Audio' ),
        'audioAddSourceTitle'   => __( 'Add Audio Source' ),
        'audioDetailsCancel'    => __( 'Cancel Edit' ),

        // Edit Video
        'videoDetailsTitle'     => __( 'Video Details' ),
        'videoReplaceTitle'     => __( 'Replace Video' ),
        'videoAddSourceTitle'   => __( 'Add Video Source' ),
        'videoDetailsCancel'    => __( 'Cancel Edit' ),
        'videoSelectPosterImageTitle' => __( 'Select Poster Image' ),
        'videoAddTrackTitle'    => __( 'Add Subtitles' ),

         // Playlist
         'playlistDragInfo'    => __( 'Drag and drop to reorder tracks.' ),
         'createPlaylistTitle' => __( 'Create Audio Playlist' ),
         'editPlaylistTitle'   => __( 'Edit Audio Playlist' ),
         'cancelPlaylistTitle' => __( '← Cancel Audio Playlist' ),
         'insertPlaylist'      => __( 'Insert audio playlist' ),
         'updatePlaylist'      => __( 'Update audio playlist' ),
         'addToPlaylist'       => __( 'Add to audio playlist' ),
         'addToPlaylistTitle'  => __( 'Add to Audio Playlist' ),

         // Video Playlist
         'videoPlaylistDragInfo'    => __( 'Drag and drop to reorder videos.' ),
         'createVideoPlaylistTitle' => __( 'Create Video Playlist' ),
         'editVideoPlaylistTitle'   => __( 'Edit Video Playlist' ),
         'cancelVideoPlaylistTitle' => __( '← Cancel Video Playlist' ),
         'insertVideoPlaylist'      => __( 'Insert video playlist' ),
         'updateVideoPlaylist'      => __( 'Update video playlist' ),
         'addToVideoPlaylist'       => __( 'Add to video playlist' ),
         'addToVideoPlaylistTitle'  => __( 'Add to Video Playlist' ),
    );

    /**
     * Filters the media view settings.
     *
     * @since 3.5.0
     *
     * @param array   $settings List of media view settings.
     * @param WP_Post $post     Post object.
     */
    $settings = apply_filters( 'media_view_settings', $settings, $post );

    /**
     * Filters the media view strings.
     *
     * @since 3.5.0
     *
     * @param array   $strings List of media view strings.
     * @param WP_Post $post    Post object.
     */
    $strings = apply_filters( 'media_view_strings', $strings,  $post );

    $strings['settings'] = $settings;

    // Ensure we enqueue media-editor first, that way media-views is
    // registered internally before we try to localize it. see #24724.
    wp_enqueue_script( 'media-editor' );
    wp_localize_script( 'media-views', '_wpMediaViewsL10n', $strings );

    wp_enqueue_script( 'media-audiovideo' );
    wp_enqueue_style( 'media-views' );
    if ( is_admin() ) {
        wp_enqueue_script( 'mce-view' );
        wp_enqueue_script( 'image-edit' );
    }
    wp_enqueue_style( 'imgareaselect' );
    wp_plupload_default_settings();

    require_once ABSPATH . WPINC . '/media-template.php';
    add_action( 'admin_footer', 'wp_print_media_templates' );
    add_action( 'wp_footer', 'wp_print_media_templates' );
    add_action( 'customize_controls_print_footer_scripts', 'wp_print_media_templates' );

    /**
     * Fires at the conclusion of wp_enqueue_media().
     *
     * @since 3.5.0
     */
    do_action( 'wp_enqueue_media' );
}

/**
 * Retrieves media attached to the passed post.
 *
 * @since 3.6.0
 *
 * @param string      $type Mime type.
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return array Found attachments.
 */
function get_attached_media( $type, $post = 0 ) {
    if ( ! $post = get_post( $post ) )
        return array();

    $args = array(
        'post_parent' => $post->ID,
        'post_type' => 'attachment',
        'post_mime_type' => $type,
        'posts_per_page' => -1,
        'orderby' => 'menu_order',
        'order' => 'ASC',
    );

    /**
     * Filters arguments used to retrieve media attached to the given post.
     *
     * @since 3.6.0
     *
     * @param array  $args Post query arguments.
     * @param string $type Mime type of the desired media.
     * @param mixed  $post Post ID or object.
     */
    $args = apply_filters( 'get_attached_media_args', $args, $type, $post );

    $children = get_children( $args );

    /**
     * Filters the list of media attached to the given post.
     *
     * @since 3.6.0
     *
     * @param array  $children Associative array of media attached to the given post.
     * @param string $type     Mime type of the media desired.
     * @param mixed  $post     Post ID or object.
     */
    return (array) apply_filters( 'get_attached_media', $children, $type, $post );
}

/**
 * Check the content blob for an audio, video, object, embed, or iframe tags.
 *
 * @since 3.6.0
 *
 * @param string $content A string which might contain media data.
 * @param array  $types   An array of media types: 'audio', 'video', 'object', 'embed', or 'iframe'.
 * @return array A list of found HTML media embeds.
 */
function get_media_embedded_in_content( $content, $types = null ) {
    $html = array();

    /**
     * Filters the embedded media types that are allowed to be returned from the content blob.
     *
     * @since 4.2.0
     *
     * @param array $allowed_media_types An array of allowed media types. Default media types are
     *                                   'audio', 'video', 'object', 'embed', and 'iframe'.
     */
    $allowed_media_types = apply_filters( 'media_embedded_in_content_allowed_types', array( 'audio', 'video', 'object', 'embed', 'iframe' ) );

    if ( ! empty( $types ) ) {
        if ( ! is_array( $types ) ) {
            $types = array( $types );
        }

        $allowed_media_types = array_intersect( $allowed_media_types, $types );
    }

    $tags = implode( '|', $allowed_media_types );

    if ( preg_match_all( '#<(?P<tag>' . $tags . ')[^<]*?(?:>[\s\S]*?<\/(?P=tag)>|\s*\/>)#', $content, $matches ) ) {
        foreach ( $matches[0] as $match ) {
            $html[] = $match;
        }
    }

    return $html;
}

/**
 * Retrieves galleries from the passed post's content.
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Post ID or object.
 * @param bool        $html Optional. Whether to return HTML or data in the array. Default true.
 * @return array A list of arrays, each containing gallery data and srcs parsed
 *               from the expanded shortcode.
 */
function get_post_galleries( $post, $html = true ) {
    if ( ! $post = get_post( $post ) )
        return array();

    if ( ! has_shortcode( $post->post_content, 'gallery' ) )
        return array();

    $galleries = array();
    if ( preg_match_all( '/' . get_shortcode_regex() . '/s', $post->post_content, $matches, PREG_SET_ORDER ) ) {
        foreach ( $matches as $shortcode ) {
            if ( 'gallery' === $shortcode[2] ) {
                $srcs = array();

                $shortcode_attrs = shortcode_parse_atts( $shortcode[3] );
                if ( ! is_array( $shortcode_attrs ) ) {
                    $shortcode_attrs = array();
                }

                // Specify the post id of the gallery we're viewing if the shortcode doesn't reference another post already.
                if ( ! isset( $shortcode_attrs['id'] ) ) {
                    $shortcode[3] .= ' id="' . intval( $post->ID ) . '"';
                }

                $gallery = do_shortcode_tag( $shortcode );
                if ( $html ) {
                    $galleries[] = $gallery;
                } else {
                    preg_match_all( '#src=([\'"])(.+?)\1#is', $gallery, $src, PREG_SET_ORDER );
                    if ( ! empty( $src ) ) {
                        foreach ( $src as $s ) {
                            $srcs[] = $s[2];
                        }
                    }

                    $galleries[] = array_merge(
                        $shortcode_attrs,
                        array(
                            'src' => array_values( array_unique( $srcs ) )
                        )
                    );
                }
            }
        }
    }

    /**
     * Filters the list of all found galleries in the given post.
     *
     * @since 3.6.0
     *
     * @param array   $galleries Associative array of all found post galleries.
     * @param WP_Post $post      Post object.
     */
    return apply_filters( 'get_post_galleries', $galleries, $post );
}

/**
 * Check a specified post's content for gallery and, if present, return the first
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @param bool        $html Optional. Whether to return HTML or data. Default is true.
 * @return string|array Gallery data and srcs parsed from the expanded shortcode.
 */
function get_post_gallery( $post = 0, $html = true ) {
    $galleries = get_post_galleries( $post, $html );
    $gallery = reset( $galleries );

    /**
     * Filters the first-found post gallery.
     *
     * @since 3.6.0
     *
     * @param array       $gallery   The first-found post gallery.
     * @param int|WP_Post $post      Post ID or object.
     * @param array       $galleries Associative array of all found post galleries.
     */
    return apply_filters( 'get_post_gallery', $gallery, $post, $galleries );
}

/**
 * Retrieve the image srcs from galleries from a post's content, if present
 *
 * @since 3.6.0
 *
 * @see get_post_galleries()
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return array A list of lists, each containing image srcs parsed.
 *               from an expanded shortcode
 */
function get_post_galleries_images( $post = 0 ) {
    $galleries = get_post_galleries( $post, false );
    return wp_list_pluck( $galleries, 'src' );
}

/**
 * Checks a post's content for galleries and return the image srcs for the first found gallery
 *
 * @since 3.6.0
 *
 * @see get_post_gallery()
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return array A list of a gallery's image srcs in order.
 */
function get_post_gallery_images( $post = 0 ) {
    $gallery = get_post_gallery( $post, false );
    return empty( $gallery['src'] ) ? array() : $gallery['src'];
}

/**
 * Maybe attempts to generate attachment metadata, if missing.
 *
 * @since 3.9.0
 *
 * @param WP_Post $attachment Attachment object.
 */
function wp_maybe_generate_attachment_metadata( $attachment ) {
    if ( empty( $attachment ) || ( empty( $attachment->ID ) || ! $attachment_id = (int) $attachment->ID ) ) {
        return;
    }

    $file = get_attached_file( $attachment_id );
    $meta = wp_get_attachment_metadata( $attachment_id );
    if ( empty( $meta ) && file_exists( $file ) ) {
        $_meta = get_post_meta( $attachment_id );
        $regeneration_lock = 'wp_generating_att_' . $attachment_id;
        if ( ! array_key_exists( '_wp_attachment_metadata', $_meta ) && ! get_transient( $regeneration_lock ) ) {
            set_transient( $regeneration_lock, $file );
            wp_update_attachment_metadata( $attachment_id, wp_generate_attachment_metadata( $attachment_id, $file ) );
            delete_transient( $regeneration_lock );
        }
    }
}

/**
 * Tries to convert an attachment URL into a post ID.
 *
 * @since 4.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $url The URL to resolve.
 * @return int The found post ID, or 0 on failure.
 */
function attachment_url_to_postid( $url ) {
    global $wpdb;

    $dir = wp_get_upload_dir();
    $path = $url;

    $site_url = parse_url( $dir['url'] );
    $image_path = parse_url( $path );

    //force the protocols to match if needed
    if ( isset( $image_path['scheme'] ) && ( $image_path['scheme'] !== $site_url['scheme'] ) ) {
        $path = str_replace( $image_path['scheme'], $site_url['scheme'], $path );
    }

    if ( 0 === strpos( $path, $dir['baseurl'] . '/' ) ) {
        $path = substr( $path, strlen( $dir['baseurl'] . '/' ) );
    }

    $sql = $wpdb->prepare(
        "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file' AND meta_value = %s",
        $path
    );
    $post_id = $wpdb->get_var( $sql );

    /**
     * Filters an attachment id found by URL.
     *
     * @since 4.2.0
     *
     * @param int|null $post_id The post_id (if any) found by the function.
     * @param string   $url     The URL being looked up.
     */
    return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url );
}

/**
 * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view.
 *
 * @since 4.0.0
 *
 * @return array The relevant CSS file URLs.
 */
function wpview_media_sandbox_styles() {
     $version = 'ver=' . get_bloginfo( 'version' );
     $mediaelement = includes_url( "js/mediaelement/mediaelementplayer-legacy.min.css?$version" );
     $wpmediaelement = includes_url( "js/mediaelement/wp-mediaelement.css?$version" );

    return array( $mediaelement, $wpmediaelement );
}