HTML Examples/WP.iso/wordpress/wp-includes/comment-template.php

PHP Script | 2017-08-20 | 85.4 KB | 2,468 lines

<?php
/**
 * Comment template functions
 *
 * These functions are meant to live inside of the WordPress loop.
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * Retrieve the author of the current comment.
 *
 * If the comment has an empty comment_author field, then 'Anonymous' person is
 * assumed.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to retrieve the author.
 *                                     Default current comment.
 * @return string The comment author
 */
function get_comment_author( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );

    if ( empty( $comment->comment_author ) ) {
        if ( $comment->user_id && $user = get_userdata( $comment->user_id ) )
            $author = $user->display_name;
        else
            $author = __('Anonymous');
    } else {
        $author = $comment->comment_author;
    }

    /**
     * Filters the returned comment author name.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
     *
     * @param string     $author     The comment author's username.
     * @param int        $comment_ID The comment ID.
     * @param WP_Comment $comment    The comment object.
     */
    return apply_filters( 'get_comment_author', $author, $comment->comment_ID, $comment );
}

/**
 * Displays the author of the current comment.
 *
 * @since 0.71
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to print the author.
 *                                     Default current comment.
 */
function comment_author( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );
    $author  = get_comment_author( $comment );

    /**
     * Filters the comment author's name for display.
     *
     * @since 1.2.0
     * @since 4.1.0 The `$comment_ID` parameter was added.
     *
     * @param string $author     The comment author's username.
     * @param int    $comment_ID The comment ID.
     */
    echo apply_filters( 'comment_author', $author, $comment->comment_ID );
}

/**
 * Retrieve the email of the author of the current comment.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to get the author's email.
 *                                     Default current comment.
 * @return string The current comment author's email
 */
function get_comment_author_email( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );

    /**
     * Filters the comment author's returned email address.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
     *
     * @param string     $comment_author_email The comment author's email address.
     * @param int        $comment_ID           The comment ID.
     * @param WP_Comment $comment              The comment object.
     */
    return apply_filters( 'get_comment_author_email', $comment->comment_author_email, $comment->comment_ID, $comment );
}

/**
 * Display the email of the author of the current global $comment.
 *
 * Care should be taken to protect the email address and assure that email
 * harvesters do not capture your commentors' email address. Most assume that
 * their email address will not appear in raw form on the site. Doing so will
 * enable anyone, including those that people don't want to get the email
 * address and use it for their own means good and bad.
 *
 * @since 0.71
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to print the author's email.
 *                                     Default current comment.
 */
function comment_author_email( $comment_ID = 0 ) {
    $comment      = get_comment( $comment_ID );
    $author_email = get_comment_author_email( $comment );

    /**
     * Filters the comment author's email for display.
     *
     * @since 1.2.0
     * @since 4.1.0 The `$comment_ID` parameter was added.
     *
     * @param string $author_email The comment author's email address.
     * @param int    $comment_ID   The comment ID.
     */
    echo apply_filters( 'author_email', $author_email, $comment->comment_ID );
}

/**
 * Display the html email link to the author of the current comment.
 *
 * Care should be taken to protect the email address and assure that email
 * harvesters do not capture your commentors' email address. Most assume that
 * their email address will not appear in raw form on the site. Doing so will
 * enable anyone, including those that people don't want to get the email
 * address and use it for their own means good and bad.
 *
 * @since 0.71
 * @since 4.6.0 Added the `$comment` parameter.
 *
 * @param string         $linktext Optional. Text to display instead of the comment author's email address.
 *                                 Default empty.
 * @param string         $before   Optional. Text or HTML to display before the email link. Default empty.
 * @param string         $after    Optional. Text or HTML to display after the email link. Default empty.
 * @param int|WP_Comment $comment  Optional. Comment ID or WP_Comment object. Default is the current comment.
 */
function comment_author_email_link( $linktext = '', $before = '', $after = '', $comment = null ) {
    if ( $link = get_comment_author_email_link( $linktext, $before, $after, $comment ) ) {
        echo $link;
    }
}

/**
 * Return the html email link to the author of the current comment.
 *
 * Care should be taken to protect the email address and assure that email
 * harvesters do not capture your commentors' email address. Most assume that
 * their email address will not appear in raw form on the site. Doing so will
 * enable anyone, including those that people don't want to get the email
 * address and use it for their own means good and bad.
 *
 * @since 2.7.0
 * @since 4.6.0 Added the `$comment` parameter.
 *
 * @param string         $linktext Optional. Text to display instead of the comment author's email address.
 *                                 Default empty.
 * @param string         $before   Optional. Text or HTML to display before the email link. Default empty.
 * @param string         $after    Optional. Text or HTML to display after the email link. Default empty.
 * @param int|WP_Comment $comment  Optional. Comment ID or WP_Comment object. Default is the current comment.
 * @return string HTML markup for the comment author email link. By default, the email address is obfuscated
 *                via the {@see 'comment_email'} filter with antispambot().
 */
function get_comment_author_email_link( $linktext = '', $before = '', $after = '', $comment = null ) {
    $comment = get_comment( $comment );

    /**
     * Filters the comment author's email for display.
     *
     * Care should be taken to protect the email address and assure that email
     * harvesters do not capture your commenter's email address.
     *
     * @since 1.2.0
     * @since 4.1.0 The `$comment` parameter was added.
     *
     * @param string     $comment_author_email The comment author's email address.
     * @param WP_Comment $comment              The comment object.
     */
    $email = apply_filters( 'comment_email', $comment->comment_author_email, $comment );

    if ((!empty($email)) && ($email != '@')) {
    $display = ($linktext != '') ? $linktext : $email;
        $return  = $before;
        $return .= sprintf( '<a href="%1$s">%2$s</a>', esc_url( 'mailto:' . $email ), esc_html( $display ) );
         $return .= $after;
        return $return;
    } else {
        return '';
    }
}

/**
 * Retrieve the HTML link to the URL of the author of the current comment.
 *
 * Both get_comment_author_url() and get_comment_author() rely on get_comment(),
 * which falls back to the global comment variable if the $comment_ID argument is empty.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to get the author's link.
 *                                     Default current comment.
 * @return string The comment author name or HTML link for author's URL.
 */
function get_comment_author_link( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );
    $url     = get_comment_author_url( $comment );
    $author  = get_comment_author( $comment );

    if ( empty( $url ) || 'http://' == $url )
        $return = $author;
    else
        $return = "<a href='$url' rel='external nofollow' class='url'>$author</a>";

    /**
     * Filters the comment author's link for display.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$author` and `$comment_ID` parameters were added.
     *
     * @param string $return     The HTML-formatted comment author link.
     *                           Empty for an invalid URL.
     * @param string $author     The comment author's username.
     * @param int    $comment_ID The comment ID.
     */
    return apply_filters( 'get_comment_author_link', $return, $author, $comment->comment_ID );
}

/**
 * Display the html link to the url of the author of the current comment.
 *
 * @since 0.71
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to print the author's link.
 *                                     Default current comment.
 */
function comment_author_link( $comment_ID = 0 ) {
    echo get_comment_author_link( $comment_ID );
}

/**
 * Retrieve the IP address of the author of the current comment.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to get the author's IP address.
 *                                     Default current comment.
 * @return string Comment author's IP address.
 */
function get_comment_author_IP( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );

    /**
     * Filters the comment author's returned IP address.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
     *
     * @param string     $comment_author_IP The comment author's IP address.
     * @param int        $comment_ID        The comment ID.
     * @param WP_Comment $comment           The comment object.
     */
    return apply_filters( 'get_comment_author_IP', $comment->comment_author_IP, $comment->comment_ID, $comment );
}

/**
 * Display the IP address of the author of the current comment.
 *
 * @since 0.71
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to print the author's IP address.
 *                                     Default current comment.
 */
function comment_author_IP( $comment_ID = 0 ) {
    echo esc_html( get_comment_author_IP( $comment_ID ) );
}

/**
 * Retrieve the url of the author of the current comment.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to get the author's URL.
 *                                     Default current comment.
 * @return string Comment author URL.
 */
function get_comment_author_url( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );
    $url = '';
    $id = 0;
    if ( ! empty( $comment ) ) {
        $author_url = ( 'http://' == $comment->comment_author_url ) ? '' : $comment->comment_author_url;
        $url = esc_url( $author_url, array( 'http', 'https' ) );
        $id = $comment->comment_ID;
    }

    /**
     * Filters the comment author's URL.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
     *
     * @param string     $url        The comment author's URL.
     * @param int        $comment_ID The comment ID.
     * @param WP_Comment $comment    The comment object.
     */
    return apply_filters( 'get_comment_author_url', $url, $id, $comment );
}

/**
 * Display the url of the author of the current comment.
 *
 * @since 0.71
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or the ID of the comment for which to print the author's URL.
 *                                     Default current comment.
 */
function comment_author_url( $comment_ID = 0 ) {
    $comment    = get_comment( $comment_ID );
    $author_url = get_comment_author_url( $comment );

    /**
     * Filters the comment author's URL for display.
     *
     * @since 1.2.0
     * @since 4.1.0 The `$comment_ID` parameter was added.
     *
     * @param string $author_url The comment author's URL.
     * @param int    $comment_ID The comment ID.
     */
    echo apply_filters( 'comment_url', $author_url, $comment->comment_ID );
}

/**
 * Retrieves the HTML link of the url of the author of the current comment.
 *
 * $linktext parameter is only used if the URL does not exist for the comment
 * author. If the URL does exist then the URL will be used and the $linktext
 * will be ignored.
 *
 * Encapsulate the HTML link between the $before and $after. So it will appear
 * in the order of $before, link, and finally $after.
 *
 * @since 1.5.0
 * @since 4.6.0 Added the `$comment` parameter.
 *
 * @param string         $linktext Optional. The text to display instead of the comment
 *                                 author's email address. Default empty.
 * @param string         $before   Optional. The text or HTML to display before the email link.
 *                                 Default empty.
 * @param string         $after    Optional. The text or HTML to display after the email link.
 *                                 Default empty.
 * @param int|WP_Comment $comment  Optional. Comment ID or WP_Comment object.
 *                                 Default is the current comment.
 * @return string The HTML link between the $before and $after parameters.
 */
function get_comment_author_url_link( $linktext = '', $before = '', $after = '', $comment = 0 ) {
    $url = get_comment_author_url( $comment );
    $display = ($linktext != '') ? $linktext : $url;
    $display = str_replace( 'http://www.', '', $display );
    $display = str_replace( 'http://', '', $display );

    if ( '/' == substr($display, -1) ) {
        $display = substr($display, 0, -1);
    }

    $return = "$before<a href='$url' rel='external'>$display</a>$after";

    /**
     * Filters the comment author's returned URL link.
     *
     * @since 1.5.0
     *
     * @param string $return The HTML-formatted comment author URL link.
     */
    return apply_filters( 'get_comment_author_url_link', $return );
}

/**
 * Displays the HTML link of the url of the author of the current comment.
 *
 * @since 0.71
 * @since 4.6.0 Added the `$comment` parameter.
 *
 * @param string         $linktext Optional. Text to display instead of the comment author's
 *                                 email address. Default empty.
 * @param string         $before   Optional. Text or HTML to display before the email link.
 *                                 Default empty.
 * @param string         $after    Optional. Text or HTML to display after the email link.
 *                                 Default empty.
 * @param int|WP_Comment $comment  Optional. Comment ID or WP_Comment object.
 *                                 Default is the current comment.
 */
function comment_author_url_link( $linktext = '', $before = '', $after = '', $comment = 0 ) {
    echo get_comment_author_url_link( $linktext, $before, $after, $comment );
}

/**
 * Generates semantic classes for each comment element.
 *
 * @since 2.7.0
 * @since 4.4.0 Added the ability for `$comment` to also accept a WP_Comment object.
 *
 * @param string|array   $class    Optional. One or more classes to add to the class list.
 *                                 Default empty.
 * @param int|WP_Comment $comment  Comment ID or WP_Comment object. Default current comment.
 * @param int|WP_Post    $post_id  Post ID or WP_Post object. Default current post.
 * @param bool           $echo     Optional. Whether to cho or return the output.
 *                                 Default true.
 * @return string If `$echo` is false, the class will be returned. Void otherwise.
 */
function comment_class( $class = '', $comment = null, $post_id = null, $echo = true ) {
    // Separates classes with a single space, collates classes for comment DIV
    $class = 'class="' . join( ' ', get_comment_class( $class, $comment, $post_id ) ) . '"';
    if ( $echo)
        echo $class;
    else
        return $class;
}

/**
 * Returns the classes for the comment div as an array.
 *
 * @since 2.7.0
 * @since 4.4.0 Added the ability for `$comment_id` to also accept a WP_Comment object.
 *
 * @global int $comment_alt
 * @global int $comment_depth
 * @global int $comment_thread_alt
 *
 * @param string|array   $class      Optional. One or more classes to add to the class list. Default empty.
 * @param int|WP_Comment $comment_id Comment ID or WP_Comment object. Default current comment.
 * @param int|WP_Post    $post_id    Post ID or WP_Post object. Default current post.
 * @return array An array of classes.
 */
function get_comment_class( $class = '', $comment_id = null, $post_id = null ) {
    global $comment_alt, $comment_depth, $comment_thread_alt;

    $classes = array();

    $comment = get_comment( $comment_id );
    if ( ! $comment ) {
        return $classes;
    }

    // Get the comment type (comment, trackback),
    $classes[] = ( empty( $comment->comment_type ) ) ? 'comment' : $comment->comment_type;

    // Add classes for comment authors that are registered users.
    if ( $comment->user_id > 0 && $user = get_userdata( $comment->user_id ) ) {
        $classes[] = 'byuser';
        $classes[] = 'comment-author-' . sanitize_html_class( $user->user_nicename, $comment->user_id );
        // For comment authors who are the author of the post
        if ( $post = get_post($post_id) ) {
            if ( $comment->user_id === $post->post_author ) {
                $classes[] = 'bypostauthor';
            }
        }
    }

    if ( empty($comment_alt) )
        $comment_alt = 0;
    if ( empty($comment_depth) )
        $comment_depth = 1;
    if ( empty($comment_thread_alt) )
        $comment_thread_alt = 0;

    if ( $comment_alt % 2 ) {
        $classes[] = 'odd';
        $classes[] = 'alt';
    } else {
        $classes[] = 'even';
    }

    $comment_alt++;

    // Alt for top-level comments
    if ( 1 == $comment_depth ) {
        if ( $comment_thread_alt % 2 ) {
            $classes[] = 'thread-odd';
            $classes[] = 'thread-alt';
        } else {
            $classes[] = 'thread-even';
        }
        $comment_thread_alt++;
    }

    $classes[] = "depth-$comment_depth";

    if ( !empty($class) ) {
        if ( !is_array( $class ) )
            $class = preg_split('#\s+#', $class);
        $classes = array_merge($classes, $class);
    }

    $classes = array_map('esc_attr', $classes);

    /**
     * Filters the returned CSS classes for the current comment.
     *
     * @since 2.7.0
     *
     * @param array       $classes    An array of comment classes.
     * @param string      $class      A comma-separated list of additional classes added to the list.
     * @param int         $comment_id The comment id.
     * @param WP_Comment  $comment    The comment object.
     * @param int|WP_Post $post_id    The post ID or WP_Post object.
     */
    return apply_filters( 'comment_class', $classes, $class, $comment->comment_ID, $comment, $post_id );
}

/**
 * Retrieve the comment date of the current comment.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param string          $d          Optional. The format of the date. Default user's setting.
 * @param int|WP_Comment  $comment_ID WP_Comment or ID of the comment for which to get the date.
 *                                    Default current comment.
 * @return string The comment's date.
 */
function get_comment_date( $d = '', $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );
    if ( '' == $d )
        $date = mysql2date(get_option('date_format'), $comment->comment_date);
    else
        $date = mysql2date($d, $comment->comment_date);
    /**
     * Filters the returned comment date.
     *
     * @since 1.5.0
     *
     * @param string|int $date    Formatted date string or Unix timestamp.
     * @param string     $d       The format of the date.
     * @param WP_Comment $comment The comment object.
     */
    return apply_filters( 'get_comment_date', $date, $d, $comment );
}

/**
 * Display the comment date of the current comment.
 *
 * @since 0.71
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param string         $d          Optional. The format of the date. Default user's settings.
 * @param int|WP_Comment $comment_ID WP_Comment or ID of the comment for which to print the date.
 *                                   Default current comment.
 */
function comment_date( $d = '', $comment_ID = 0 ) {
    echo get_comment_date( $d, $comment_ID );
}

/**
 * Retrieve the excerpt of the current comment.
 *
 * Will cut each word and only output the first 20 words with '…' at the end.
 * If the word count is less than 20, then no truncating is done and no '…'
 * will appear.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID  WP_Comment or ID of the comment for which to get the excerpt.
 *                                    Default current comment.
 * @return string The maybe truncated comment with 20 words or less.
 */
function get_comment_excerpt( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );
    $comment_text = strip_tags( str_replace( array( "\n", "\r" ), ' ', $comment->comment_content ) );
    $words = explode( ' ', $comment_text );

    /**
     * Filters the amount of words used in the comment excerpt.
     *
     * @since 4.4.0
     *
     * @param int $comment_excerpt_length The amount of words you want to display in the comment excerpt.
     */
    $comment_excerpt_length = apply_filters( 'comment_excerpt_length', 20 );

    $use_ellipsis = count( $words ) > $comment_excerpt_length;
    if ( $use_ellipsis ) {
        $words = array_slice( $words, 0, $comment_excerpt_length );
    }

    $excerpt = trim( join( ' ', $words ) );
    if ( $use_ellipsis ) {
        $excerpt .= '…';
    }
    /**
     * Filters the retrieved comment excerpt.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
     *
     * @param string     $excerpt    The comment excerpt text.
     * @param int        $comment_ID The comment ID.
     * @param WP_Comment $comment    The comment object.
     */
    return apply_filters( 'get_comment_excerpt', $excerpt, $comment->comment_ID, $comment );
}

/**
 * Display the excerpt of the current comment.
 *
 * @since 1.2.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID  WP_Comment or ID of the comment for which to print the excerpt.
 *                                    Default current comment.
 */
function comment_excerpt( $comment_ID = 0 ) {
    $comment         = get_comment( $comment_ID );
    $comment_excerpt = get_comment_excerpt( $comment );

    /**
     * Filters the comment excerpt for display.
     *
     * @since 1.2.0
     * @since 4.1.0 The `$comment_ID` parameter was added.
     *
     * @param string $comment_excerpt The comment excerpt text.
     * @param int    $comment_ID      The comment ID.
     */
    echo apply_filters( 'comment_excerpt', $comment_excerpt, $comment->comment_ID );
}

/**
 * Retrieve the comment id of the current comment.
 *
 * @since 1.5.0
 *
 * @return int The comment ID.
 */
function get_comment_ID() {
    $comment = get_comment();

    /**
     * Filters the returned comment ID.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$comment_ID` parameter was added.
     *
     * @param int        $comment_ID The current comment ID.
     * @param WP_Comment $comment    The comment object.
     */
    return apply_filters( 'get_comment_ID', $comment->comment_ID, $comment );
}

/**
 * Display the comment id of the current comment.
 *
 * @since 0.71
 */
function comment_ID() {
    echo get_comment_ID();
}

/**
 * Retrieve the link to a given comment.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment` to also accept a WP_Comment object. Added `$cpage` argument.
 *
 * @see get_page_of_comment()
 *
 * @global WP_Rewrite $wp_rewrite
 * @global bool       $in_comment_loop
 *
 * @param WP_Comment|int|null $comment Comment to retrieve. Default current comment.
 * @param array               $args {
 *     An array of optional arguments to override the defaults.
 *
 *     @type string     $type      Passed to get_page_of_comment().
 *     @type int        $page      Current page of comments, for calculating comment pagination.
 *     @type int        $per_page  Per-page value for comment pagination.
 *     @type int        $max_depth Passed to get_page_of_comment().
 *     @type int|string $cpage     Value to use for the comment's "comment-page" or "cpage" value.
 *                                 If provided, this value overrides any value calculated from `$page`
 *                                 and `$per_page`.
 * }
 * @return string The permalink to the given comment.
 */
function get_comment_link( $comment = null, $args = array() ) {
    global $wp_rewrite, $in_comment_loop;

    $comment = get_comment($comment);

    // Back-compat.
    if ( ! is_array( $args ) ) {
        $args = array( 'page' => $args );
    }

    $defaults = array(
        'type'      => 'all',
        'page'      => '',
        'per_page'  => '',
        'max_depth' => '',
        'cpage'     => null,
    );
    $args = wp_parse_args( $args, $defaults );

    $link = get_permalink( $comment->comment_post_ID );

    // The 'cpage' param takes precedence.
    if ( ! is_null( $args['cpage'] ) ) {
        $cpage = $args['cpage'];

    // No 'cpage' is provided, so we calculate one.
    } else {
        if ( '' === $args['per_page'] && get_option( 'page_comments' ) ) {
            $args['per_page'] = get_option('comments_per_page');
        }

        if ( empty( $args['per_page'] ) ) {
            $args['per_page'] = 0;
            $args['page'] = 0;
        }

        $cpage = $args['page'];

        if ( '' == $cpage ) {
            if ( ! empty( $in_comment_loop ) ) {
                $cpage = get_query_var( 'cpage' );
            } else {
                // Requires a database hit, so we only do it when we can't figure out from context.
                $cpage = get_page_of_comment( $comment->comment_ID, $args );
            }
        }

        /*
         * If the default page displays the oldest comments, the permalinks for comments on the default page
         * do not need a 'cpage' query var.
         */
        if ( 'oldest' === get_option( 'default_comments_page' ) && 1 === $cpage ) {
            $cpage = '';
        }
    }

    if ( $cpage && get_option( 'page_comments' ) ) {
        if ( $wp_rewrite->using_permalinks() ) {
            if ( $cpage ) {
                $link = trailingslashit( $link ) . $wp_rewrite->comments_pagination_base . '-' . $cpage;
            }

            $link = user_trailingslashit( $link, 'comment' );
        } elseif ( $cpage ) {
            $link = add_query_arg( 'cpage', $cpage, $link );
        }

    }

    if ( $wp_rewrite->using_permalinks() ) {
        $link = user_trailingslashit( $link, 'comment' );
    }

    $link = $link . '#comment-' . $comment->comment_ID;

    /**
     * Filters the returned single comment permalink.
     *
     * @since 2.8.0
     * @since 4.4.0 Added the `$cpage` parameter.
     *
     * @see get_page_of_comment()
     *
     * @param string     $link    The comment permalink with '#comment-$id' appended.
     * @param WP_Comment $comment The current comment object.
     * @param array      $args    An array of arguments to override the defaults.
     * @param int        $cpage   The calculated 'cpage' value.
     */
    return apply_filters( 'get_comment_link', $link, $comment, $args, $cpage );
}

/**
 * Retrieves the link to the current post comments.
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global $post.
 * @return string The link to the comments.
 */
function get_comments_link( $post_id = 0 ) {
    $hash = get_comments_number( $post_id ) ? '#comments' : '#respond';
    $comments_link = get_permalink( $post_id ) . $hash;

    /**
     * Filters the returned post comments permalink.
     *
     * @since 3.6.0
     *
     * @param string      $comments_link Post comments permalink with '#comments' appended.
     * @param int|WP_Post $post_id       Post ID or WP_Post object.
     */
    return apply_filters( 'get_comments_link', $comments_link, $post_id );
}

/**
 * Display the link to the current post comments.
 *
 * @since 0.71
 *
 * @param string $deprecated   Not Used.
 * @param string $deprecated_2 Not Used.
 */
function comments_link( $deprecated = '', $deprecated_2 = '' ) {
    if ( !empty( $deprecated ) )
        _deprecated_argument( __FUNCTION__, '0.72' );
    if ( !empty( $deprecated_2 ) )
        _deprecated_argument( __FUNCTION__, '1.3.0' );
    echo esc_url( get_comments_link() );
}

/**
 * Retrieves the amount of comments a post has.
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is the global `$post`.
 * @return string|int If the post exists, a numeric string representing the number of comments
 *                    the post has, otherwise 0.
 */
function get_comments_number( $post_id = 0 ) {
    $post = get_post( $post_id );

    if ( ! $post ) {
        $count = 0;
    } else {
        $count = $post->comment_count;
        $post_id = $post->ID;
    }

    /**
     * Filters the returned comment count for a post.
     *
     * @since 1.5.0
     *
     * @param string|int $count   A string representing the number of comments a post has, otherwise 0.
     * @param int        $post_id Post ID.
     */
    return apply_filters( 'get_comments_number', $count, $post_id );
}

/**
 * Display the language string for the number of comments the current post has.
 *
 * @since 0.71
 *
 * @param string $zero       Optional. Text for no comments. Default false.
 * @param string $one        Optional. Text for one comment. Default false.
 * @param string $more       Optional. Text for more than one comment. Default false.
 * @param string $deprecated Not used.
 */
function comments_number( $zero = false, $one = false, $more = false, $deprecated = '' ) {
    if ( ! empty( $deprecated ) ) {
        _deprecated_argument( __FUNCTION__, '1.3.0' );
    }
    echo get_comments_number_text( $zero, $one, $more );
}

/**
 * Display the language string for the number of comments the current post has.
 *
 * @since 4.0.0
 *
 * @param string $zero Optional. Text for no comments. Default false.
 * @param string $one  Optional. Text for one comment. Default false.
 * @param string $more Optional. Text for more than one comment. Default false.
 */
function get_comments_number_text( $zero = false, $one = false, $more = false ) {
    $number = get_comments_number();

    if ( $number > 1 ) {
        if ( false === $more ) {
            /* translators: %s: number of comments */
            $output = sprintf( _n( '%s Comment', '%s Comments', $number ), number_format_i18n( $number ) );
        } else {
            // % Comments
            /* translators: If comment number in your language requires declension,
             * translate this to 'on'. Do not translate into your own language.
             */
            if ( 'on' === _x( 'off', 'Comment number declension: on or off' ) ) {
                $text = preg_replace( '#<span class="screen-reader-text">.+?</span>#', '', $more );
                $text = preg_replace( '/&.+?;/', '', $text ); // Kill entities
                $text = trim( strip_tags( $text ), '% ' );

                // Replace '% Comments' with a proper plural form
                if ( $text && ! preg_match( '/[0-9]+/', $text ) && false !== strpos( $more, '%' ) ) {
                    /* translators: %s: number of comments */
                    $new_text = _n( '%s Comment', '%s Comments', $number );
                    $new_text = trim( sprintf( $new_text, '' ) );

                    $more = str_replace( $text, $new_text, $more );
                    if ( false === strpos( $more, '%' ) ) {
                        $more = '% ' . $more;
                    }
                }
            }

            $output = str_replace( '%', number_format_i18n( $number ), $more );
        }
    } elseif ( $number == 0 ) {
        $output = ( false === $zero ) ? __( 'No Comments' ) : $zero;
    } else { // must be one
        $output = ( false === $one ) ? __( '1 Comment' ) : $one;
    }
    /**
     * Filters the comments count for display.
     *
     * @since 1.5.0
     *
     * @see _n()
     *
     * @param string $output A translatable string formatted based on whether the count
     *                       is equal to 0, 1, or 1+.
     * @param int    $number The number of post comments.
     */
    return apply_filters( 'comments_number', $output, $number );
}

/**
 * Retrieve the text of the current comment.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @see Walker_Comment::comment()
 *
 * @param int|WP_Comment  $comment_ID WP_Comment or ID of the comment for which to get the text.
 *                                    Default current comment.
 * @param array           $args       Optional. An array of arguments. Default empty.
 * @return string The comment content.
 */
function get_comment_text( $comment_ID = 0, $args = array() ) {
    $comment = get_comment( $comment_ID );

    /**
     * Filters the text of a comment.
     *
     * @since 1.5.0
     *
     * @see Walker_Comment::comment()
     *
     * @param string     $comment_content Text of the comment.
     * @param WP_Comment $comment         The comment object.
     * @param array      $args            An array of arguments.
     */
    return apply_filters( 'get_comment_text', $comment->comment_content, $comment, $args );
}

/**
 * Display the text of the current comment.
 *
 * @since 0.71
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @see Walker_Comment::comment()
 *
 * @param int|WP_Comment  $comment_ID WP_Comment or ID of the comment for which to print the text.
 *                                    Default current comment.
 * @param array           $args       Optional. An array of arguments. Default empty array. Default empty.
 */
function comment_text( $comment_ID = 0, $args = array() ) {
    $comment = get_comment( $comment_ID );

    $comment_text = get_comment_text( $comment, $args );
    /**
     * Filters the text of a comment to be displayed.
     *
     * @since 1.2.0
     *
     * @see Walker_Comment::comment()
     *
     * @param string          $comment_text Text of the current comment.
     * @param WP_Comment|null $comment      The comment object.
     * @param array           $args         An array of arguments.
     */
    echo apply_filters( 'comment_text', $comment_text, $comment, $args );
}

/**
 * Retrieve the comment time of the current comment.
 *
 * @since 1.5.0
 *
 * @param string $d         Optional. The format of the time. Default user's settings.
 * @param bool   $gmt       Optional. Whether to use the GMT date. Default false.
 * @param bool   $translate Optional. Whether to translate the time (for use in feeds).
 *                          Default true.
 * @return string The formatted time.
 */
function get_comment_time( $d = '', $gmt = false, $translate = true ) {
    $comment = get_comment();

    $comment_date = $gmt ? $comment->comment_date_gmt : $comment->comment_date;
    if ( '' == $d )
        $date = mysql2date(get_option('time_format'), $comment_date, $translate);
    else
        $date = mysql2date($d, $comment_date, $translate);

    /**
     * Filters the returned comment time.
     *
     * @since 1.5.0
     *
     * @param string|int $date      The comment time, formatted as a date string or Unix timestamp.
     * @param string     $d         Date format.
     * @param bool       $gmt       Whether the GMT date is in use.
     * @param bool       $translate Whether the time is translated.
     * @param WP_Comment $comment   The comment object.
     */
    return apply_filters( 'get_comment_time', $date, $d, $gmt, $translate, $comment );
}

/**
 * Display the comment time of the current comment.
 *
 * @since 0.71
 *
 * @param string $d Optional. The format of the time. Default user's settings.
 */
function comment_time( $d = '' ) {
    echo get_comment_time($d);
}

/**
 * Retrieve the comment type of the current comment.
 *
 * @since 1.5.0
 * @since 4.4.0 Added the ability for `$comment_ID` to also accept a WP_Comment object.
 *
 * @param int|WP_Comment $comment_ID Optional. WP_Comment or ID of the comment for which to get the type.
 *                                   Default current comment.
 * @return string The comment type.
 */
function get_comment_type( $comment_ID = 0 ) {
    $comment = get_comment( $comment_ID );
    if ( '' == $comment->comment_type )
        $comment->comment_type = 'comment';

    /**
     * Filters the returned comment type.
     *
     * @since 1.5.0
     * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
     *
     * @param string     $comment_type The type of comment, such as 'comment', 'pingback', or 'trackback'.
     * @param int          $comment_ID   The comment ID.
     * @param WP_Comment $comment      The comment object.
     */
    return apply_filters( 'get_comment_type', $comment->comment_type, $comment->comment_ID, $comment );
}

/**
 * Display the comment type of the current comment.
 *
 * @since 0.71
 *
 * @param string $commenttxt   Optional. String to display for comment type. Default false.
 * @param string $trackbacktxt Optional. String to display for trackback type. Default false.
 * @param string $pingbacktxt  Optional. String to display for pingback type. Default false.
 */
function comment_type( $commenttxt = false, $trackbacktxt = false, $pingbacktxt = false ) {
    if ( false === $commenttxt ) $commenttxt = _x( 'Comment', 'noun' );
    if ( false === $trackbacktxt ) $trackbacktxt = __( 'Trackback' );
    if ( false === $pingbacktxt ) $pingbacktxt = __( 'Pingback' );
    $type = get_comment_type();
    switch( $type ) {
        case 'trackback' :
            echo $trackbacktxt;
            break;
        case 'pingback' :
            echo $pingbacktxt;
            break;
        default :
            echo $commenttxt;
    }
}

/**
 * Retrieve The current post's trackback URL.
 *
 * There is a check to see if permalink's have been enabled and if so, will
 * retrieve the pretty path. If permalinks weren't enabled, the ID of the
 * current post is used and appended to the correct page to go to.
 *
 * @since 1.5.0
 *
 * @return string The trackback URL after being filtered.
 */
function get_trackback_url() {
    if ( '' != get_option('permalink_structure') )
        $tb_url = trailingslashit(get_permalink()) . user_trailingslashit('trackback', 'single_trackback');
    else
        $tb_url = get_option('siteurl') . '/wp-trackback.php?p=' . get_the_ID();

    /**
     * Filters the returned trackback URL.
     *
     * @since 2.2.0
     *
     * @param string $tb_url The trackback URL.
     */
    return apply_filters( 'trackback_url', $tb_url );
}

/**
 * Display the current post's trackback URL.
 *
 * @since 0.71
 *
 * @param bool $deprecated_echo Not used.
 * @return void|string Should only be used to echo the trackback URL, use get_trackback_url()
 *                     for the result instead.
 */
function trackback_url( $deprecated_echo = true ) {
    if ( true !== $deprecated_echo ) {
        _deprecated_argument( __FUNCTION__, '2.5.0',
            /* translators: %s: get_trackback_url() */
            sprintf( __( 'Use %s instead if you do not want the value echoed.' ),
                '<code>get_trackback_url()</code>'
            )
        );
    }

    if ( $deprecated_echo ) {
        echo get_trackback_url();
    } else {
        return get_trackback_url();
    }
}

/**
 * Generate and display the RDF for the trackback information of current post.
 *
 * Deprecated in 3.0.0, and restored in 3.0.1.
 *
 * @since 0.71
 *
 * @param int $deprecated Not used (Was $timezone = 0).
 */
function trackback_rdf( $deprecated = '' ) {
    if ( ! empty( $deprecated ) ) {
        _deprecated_argument( __FUNCTION__, '2.5.0' );
    }

    if ( isset( $_SERVER['HTTP_USER_AGENT'] ) && false !== stripos( $_SERVER['HTTP_USER_AGENT'], 'W3C_Validator' ) ) {
        return;
    }

    echo '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
            xmlns:dc="http://purl.org/dc/elements/1.1/"
            xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
        <rdf:Description rdf:about="';
    the_permalink();
    echo '"'."\n";
    echo '    dc:identifier="';
    the_permalink();
    echo '"'."\n";
    echo '    dc:title="'.str_replace('--', '--', wptexturize(strip_tags(get_the_title()))).'"'."\n";
    echo '    trackback:ping="'.get_trackback_url().'"'." />\n";
    echo '</rdf:RDF>';
}

/**
 * Whether the current post is open for comments.
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $post_id Post ID or WP_Post object. Default current post.
 * @return bool True if the comments are open.
 */
function comments_open( $post_id = null ) {

    $_post = get_post($post_id);

    $post_id = $_post ? $_post->ID : 0;
    $open = ( 'open' == $_post->comment_status );

    /**
     * Filters whether the current post is open for comments.
     *
     * @since 2.5.0
     *
     * @param bool $open    Whether the current post is open for comments.
     * @param int  $post_id The post ID.
     */
    return apply_filters( 'comments_open', $open, $post_id );
}

/**
 * Whether the current post is open for pings.
 *
 * @since 1.5.0
 *
 * @param int|WP_Post $post_id Post ID or WP_Post object. Default current post.
 * @return bool True if pings are accepted
 */
function pings_open( $post_id = null ) {

    $_post = get_post($post_id);

    $post_id = $_post ? $_post->ID : 0;
    $open = ( 'open' == $_post->ping_status );

    /**
     * Filters whether the current post is open for pings.
     *
     * @since 2.5.0
     *
     * @param bool $open    Whether the current post is open for pings.
     * @param int  $post_id The post ID.
     */
    return apply_filters( 'pings_open', $open, $post_id );
}

/**
 * Display form token for unfiltered comments.
 *
 * Will only display nonce token if the current user has permissions for
 * unfiltered html. Won't display the token for other users.
 *
 * The function was backported to 2.0.10 and was added to versions 2.1.3 and
 * above. Does not exist in versions prior to 2.0.10 in the 2.0 branch and in
 * the 2.1 branch, prior to 2.1.3. Technically added in 2.2.0.
 *
 * Backported to 2.0.10.
 *
 * @since 2.1.3
 */
function wp_comment_form_unfiltered_html_nonce() {
    $post = get_post();
    $post_id = $post ? $post->ID : 0;

    if ( current_user_can( 'unfiltered_html' ) ) {
        wp_nonce_field( 'unfiltered-html-comment_' . $post_id, '_wp_unfiltered_html_comment_disabled', false );
        echo "<script>(function(){if(window===window.parent){document.getElementById('_wp_unfiltered_html_comment_disabled').name='_wp_unfiltered_html_comment';}})();</script>\n";
    }
}

/**
 * Load the comment template specified in $file.
 *
 * Will not display the comments template if not on single post or page, or if
 * the post does not have comments.
 *
 * Uses the WordPress database object to query for the comments. The comments
 * are passed through the {@see 'comments_array'} filter hook with the list of comments
 * and the post ID respectively.
 *
 * The `$file` path is passed through a filter hook called {@see 'comments_template'},
 * which includes the TEMPLATEPATH and $file combined. Tries the $filtered path
 * first and if it fails it will require the default comment template from the
 * default theme. If either does not exist, then the WordPress process will be
 * halted. It is advised for that reason, that the default theme is not deleted.
 *
 * Will not try to get the comments if the post has none.
 *
 * @since 1.5.0
 *
 * @global WP_Query   $wp_query
 * @global WP_Post    $post
 * @global wpdb       $wpdb
 * @global int        $id
 * @global WP_Comment $comment
 * @global string     $user_login
 * @global int        $user_ID
 * @global string     $user_identity
 * @global bool       $overridden_cpage
 * @global bool       $withcomments
 *
 * @param string $file              Optional. The file to load. Default '/comments.php'.
 * @param bool   $separate_comments Optional. Whether to separate the comments by comment type.
 *                                  Default false.
 */
function comments_template( $file = '/comments.php', $separate_comments = false ) {
    global $wp_query, $withcomments, $post, $wpdb, $id, $comment, $user_login, $user_ID, $user_identity, $overridden_cpage;

    if ( !(is_single() || is_page() || $withcomments) || empty($post) )
        return;

    if ( empty($file) )
        $file = '/comments.php';

    $req = get_option('require_name_email');

    /*
     * Comment author information fetched from the comment cookies.
     */
    $commenter = wp_get_current_commenter();

    /*
     * The name of the current comment author escaped for use in attributes.
     * Escaped by sanitize_comment_cookies().
     */
    $comment_author = $commenter['comment_author'];

    /*
     * The email address of the current comment author escaped for use in attributes.
     * Escaped by sanitize_comment_cookies().
     */
    $comment_author_email = $commenter['comment_author_email'];

    /*
     * The url of the current comment author escaped for use in attributes.
     */
    $comment_author_url = esc_url($commenter['comment_author_url']);

    $comment_args = array(
        'orderby' => 'comment_date_gmt',
        'order' => 'ASC',
        'status'  => 'approve',
        'post_id' => $post->ID,
        'no_found_rows' => false,
        'update_comment_meta_cache' => false, // We lazy-load comment meta for performance.
    );

    if ( get_option('thread_comments') ) {
        $comment_args['hierarchical'] = 'threaded';
    } else {
        $comment_args['hierarchical'] = false;
    }

    if ( $user_ID ) {
        $comment_args['include_unapproved'] = array( $user_ID );
    } elseif ( ! empty( $comment_author_email ) ) {
        $comment_args['include_unapproved'] = array( $comment_author_email );
    }

    $per_page = 0;
    if ( get_option( 'page_comments' ) ) {
        $per_page = (int) get_query_var( 'comments_per_page' );
        if ( 0 === $per_page ) {
            $per_page = (int) get_option( 'comments_per_page' );
        }

        $comment_args['number'] = $per_page;
        $page = (int) get_query_var( 'cpage' );

        if ( $page ) {
            $comment_args['offset'] = ( $page - 1 ) * $per_page;
        } elseif ( 'oldest' === get_option( 'default_comments_page' ) ) {
            $comment_args['offset'] = 0;
        } else {
            // If fetching the first page of 'newest', we need a top-level comment count.
            $top_level_query = new WP_Comment_Query();
            $top_level_args  = array(
                'count'   => true,
                'orderby' => false,
                'post_id' => $post->ID,
                'status'  => 'approve',
            );

            if ( $comment_args['hierarchical'] ) {
                $top_level_args['parent'] = 0;
            }

            if ( isset( $comment_args['include_unapproved'] ) ) {
                $top_level_args['include_unapproved'] = $comment_args['include_unapproved'];
            }

            $top_level_count = $top_level_query->query( $top_level_args );

            $comment_args['offset'] = ( ceil( $top_level_count / $per_page ) - 1 ) * $per_page;
        }
    }

    /**
     * Filters the arguments used to query comments in comments_template().
     *
     * @since 4.5.0
     *
     * @see WP_Comment_Query::__construct()
     *
     * @param array $comment_args {
     *     Array of WP_Comment_Query arguments.
     *
     *     @type string|array $orderby                   Field(s) to order by.
     *     @type string       $order                     Order of results. Accepts 'ASC' or 'DESC'.
     *     @type string       $status                    Comment status.
     *     @type array        $include_unapproved        Array of IDs or email addresses whose unapproved comments
     *                                                   will be included in results.
     *     @type int          $post_id                   ID of the post.
     *     @type bool         $no_found_rows             Whether to refrain from querying for found rows.
     *     @type bool         $update_comment_meta_cache Whether to prime cache for comment meta.
     *     @type bool|string  $hierarchical              Whether to query for comments hierarchically.
     *     @type int          $offset                    Comment offset.
     *     @type int          $number                    Number of comments to fetch.
     * }
     */
    $comment_args = apply_filters( 'comments_template_query_args', $comment_args );
    $comment_query = new WP_Comment_Query( $comment_args );
    $_comments = $comment_query->comments;

    // Trees must be flattened before they're passed to the walker.
    if ( $comment_args['hierarchical'] ) {
        $comments_flat = array();
        foreach ( $_comments as $_comment ) {
            $comments_flat[]  = $_comment;
            $comment_children = $_comment->get_children( array(
                'format' => 'flat',
                'status' => $comment_args['status'],
                'orderby' => $comment_args['orderby']
            ) );

            foreach ( $comment_children as $comment_child ) {
                $comments_flat[] = $comment_child;
            }
        }
    } else {
        $comments_flat = $_comments;
    }

    /**
     * Filters the comments array.
     *
     * @since 2.1.0
     *
     * @param array $comments Array of comments supplied to the comments template.
     * @param int   $post_ID  Post ID.
     */
    $wp_query->comments = apply_filters( 'comments_array', $comments_flat, $post->ID );

    $comments = &$wp_query->comments;
    $wp_query->comment_count = count($wp_query->comments);
    $wp_query->max_num_comment_pages = $comment_query->max_num_pages;

    if ( $separate_comments ) {
        $wp_query->comments_by_type = separate_comments($comments);
        $comments_by_type = &$wp_query->comments_by_type;
    } else {
        $wp_query->comments_by_type = array();
    }

    $overridden_cpage = false;
    if ( '' == get_query_var( 'cpage' ) && $wp_query->max_num_comment_pages > 1 ) {
        set_query_var( 'cpage', 'newest' == get_option('default_comments_page') ? get_comment_pages_count() : 1 );
        $overridden_cpage = true;
    }

    if ( !defined('COMMENTS_TEMPLATE') )
        define('COMMENTS_TEMPLATE', true);

    $theme_template = STYLESHEETPATH . $file;
    /**
     * Filters the path to the theme template file used for the comments template.
     *
     * @since 1.5.1
     *
     * @param string $theme_template The path to the theme template file.
     */
    $include = apply_filters( 'comments_template', $theme_template );
    if ( file_exists( $include ) )
        require( $include );
    elseif ( file_exists( TEMPLATEPATH . $file ) )
        require( TEMPLATEPATH . $file );
    else // Backward compat code will be removed in a future release
        require( ABSPATH . WPINC . '/theme-compat/comments.php');
}

/**
 * Displays the link to the comments for the current post ID.
 *
 * @since 0.71
 *
 * @param string $zero      Optional. String to display when no comments. Default false.
 * @param string $one       Optional. String to display when only one comment is available.
 *                          Default false.
 * @param string $more      Optional. String to display when there are more than one comment.
 *                          Default false.
 * @param string $css_class Optional. CSS class to use for comments. Default empty.
 * @param string $none      Optional. String to display when comments have been turned off.
 *                          Default false.
 */
function comments_popup_link( $zero = false, $one = false, $more = false, $css_class = '', $none = false ) {
    $id = get_the_ID();
    $title = get_the_title();
    $number = get_comments_number( $id );

    if ( false === $zero ) {
        /* translators: %s: post title */
        $zero = sprintf( __( 'No Comments<span class="screen-reader-text"> on %s</span>' ), $title );
    }

    if ( false === $one ) {
        /* translators: %s: post title */
        $one = sprintf( __( '1 Comment<span class="screen-reader-text"> on %s</span>' ), $title );
    }

    if ( false === $more ) {
        /* translators: 1: Number of comments 2: post title */
        $more = _n( '%1$s Comment<span class="screen-reader-text"> on %2$s</span>', '%1$s Comments<span class="screen-reader-text"> on %2$s</span>', $number );
        $more = sprintf( $more, number_format_i18n( $number ), $title );
    }

    if ( false === $none ) {
        /* translators: %s: post title */
        $none = sprintf( __( 'Comments Off<span class="screen-reader-text"> on %s</span>' ), $title );
    }

    if ( 0 == $number && !comments_open() && !pings_open() ) {
        echo '<span' . ((!empty($css_class)) ? ' class="' . esc_attr( $css_class ) . '"' : '') . '>' . $none . '</span>';
        return;
    }

    if ( post_password_required() ) {
        _e( 'Enter your password to view comments.' );
        return;
    }

    echo '<a href="';
    if ( 0 == $number ) {
        $respond_link = get_permalink() . '#respond';
        /**
         * Filters the respond link when a post has no comments.
         *
         * @since 4.4.0
         *
         * @param string $respond_link The default response link.
         * @param integer $id The post ID.
         */
        echo apply_filters( 'respond_link', $respond_link, $id );
    } else {
        comments_link();
    }
    echo '"';

    if ( !empty( $css_class ) ) {
        echo ' class="'.$css_class.'" ';
    }

    $attributes = '';
    /**
     * Filters the comments link attributes for display.
     *
     * @since 2.5.0
     *
     * @param string $attributes The comments link attributes. Default empty.
     */
    echo apply_filters( 'comments_popup_link_attributes', $attributes );

    echo '>';
    comments_number( $zero, $one, $more );
    echo '</a>';
}

/**
 * Retrieve HTML content for reply to comment link.
 *
 * @since 2.7.0
 * @since 4.4.0 Added the ability for `$comment` to also accept a WP_Comment object.
 *
 * @param array $args {
 *     Optional. Override default arguments.
 *
 *     @type string $add_below  The first part of the selector used to identify the comment to respond below.
 *                              The resulting value is passed as the first parameter to addComment.moveForm(),
 *                              concatenated as $add_below-$comment->comment_ID. Default 'comment'.
 *     @type string $respond_id The selector identifying the responding comment. Passed as the third parameter
 *                              to addComment.moveForm(), and appended to the link URL as a hash value.
 *                              Default 'respond'.
 *     @type string $reply_text The text of the Reply link. Default 'Reply'.
 *     @type string $login_text The text of the link to reply if logged out. Default 'Log in to Reply'.
 *     @type int    $max_depth  The max depth of the comment tree. Default 0.
 *     @type int    $depth      The depth of the new comment. Must be greater than 0 and less than the value
 *                              of the 'thread_comments_depth' option set in Settings > Discussion. Default 0.
 *     @type string $before     The text or HTML to add before the reply link. Default empty.
 *     @type string $after      The text or HTML to add after the reply link. Default empty.
 * }
 * @param int|WP_Comment $comment Comment being replied to. Default current comment.
 * @param int|WP_Post    $post    Post ID or WP_Post object the comment is going to be displayed on.
 *                                Default current post.
 * @return void|false|string Link to show comment form, if successful. False, if comments are closed.
 */
function get_comment_reply_link( $args = array(), $comment = null, $post = null ) {
    $defaults = array(
        'add_below'     => 'comment',
        'respond_id'    => 'respond',
        'reply_text'    => __( 'Reply' ),
        /* translators: Comment reply button text. 1: Comment author name */
        'reply_to_text' => __( 'Reply to %s' ),
        'login_text'    => __( 'Log in to Reply' ),
        'max_depth'     => 0,
        'depth'         => 0,
        'before'        => '',
        'after'         => ''
    );

    $args = wp_parse_args( $args, $defaults );

    if ( 0 == $args['depth'] || $args['max_depth'] <= $args['depth'] ) {
        return;
    }

    $comment = get_comment( $comment );

    if ( empty( $post ) ) {
        $post = $comment->comment_post_ID;
    }

    $post = get_post( $post );

    if ( ! comments_open( $post->ID ) ) {
        return false;
    }

    /**
     * Filters the comment reply link arguments.
     *
     * @since 4.1.0
     *
     * @param array      $args    Comment reply link arguments. See get_comment_reply_link()
     *                            for more information on accepted arguments.
     * @param WP_Comment $comment The object of the comment being replied to.
     * @param WP_Post    $post    The WP_Post object.
     */
    $args = apply_filters( 'comment_reply_link_args', $args, $comment, $post );

    if ( get_option( 'comment_registration' ) && ! is_user_logged_in() ) {
        $link = sprintf( '<a rel="nofollow" class="comment-reply-login" href="%s">%s</a>',
            esc_url( wp_login_url( get_permalink() ) ),
            $args['login_text']
        );
    } else {
        $onclick = sprintf( 'return addComment.moveForm( "%1$s-%2$s", "%2$s", "%3$s", "%4$s" )',
            $args['add_below'], $comment->comment_ID, $args['respond_id'], $post->ID
        );

        $link = sprintf( "<a rel='nofollow' class='comment-reply-link' href='%s' onclick='%s' aria-label='%s'>%s</a>",
            esc_url( add_query_arg( 'replytocom', $comment->comment_ID, get_permalink( $post->ID ) ) ) . "#" . $args['respond_id'],
            $onclick,
            esc_attr( sprintf( $args['reply_to_text'], $comment->comment_author ) ),
            $args['reply_text']
        );
    }

    /**
     * Filters the comment reply link.
     *
     * @since 2.7.0
     *
     * @param string  $link    The HTML markup for the comment reply link.
     * @param array   $args    An array of arguments overriding the defaults.
     * @param object  $comment The object of the comment being replied.
     * @param WP_Post $post    The WP_Post object.
     */
    return apply_filters( 'comment_reply_link', $args['before'] . $link . $args['after'], $args, $comment, $post );
}

/**
 * Displays the HTML content for reply to comment link.
 *
 * @since 2.7.0
 *
 * @see get_comment_reply_link()
 *
 * @param array       $args    Optional. Override default options.
 * @param int         $comment Comment being replied to. Default current comment.
 * @param int|WP_Post $post    Post ID or WP_Post object the comment is going to be displayed on.
 *                             Default current post.
 * @return mixed Link to show comment form, if successful. False, if comments are closed.
 */
function comment_reply_link($args = array(), $comment = null, $post = null) {
    echo get_comment_reply_link($args, $comment, $post);
}

/**
 * Retrieve HTML content for reply to post link.
 *
 * @since 2.7.0
 *
 * @param array $args {
 *     Optional. Override default arguments.
 *
 *     @type string $add_below  The first part of the selector used to identify the comment to respond below.
 *                              The resulting value is passed as the first parameter to addComment.moveForm(),
 *                              concatenated as $add_below-$comment->comment_ID. Default is 'post'.
 *     @type string $respond_id The selector identifying the responding comment. Passed as the third parameter
 *                              to addComment.moveForm(), and appended to the link URL as a hash value.
 *                              Default 'respond'.
 *     @type string $reply_text Text of the Reply link. Default is 'Leave a Comment'.
 *     @type string $login_text Text of the link to reply if logged out. Default is 'Log in to leave a Comment'.
 *     @type string $before     Text or HTML to add before the reply link. Default empty.
 *     @type string $after      Text or HTML to add after the reply link. Default empty.
 * }
 * @param int|WP_Post $post    Optional. Post ID or WP_Post object the comment is going to be displayed on.
 *                             Default current post.
 * @return false|null|string Link to show comment form, if successful. False, if comments are closed.
 */
function get_post_reply_link($args = array(), $post = null) {
    $defaults = array(
        'add_below'  => 'post',
        'respond_id' => 'respond',
        'reply_text' => __('Leave a Comment'),
        'login_text' => __('Log in to leave a Comment'),
        'before'     => '',
        'after'      => '',
    );

    $args = wp_parse_args($args, $defaults);

    $post = get_post($post);

    if ( ! comments_open( $post->ID ) ) {
        return false;
    }

    if ( get_option('comment_registration') && ! is_user_logged_in() ) {
        $link = sprintf( '<a rel="nofollow" class="comment-reply-login" href="%s">%s</a>',
            wp_login_url( get_permalink() ),
            $args['login_text']
        );
    } else {
        $onclick = sprintf( 'return addComment.moveForm( "%1$s-%2$s", "0", "%3$s", "%2$s" )',
            $args['add_below'], $post->ID, $args['respond_id']
        );

        $link = sprintf( "<a rel='nofollow' class='comment-reply-link' href='%s' onclick='%s'>%s</a>",
            get_permalink( $post->ID ) . '#' . $args['respond_id'],
            $onclick,
            $args['reply_text']
        );
    }
    $formatted_link = $args['before'] . $link . $args['after'];

    /**
     * Filters the formatted post comments link HTML.
     *
     * @since 2.7.0
     *
     * @param string      $formatted The HTML-formatted post comments link.
     * @param int|WP_Post $post      The post ID or WP_Post object.
     */
    return apply_filters( 'post_comments_link', $formatted_link, $post );
}

/**
 * Displays the HTML content for reply to post link.
 *
 * @since 2.7.0
 *
 * @see get_post_reply_link()
 *
 * @param array       $args Optional. Override default options,
 * @param int|WP_Post $post Post ID or WP_Post object the comment is going to be displayed on.
 *                          Default current post.
 * @return string|bool|null Link to show comment form, if successful. False, if comments are closed.
 */
function post_reply_link($args = array(), $post = null) {
    echo get_post_reply_link($args, $post);
}

/**
 * Retrieve HTML content for cancel comment reply link.
 *
 * @since 2.7.0
 *
 * @param string $text Optional. Text to display for cancel reply link. Default empty.
 * @return string
 */
function get_cancel_comment_reply_link( $text = '' ) {
    if ( empty($text) )
        $text = __('Click here to cancel reply.');

    $style = isset($_GET['replytocom']) ? '' : ' style="display:none;"';
    $link = esc_html( remove_query_arg('replytocom') ) . '#respond';

    $formatted_link = '<a rel="nofollow" id="cancel-comment-reply-link" href="' . $link . '"' . $style . '>' . $text . '</a>';

    /**
     * Filters the cancel comment reply link HTML.
     *
     * @since 2.7.0
     *
     * @param string $formatted_link The HTML-formatted cancel comment reply link.
     * @param string $link           Cancel comment reply link URL.
     * @param string $text           Cancel comment reply link text.
     */
    return apply_filters( 'cancel_comment_reply_link', $formatted_link, $link, $text );
}

/**
 * Display HTML content for cancel comment reply link.
 *
 * @since 2.7.0
 *
 * @param string $text Optional. Text to display for cancel reply link. Default empty.
 */
function cancel_comment_reply_link( $text = '' ) {
    echo get_cancel_comment_reply_link($text);
}

/**
 * Retrieve hidden input HTML for replying to comments.
 *
 * @since 3.0.0
 *
 * @param int $id Optional. Post ID. Default current post ID.
 * @return string Hidden input HTML for replying to comments
 */
function get_comment_id_fields( $id = 0 ) {
    if ( empty( $id ) )
        $id = get_the_ID();

    $replytoid = isset($_GET['replytocom']) ? (int) $_GET['replytocom'] : 0;
    $result  = "<input type='hidden' name='comment_post_ID' value='$id' id='comment_post_ID' />\n";
    $result .= "<input type='hidden' name='comment_parent' id='comment_parent' value='$replytoid' />\n";

    /**
     * Filters the returned comment id fields.
     *
     * @since 3.0.0
     *
     * @param string $result    The HTML-formatted hidden id field comment elements.
     * @param int    $id        The post ID.
     * @param int    $replytoid The id of the comment being replied to.
     */
    return apply_filters( 'comment_id_fields', $result, $id, $replytoid );
}

/**
 * Output hidden input HTML for replying to comments.
 *
 * @since 2.7.0
 *
 * @param int $id Optional. Post ID. Default current post ID.
 */
function comment_id_fields( $id = 0 ) {
    echo get_comment_id_fields( $id );
}

/**
 * Display text based on comment reply status.
 *
 * Only affects users with JavaScript disabled.
 *
 * @internal The $comment global must be present to allow template tags access to the current
 *           comment. See https://core.trac.wordpress.org/changeset/36512.
 *
 * @since 2.7.0
 *
 * @global WP_Comment $comment Current comment.
 *
 * @param string $noreplytext  Optional. Text to display when not replying to a comment.
 *                             Default false.
 * @param string $replytext    Optional. Text to display when replying to a comment.
 *                             Default false. Accepts "%s" for the author of the comment
 *                             being replied to.
 * @param string $linktoparent Optional. Boolean to control making the author's name a link
 *                             to their comment. Default true.
 */
function comment_form_title( $noreplytext = false, $replytext = false, $linktoparent = true ) {
    global $comment;

    if ( false === $noreplytext ) $noreplytext = __( 'Leave a Reply' );
    if ( false === $replytext ) $replytext = __( 'Leave a Reply to %s' );

    $replytoid = isset($_GET['replytocom']) ? (int) $_GET['replytocom'] : 0;

    if ( 0 == $replytoid )
        echo $noreplytext;
    else {
        // Sets the global so that template tags can be used in the comment form.
        $comment = get_comment($replytoid);
        $author = ( $linktoparent ) ? '<a href="#comment-' . get_comment_ID() . '">' . get_comment_author( $comment ) . '</a>' : get_comment_author( $comment );
        printf( $replytext, $author );
    }
}

/**
 * List comments.
 *
 * Used in the comments.php template to list comments for a particular post.
 *
 * @since 2.7.0
 *
 * @see WP_Query->comments
 *
 * @global WP_Query $wp_query
 * @global int      $comment_alt
 * @global int      $comment_depth
 * @global int      $comment_thread_alt
 * @global bool     $overridden_cpage
 * @global bool     $in_comment_loop
 *
 * @param string|array $args {
 *     Optional. Formatting options.
 *
 *     @type object $walker            Instance of a Walker class to list comments. Default null.
 *     @type int    $max_depth         The maximum comments depth. Default empty.
 *     @type string $style             The style of list ordering. Default 'ul'. Accepts 'ul', 'ol'.
 *     @type string $callback          Callback function to use. Default null.
 *     @type string $end-callback      Callback function to use at the end. Default null.
 *     @type string $type              Type of comments to list.
 *                                     Default 'all'. Accepts 'all', 'comment', 'pingback', 'trackback', 'pings'.
 *     @type int    $page              Page ID to list comments for. Default empty.
 *     @type int    $per_page          Number of comments to list per page. Default empty.
 *     @type int    $avatar_size       Height and width dimensions of the avatar size. Default 32.
 *     @type bool   $reverse_top_level Ordering of the listed comments. If true, will display newest comments first.
 *     @type bool   $reverse_children  Whether to reverse child comments in the list. Default null.
 *     @type string $format            How to format the comments list.
 *                                     Default 'html5' if the theme supports it. Accepts 'html5', 'xhtml'.
 *     @type bool   $short_ping        Whether to output short pings. Default false.
 *     @type bool   $echo              Whether to echo the output or return it. Default true.
 * }
 * @param array $comments Optional. Array of WP_Comment objects.
 */
function wp_list_comments( $args = array(), $comments = null ) {
    global $wp_query, $comment_alt, $comment_depth, $comment_thread_alt, $overridden_cpage, $in_comment_loop;

    $in_comment_loop = true;

    $comment_alt = $comment_thread_alt = 0;
    $comment_depth = 1;

    $defaults = array(
        'walker'            => null,
        'max_depth'         => '',
        'style'             => 'ul',
        'callback'          => null,
        'end-callback'      => null,
        'type'              => 'all',
        'page'              => '',
        'per_page'          => '',
        'avatar_size'       => 32,
        'reverse_top_level' => null,
        'reverse_children'  => '',
        'format'            => current_theme_supports( 'html5', 'comment-list' ) ? 'html5' : 'xhtml',
        'short_ping'        => false,
        'echo'              => true,
    );

    $r = wp_parse_args( $args, $defaults );

    /**
     * Filters the arguments used in retrieving the comment list.
     *
     * @since 4.0.0
     *
     * @see wp_list_comments()
     *
     * @param array $r An array of arguments for displaying comments.
     */
    $r = apply_filters( 'wp_list_comments_args', $r );

    // Figure out what comments we'll be looping through ($_comments)
    if ( null !== $comments ) {
        $comments = (array) $comments;
        if ( empty($comments) )
            return;
        if ( 'all' != $r['type'] ) {
            $comments_by_type = separate_comments($comments);
            if ( empty($comments_by_type[$r['type']]) )
                return;
            $_comments = $comments_by_type[$r['type']];
        } else {
            $_comments = $comments;
        }
    } else {
        /*
         * If 'page' or 'per_page' has been passed, and does not match what's in $wp_query,
         * perform a separate comment query and allow Walker_Comment to paginate.
         */
        if ( $r['page'] || $r['per_page'] ) {
            $current_cpage = get_query_var( 'cpage' );
            if ( ! $current_cpage ) {
                $current_cpage = 'newest' === get_option( 'default_comments_page' ) ? 1 : $wp_query->max_num_comment_pages;
            }

            $current_per_page = get_query_var( 'comments_per_page' );
            if ( $r['page'] != $current_cpage || $r['per_page'] != $current_per_page ) {
                $comment_args = array(
                    'post_id' => get_the_ID(),
                    'orderby' => 'comment_date_gmt',
                    'order' => 'ASC',
                    'status' => 'approve',
                );

                if ( is_user_logged_in() ) {
                    $comment_args['include_unapproved'] = get_current_user_id();
                } else {
                    $commenter = wp_get_current_commenter();
                    if ( $commenter['comment_author_email'] ) {
                        $comment_args['include_unapproved'] = $commenter['comment_author_email'];
                    }
                }

                $comments = get_comments( $comment_args );

                if ( 'all' != $r['type'] ) {
                    $comments_by_type = separate_comments( $comments );
                    if ( empty( $comments_by_type[ $r['type'] ] ) ) {
                        return;
                    }

                    $_comments = $comments_by_type[ $r['type'] ];
                } else {
                    $_comments = $comments;
                }
            }

        // Otherwise, fall back on the comments from `$wp_query->comments`.
        } else {
            if ( empty($wp_query->comments) )
                return;
            if ( 'all' != $r['type'] ) {
                if ( empty($wp_query->comments_by_type) )
                    $wp_query->comments_by_type = separate_comments($wp_query->comments);
                if ( empty($wp_query->comments_by_type[$r['type']]) )
                    return;
                $_comments = $wp_query->comments_by_type[$r['type']];
            } else {
                $_comments = $wp_query->comments;
            }

            if ( $wp_query->max_num_comment_pages ) {
                $default_comments_page = get_option( 'default_comments_page' );
                $cpage = get_query_var( 'cpage' );
                if ( 'newest' === $default_comments_page ) {
                    $r['cpage'] = $cpage;

                /*
                 * When first page shows oldest comments, post permalink is the same as
                 * the comment permalink.
                 */
                } elseif ( $cpage == 1 ) {
                    $r['cpage'] = '';
                } else {
                    $r['cpage'] = $cpage;
                }

                $r['page'] = 0;
                $r['per_page'] = 0;
            }
        }
    }

    if ( '' === $r['per_page'] && get_option( 'page_comments' ) ) {
        $r['per_page'] = get_query_var('comments_per_page');
    }

    if ( empty($r['per_page']) ) {
        $r['per_page'] = 0;
        $r['page'] = 0;
    }

    if ( '' === $r['max_depth'] ) {
        if ( get_option('thread_comments') )
            $r['max_depth'] = get_option('thread_comments_depth');
        else
            $r['max_depth'] = -1;
    }

    if ( '' === $r['page'] ) {
        if ( empty($overridden_cpage) ) {
            $r['page'] = get_query_var('cpage');
        } else {
            $threaded = ( -1 != $r['max_depth'] );
            $r['page'] = ( 'newest' == get_option('default_comments_page') ) ? get_comment_pages_count($_comments, $r['per_page'], $threaded) : 1;
            set_query_var( 'cpage', $r['page'] );
        }
    }
    // Validation check
    $r['page'] = intval($r['page']);
    if ( 0 == $r['page'] && 0 != $r['per_page'] )
        $r['page'] = 1;

    if ( null === $r['reverse_top_level'] )
        $r['reverse_top_level'] = ( 'desc' == get_option('comment_order') );

    wp_queue_comments_for_comment_meta_lazyload( $_comments );

    if ( empty( $r['walker'] ) ) {
        $walker = new Walker_Comment;
    } else {
        $walker = $r['walker'];
    }

    $output = $walker->paged_walk( $_comments, $r['max_depth'], $r['page'], $r['per_page'], $r );

    $in_comment_loop = false;

    if ( $r['echo'] ) {
        echo $output;
    } else {
        return $output;
    }
}

/**
 * Outputs a complete commenting form for use within a template.
 *
 * Most strings and form fields may be controlled through the $args array passed
 * into the function, while you may also choose to use the {@see 'comment_form_default_fields'}
 * filter to modify the array of default fields if you'd just like to add a new
 * one or remove a single field. All fields are also individually passed through
 * a filter of the {@see 'comment_form_field_$name'} where $name is the key used
 * in the array of fields.
 *
 * @since 3.0.0
 * @since 4.1.0 Introduced the 'class_submit' argument.
 * @since 4.2.0 Introduced the 'submit_button' and 'submit_fields' arguments.
 * @since 4.4.0 Introduced the 'class_form', 'title_reply_before', 'title_reply_after',
 *              'cancel_reply_before', and 'cancel_reply_after' arguments.
 * @since 4.5.0 The 'author', 'email', and 'url' form fields are limited to 245, 100,
 *              and 200 characters, respectively.
 * @since 4.6.0 Introduced the 'action' argument.
 *
 * @param array       $args {
 *     Optional. Default arguments and form fields to override.
 *
 *     @type array $fields {
 *         Default comment fields, filterable by default via the {@see 'comment_form_default_fields'} hook.
 *
 *         @type string $author Comment author field HTML.
 *         @type string $email  Comment author email field HTML.
 *         @type string $url    Comment author URL field HTML.
 *     }
 *     @type string $comment_field        The comment textarea field HTML.
 *     @type string $must_log_in          HTML element for a 'must be logged in to comment' message.
 *     @type string $logged_in_as         HTML element for a 'logged in as [user]' message.
 *     @type string $comment_notes_before HTML element for a message displayed before the comment fields
 *                                        if the user is not logged in.
 *                                        Default 'Your email address will not be published.'.
 *     @type string $comment_notes_after  HTML element for a message displayed after the textarea field.
 *     @type string $action               The comment form element action attribute. Default '/wp-comments-post.php'.
 *     @type string $id_form              The comment form element id attribute. Default 'commentform'.
 *     @type string $id_submit            The comment submit element id attribute. Default 'submit'.
 *     @type string $class_form           The comment form element class attribute. Default 'comment-form'.
 *     @type string $class_submit         The comment submit element class attribute. Default 'submit'.
 *     @type string $name_submit          The comment submit element name attribute. Default 'submit'.
 *     @type string $title_reply          The translatable 'reply' button label. Default 'Leave a Reply'.
 *     @type string $title_reply_to       The translatable 'reply-to' button label. Default 'Leave a Reply to %s',
 *                                        where %s is the author of the comment being replied to.
 *     @type string $title_reply_before   HTML displayed before the comment form title.
 *                                        Default: '<h3 id="reply-title" class="comment-reply-title">'.
 *     @type string $title_reply_after    HTML displayed after the comment form title.
 *                                        Default: '</h3>'.
 *     @type string $cancel_reply_before  HTML displayed before the cancel reply link.
 *     @type string $cancel_reply_after   HTML displayed after the cancel reply link.
 *     @type string $cancel_reply_link    The translatable 'cancel reply' button label. Default 'Cancel reply'.
 *     @type string $label_submit         The translatable 'submit' button label. Default 'Post a comment'.
 *     @type string $submit_button        HTML format for the Submit button.
 *                                        Default: '<input name="%1$s" type="submit" id="%2$s" class="%3$s" value="%4$s" />'.
 *     @type string $submit_field         HTML format for the markup surrounding the Submit button and comment hidden
 *                                        fields. Default: '<p class="form-submit">%1$s %2$s</p>', where %1$s is the
 *                                        submit button markup and %2$s is the comment hidden fields.
 *     @type string $format               The comment form format. Default 'xhtml'. Accepts 'xhtml', 'html5'.
 * }
 * @param int|WP_Post $post_id Post ID or WP_Post object to generate the form for. Default current post.
 */
function comment_form( $args = array(), $post_id = null ) {
    if ( null === $post_id )
        $post_id = get_the_ID();

    // Exit the function when comments for the post are closed.
    if ( ! comments_open( $post_id ) ) {
        /**
         * Fires after the comment form if comments are closed.
         *
         * @since 3.0.0
         */
        do_action( 'comment_form_comments_closed' );

        return;
    }

    $commenter = wp_get_current_commenter();
    $user = wp_get_current_user();
    $user_identity = $user->exists() ? $user->display_name : '';

    $args = wp_parse_args( $args );
    if ( ! isset( $args['format'] ) )
        $args['format'] = current_theme_supports( 'html5', 'comment-form' ) ? 'html5' : 'xhtml';

    $req      = get_option( 'require_name_email' );
    $aria_req = ( $req ? " aria-required='true'" : '' );
    $html_req = ( $req ? " required='required'" : '' );
    $html5    = 'html5' === $args['format'];
    $fields   =  array(
        'author' => '<p class="comment-form-author">' . '<label for="author">' . __( 'Name' ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
                    '<input id="author" name="author" type="text" value="' . esc_attr( $commenter['comment_author'] ) . '" size="30" maxlength="245"' . $aria_req . $html_req . ' /></p>',
        'email'  => '<p class="comment-form-email"><label for="email">' . __( 'Email' ) . ( $req ? ' <span class="required">*</span>' : '' ) . '</label> ' .
                    '<input id="email" name="email" ' . ( $html5 ? 'type="email"' : 'type="text"' ) . ' value="' . esc_attr(  $commenter['comment_author_email'] ) . '" size="30" maxlength="100" aria-describedby="email-notes"' . $aria_req . $html_req  . ' /></p>',
        'url'    => '<p class="comment-form-url"><label for="url">' . __( 'Website' ) . '</label> ' .
                    '<input id="url" name="url" ' . ( $html5 ? 'type="url"' : 'type="text"' ) . ' value="' . esc_attr( $commenter['comment_author_url'] ) . '" size="30" maxlength="200" /></p>',
    );

    $required_text = sprintf( ' ' . __('Required fields are marked %s'), '<span class="required">*</span>' );

    /**
     * Filters the default comment form fields.
     *
     * @since 3.0.0
     *
     * @param array $fields The default comment fields.
     */
    $fields = apply_filters( 'comment_form_default_fields', $fields );
    $defaults = array(
        'fields'               => $fields,
        'comment_field'        => '<p class="comment-form-comment"><label for="comment">' . _x( 'Comment', 'noun' ) . '</label> <textarea id="comment" name="comment" cols="45" rows="8" maxlength="65525" aria-required="true" required="required"></textarea></p>',
        /** This filter is documented in wp-includes/link-template.php */
        'must_log_in'          => '<p class="must-log-in">' . sprintf(
                                      /* translators: %s: login URL */
                                      __( 'You must be <a href="%s">logged in</a> to post a comment.' ),
                                      wp_login_url( apply_filters( 'the_permalink', get_permalink( $post_id ), $post_id ) )
                                  ) . '</p>',
        /** This filter is documented in wp-includes/link-template.php */
        'logged_in_as'         => '<p class="logged-in-as">' . sprintf(
                                      /* translators: 1: edit user link, 2: accessibility text, 3: user name, 4: logout URL */
                                      __( '<a href="%1$s" aria-label="%2$s">Logged in as %3$s</a>. <a href="%4$s">Log out?</a>' ),
                                      get_edit_user_link(),
                                      /* translators: %s: user name */
                                      esc_attr( sprintf( __( 'Logged in as %s. Edit your profile.' ), $user_identity ) ),
                                      $user_identity,
                                      wp_logout_url( apply_filters( 'the_permalink', get_permalink( $post_id ), $post_id ) )
                                  ) . '</p>',
        'comment_notes_before' => '<p class="comment-notes"><span id="email-notes">' . __( 'Your email address will not be published.' ) . '</span>'. ( $req ? $required_text : '' ) . '</p>',
        'comment_notes_after'  => '',
        'action'               => site_url( '/wp-comments-post.php' ),
        'id_form'              => 'commentform',
        'id_submit'            => 'submit',
        'class_form'           => 'comment-form',
        'class_submit'         => 'submit',
        'name_submit'          => 'submit',
        'title_reply'          => __( 'Leave a Reply' ),
        'title_reply_to'       => __( 'Leave a Reply to %s' ),
        'title_reply_before'   => '<h3 id="reply-title" class="comment-reply-title">',
        'title_reply_after'    => '</h3>',
        'cancel_reply_before'  => ' <small>',
        'cancel_reply_after'   => '</small>',
        'cancel_reply_link'    => __( 'Cancel reply' ),
        'label_submit'         => __( 'Post Comment' ),
        'submit_button'        => '<input name="%1$s" type="submit" id="%2$s" class="%3$s" value="%4$s" />',
        'submit_field'         => '<p class="form-submit">%1$s %2$s</p>',
        'format'               => 'xhtml',
    );

    /**
     * Filters the comment form default arguments.
     *
     * Use {@see 'comment_form_default_fields'} to filter the comment fields.
     *
     * @since 3.0.0
     *
     * @param array $defaults The default comment form arguments.
     */
    $args = wp_parse_args( $args, apply_filters( 'comment_form_defaults', $defaults ) );

    // Ensure that the filtered args contain all required default values.
    $args = array_merge( $defaults, $args );

    /**
     * Fires before the comment form.
     *
     * @since 3.0.0
     */
    do_action( 'comment_form_before' );
    ?>
    <div id="respond" class="comment-respond">
        <?php
        echo $args['title_reply_before'];

        comment_form_title( $args['title_reply'], $args['title_reply_to'] );

        echo $args['cancel_reply_before'];

        cancel_comment_reply_link( $args['cancel_reply_link'] );

        echo $args['cancel_reply_after'];

        echo $args['title_reply_after'];

        if ( get_option( 'comment_registration' ) && !is_user_logged_in() ) :
            echo $args['must_log_in'];
            /**
             * Fires after the HTML-formatted 'must log in after' message in the comment form.
             *
             * @since 3.0.0
             */
            do_action( 'comment_form_must_log_in_after' );
        else : ?>
            <form action="<?php echo esc_url( $args['action'] ); ?>" method="post" id="<?php echo esc_attr( $args['id_form'] ); ?>" class="<?php echo esc_attr( $args['class_form'] ); ?>"<?php echo $html5 ? ' novalidate' : ''; ?>>
                <?php
                /**
                 * Fires at the top of the comment form, inside the form tag.
                 *
                 * @since 3.0.0
                 */
                do_action( 'comment_form_top' );

                if ( is_user_logged_in() ) :
                    /**
                     * Filters the 'logged in' message for the comment form for display.
                     *
                     * @since 3.0.0
                     *
                     * @param string $args_logged_in The logged-in-as HTML-formatted message.
                     * @param array  $commenter      An array containing the comment author's
                     *                               username, email, and URL.
                     * @param string $user_identity  If the commenter is a registered user,
                     *                               the display name, blank otherwise.
                     */
                    echo apply_filters( 'comment_form_logged_in', $args['logged_in_as'], $commenter, $user_identity );

                    /**
                     * Fires after the is_user_logged_in() check in the comment form.
                     *
                     * @since 3.0.0
                     *
                     * @param array  $commenter     An array containing the comment author's
                     *                              username, email, and URL.
                     * @param string $user_identity If the commenter is a registered user,
                     *                              the display name, blank otherwise.
                     */
                    do_action( 'comment_form_logged_in_after', $commenter, $user_identity );

                else :

                    echo $args['comment_notes_before'];

                endif;

                // Prepare an array of all fields, including the textarea
                $comment_fields = array( 'comment' => $args['comment_field'] ) + (array) $args['fields'];

                /**
                 * Filters the comment form fields, including the textarea.
                 *
                 * @since 4.4.0
                 *
                 * @param array $comment_fields The comment fields.
                 */
                $comment_fields = apply_filters( 'comment_form_fields', $comment_fields );

                // Get an array of field names, excluding the textarea
                $comment_field_keys = array_diff( array_keys( $comment_fields ), array( 'comment' ) );

                // Get the first and the last field name, excluding the textarea
                $first_field = reset( $comment_field_keys );
                $last_field  = end( $comment_field_keys );

                foreach ( $comment_fields as $name => $field ) {

                    if ( 'comment' === $name ) {

                        /**
                         * Filters the content of the comment textarea field for display.
                         *
                         * @since 3.0.0
                         *
                         * @param string $args_comment_field The content of the comment textarea field.
                         */
                        echo apply_filters( 'comment_form_field_comment', $field );

                        echo $args['comment_notes_after'];

                    } elseif ( ! is_user_logged_in() ) {

                        if ( $first_field === $name ) {
                            /**
                             * Fires before the comment fields in the comment form, excluding the textarea.
                             *
                             * @since 3.0.0
                             */
                            do_action( 'comment_form_before_fields' );
                        }

                        /**
                         * Filters a comment form field for display.
                         *
                         * The dynamic portion of the filter hook, `$name`, refers to the name
                         * of the comment form field. Such as 'author', 'email', or 'url'.
                         *
                         * @since 3.0.0
                         *
                         * @param string $field The HTML-formatted output of the comment form field.
                         */
                        echo apply_filters( "comment_form_field_{$name}", $field ) . "\n";

                        if ( $last_field === $name ) {
                            /**
                             * Fires after the comment fields in the comment form, excluding the textarea.
                             *
                             * @since 3.0.0
                             */
                            do_action( 'comment_form_after_fields' );
                        }
                    }
                }

                $submit_button = sprintf(
                    $args['submit_button'],
                    esc_attr( $args['name_submit'] ),
                    esc_attr( $args['id_submit'] ),
                    esc_attr( $args['class_submit'] ),
                    esc_attr( $args['label_submit'] )
                );

                /**
                 * Filters the submit button for the comment form to display.
                 *
                 * @since 4.2.0
                 *
                 * @param string $submit_button HTML markup for the submit button.
                 * @param array  $args          Arguments passed to `comment_form()`.
                 */
                $submit_button = apply_filters( 'comment_form_submit_button', $submit_button, $args );

                $submit_field = sprintf(
                    $args['submit_field'],
                    $submit_button,
                    get_comment_id_fields( $post_id )
                );

                /**
                 * Filters the submit field for the comment form to display.
                 *
                 * The submit field includes the submit button, hidden fields for the
                 * comment form, and any wrapper markup.
                 *
                 * @since 4.2.0
                 *
                 * @param string $submit_field HTML markup for the submit field.
                 * @param array  $args         Arguments passed to comment_form().
                 */
                echo apply_filters( 'comment_form_submit_field', $submit_field, $args );

                /**
                 * Fires at the bottom of the comment form, inside the closing </form> tag.
                 *
                 * @since 1.5.0
                 *
                 * @param int $post_id The post ID.
                 */
                do_action( 'comment_form', $post_id );
                ?>
            </form>
        <?php endif; ?>
    </div><!-- #respond -->
    <?php

    /**
     * Fires after the comment form.
     *
     * @since 3.0.0
     */
    do_action( 'comment_form_after' );
}