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

PHP Script | 2017-10-23 | 101.9 KB | 3,148 lines

<?php
/**
 * Core Comment API
 *
 * @package WordPress
 * @subpackage Comment
 */

/**
 * Check whether a comment passes internal checks to be allowed to add.
 *
 * If manual comment moderation is set in the administration, then all checks,
 * regardless of their type and whitelist, will fail and the function will
 * return false.
 *
 * If the number of links exceeds the amount in the administration, then the
 * check fails. If any of the parameter contents match the blacklist of words,
 * then the check fails.
 *
 * If the comment author was approved before, then the comment is automatically
 * whitelisted.
 *
 * If all checks pass, the function will return true.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $author       Comment author name.
 * @param string $email        Comment author email.
 * @param string $url          Comment author URL.
 * @param string $comment      Content of the comment.
 * @param string $user_ip      Comment author IP address.
 * @param string $user_agent   Comment author User-Agent.
 * @param string $comment_type Comment type, either user-submitted comment,
 *                               trackback, or pingback.
 * @return bool If all checks pass, true, otherwise false.
 */
function check_comment($author, $email, $url, $comment, $user_ip, $user_agent, $comment_type) {
    global $wpdb;

    // If manual moderation is enabled, skip all checks and return false.
    if ( 1 == get_option('comment_moderation') )
        return false;

    /** This filter is documented in wp-includes/comment-template.php */
    $comment = apply_filters( 'comment_text', $comment, null, array() );

    // Check for the number of external links if a max allowed number is set.
    if ( $max_links = get_option( 'comment_max_links' ) ) {
        $num_links = preg_match_all( '/<a [^>]*href/i', $comment, $out );

        /**
         * Filters the number of links found in a comment.
         *
         * @since 3.0.0
         * @since 4.7.0 Added the `$comment` parameter.
         *
         * @param int    $num_links The number of links found.
         * @param string $url       Comment author's URL. Included in allowed links total.
         * @param string $comment   Content of the comment.
         */
        $num_links = apply_filters( 'comment_max_links_url', $num_links, $url, $comment );

        /*
         * If the number of links in the comment exceeds the allowed amount,
         * fail the check by returning false.
         */
        if ( $num_links >= $max_links )
            return false;
    }

    $mod_keys = trim(get_option('moderation_keys'));

    // If moderation 'keys' (keywords) are set, process them.
    if ( !empty($mod_keys) ) {
        $words = explode("\n", $mod_keys );

        foreach ( (array) $words as $word) {
            $word = trim($word);

            // Skip empty lines.
            if ( empty($word) )
                continue;

            /*
             * Do some escaping magic so that '#' (number of) characters in the spam
             * words don't break things:
             */
            $word = preg_quote($word, '#');

            /*
             * Check the comment fields for moderation keywords. If any are found,
             * fail the check for the given field by returning false.
             */
            $pattern = "#$word#i";
            if ( preg_match($pattern, $author) ) return false;
            if ( preg_match($pattern, $email) ) return false;
            if ( preg_match($pattern, $url) ) return false;
            if ( preg_match($pattern, $comment) ) return false;
            if ( preg_match($pattern, $user_ip) ) return false;
            if ( preg_match($pattern, $user_agent) ) return false;
        }
    }

    /*
     * Check if the option to approve comments by previously-approved authors is enabled.
     *
     * If it is enabled, check whether the comment author has a previously-approved comment,
     * as well as whether there are any moderation keywords (if set) present in the author
     * email address. If both checks pass, return true. Otherwise, return false.
     */
    if ( 1 == get_option('comment_whitelist')) {
        if ( 'trackback' != $comment_type && 'pingback' != $comment_type && $author != '' && $email != '' ) {
            $comment_user = get_user_by( 'email', wp_unslash( $email ) );
            if ( ! empty( $comment_user->ID ) ) {
                $ok_to_comment = $wpdb->get_var( $wpdb->prepare( "SELECT comment_approved FROM $wpdb->comments WHERE user_id = %d AND comment_approved = '1' LIMIT 1", $comment_user->ID ) );
            } else {
                // expected_slashed ($author, $email)
                $ok_to_comment = $wpdb->get_var( $wpdb->prepare( "SELECT comment_approved FROM $wpdb->comments WHERE comment_author = %s AND comment_author_email = %s and comment_approved = '1' LIMIT 1", $author, $email ) );
            }
            if ( ( 1 == $ok_to_comment ) &&
                ( empty($mod_keys) || false === strpos( $email, $mod_keys) ) )
                    return true;
            else
                return false;
        } else {
            return false;
        }
    }
    return true;
}

/**
 * Retrieve the approved comments for post $post_id.
 *
 * @since 2.0.0
 * @since 4.1.0 Refactored to leverage WP_Comment_Query over a direct query.
 *
 * @param  int   $post_id The ID of the post.
 * @param  array $args    Optional. See WP_Comment_Query::__construct() for information on accepted arguments.
 * @return int|array $comments The approved comments, or number of comments if `$count`
 *                             argument is true.
 */
function get_approved_comments( $post_id, $args = array() ) {
    if ( ! $post_id ) {
        return array();
    }

    $defaults = array(
        'status'  => 1,
        'post_id' => $post_id,
        'order'   => 'ASC',
    );
    $r = wp_parse_args( $args, $defaults );

    $query = new WP_Comment_Query;
    return $query->query( $r );
}

/**
 * Retrieves comment data given a comment ID or comment object.
 *
 * If an object is passed then the comment data will be cached and then returned
 * after being passed through a filter. If the comment is empty, then the global
 * comment variable will be used, if it is set.
 *
 * @since 2.0.0
 *
 * @global WP_Comment $comment
 *
 * @param WP_Comment|string|int $comment Comment to retrieve.
 * @param string                $output  Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                       a WP_Comment object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @return WP_Comment|array|null Depends on $output value.
 */
function get_comment( &$comment = null, $output = OBJECT ) {
    if ( empty( $comment ) && isset( $GLOBALS['comment'] ) ) {
        $comment = $GLOBALS['comment'];
    }

    if ( $comment instanceof WP_Comment ) {
        $_comment = $comment;
    } elseif ( is_object( $comment ) ) {
        $_comment = new WP_Comment( $comment );
    } else {
        $_comment = WP_Comment::get_instance( $comment );
    }

    if ( ! $_comment ) {
        return null;
    }

    /**
     * Fires after a comment is retrieved.
     *
     * @since 2.3.0
     *
     * @param mixed $_comment Comment data.
     */
    $_comment = apply_filters( 'get_comment', $_comment );

    if ( $output == OBJECT ) {
        return $_comment;
    } elseif ( $output == ARRAY_A ) {
        return $_comment->to_array();
    } elseif ( $output == ARRAY_N ) {
        return array_values( $_comment->to_array() );
    }
    return $_comment;
}

/**
 * Retrieve a list of comments.
 *
 * The comment list can be for the blog as a whole or for an individual post.
 *
 * @since 2.7.0
 *
 * @param string|array $args Optional. Array or string of arguments. See WP_Comment_Query::__construct()
 *                           for information on accepted arguments. Default empty.
 * @return int|array List of comments or number of found comments if `$count` argument is true.
 */
function get_comments( $args = '' ) {
    $query = new WP_Comment_Query;
    return $query->query( $args );
}

/**
 * Retrieve all of the WordPress supported comment statuses.
 *
 * Comments have a limited set of valid status values, this provides the comment
 * status values and descriptions.
 *
 * @since 2.7.0
 *
 * @return array List of comment statuses.
 */
function get_comment_statuses() {
    $status = array(
        'hold'        => __( 'Unapproved' ),
        'approve'    => _x( 'Approved', 'comment status' ),
        'spam'        => _x( 'Spam', 'comment status' ),
        'trash'        => _x( 'Trash', 'comment status' ),
    );

    return $status;
}

/**
 * Gets the default comment status for a post type.
 *
 * @since 4.3.0
 *
 * @param string $post_type    Optional. Post type. Default 'post'.
 * @param string $comment_type Optional. Comment type. Default 'comment'.
 * @return string Expected return value is 'open' or 'closed'.
 */
function get_default_comment_status( $post_type = 'post', $comment_type = 'comment' ) {
    switch ( $comment_type ) {
        case 'pingback' :
        case 'trackback' :
            $supports = 'trackbacks';
            $option = 'ping';
            break;
        default :
            $supports = 'comments';
            $option = 'comment';
    }

    // Set the status.
    if ( 'page' === $post_type ) {
        $status = 'closed';
    } elseif ( post_type_supports( $post_type, $supports ) ) {
        $status = get_option( "default_{$option}_status" );
    } else {
        $status = 'closed';
    }

    /**
     * Filters the default comment status for the given post type.
     *
     * @since 4.3.0
     *
     * @param string $status       Default status for the given post type,
     *                             either 'open' or 'closed'.
     * @param string $post_type    Post type. Default is `post`.
     * @param string $comment_type Type of comment. Default is `comment`.
     */
    return apply_filters( 'get_default_comment_status' , $status, $post_type, $comment_type );
}

/**
 * The date the last comment was modified.
 *
 * @since 1.5.0
 * @since 4.7.0 Replaced caching the modified date in a local static variable
 *              with the Object Cache API.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $timezone Which timezone to use in reference to 'gmt', 'blog', or 'server' locations.
 * @return string|false Last comment modified date on success, false on failure.
 */
function get_lastcommentmodified( $timezone = 'server' ) {
    global $wpdb;

    $timezone = strtolower( $timezone );
    $key = "lastcommentmodified:$timezone";

    $comment_modified_date = wp_cache_get( $key, 'timeinfo' );
    if ( false !== $comment_modified_date ) {
        return $comment_modified_date;
    }

    switch ( $timezone ) {
        case 'gmt':
            $comment_modified_date = $wpdb->get_var( "SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1" );
            break;
        case 'blog':
            $comment_modified_date = $wpdb->get_var( "SELECT comment_date FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1" );
            break;
        case 'server':
            $add_seconds_server = date( 'Z' );

            $comment_modified_date = $wpdb->get_var( $wpdb->prepare( "SELECT DATE_ADD(comment_date_gmt, INTERVAL %s SECOND) FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1", $add_seconds_server ) );
            break;
    }

    if ( $comment_modified_date ) {
        wp_cache_set( $key, $comment_modified_date, 'timeinfo' );

        return $comment_modified_date;
    }

    return false;
}

/**
 * The amount of comments in a post or total comments.
 *
 * A lot like wp_count_comments(), in that they both return comment stats (albeit with different types).
 * The wp_count_comments() actually caches, but this function does not.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $post_id Optional. Comment amount in post if > 0, else total comments blog wide.
 * @return array The amount of spam, approved, awaiting moderation, and total comments.
 */
function get_comment_count( $post_id = 0 ) {
    global $wpdb;

    $post_id = (int) $post_id;

    $where = '';
    if ( $post_id > 0 ) {
        $where = $wpdb->prepare("WHERE comment_post_ID = %d", $post_id);
    }

    $totals = (array) $wpdb->get_results("
        SELECT comment_approved, COUNT( * ) AS total
        FROM {$wpdb->comments}
        {$where}
        GROUP BY comment_approved
    ", ARRAY_A);

    $comment_count = array(
        'approved'            => 0,
        'awaiting_moderation' => 0,
        'spam'                => 0,
        'trash'               => 0,
        'post-trashed'        => 0,
        'total_comments'      => 0,
        'all'                 => 0,
    );

    foreach ( $totals as $row ) {
        switch ( $row['comment_approved'] ) {
            case 'trash':
                $comment_count['trash'] = $row['total'];
                break;
            case 'post-trashed':
                $comment_count['post-trashed'] = $row['total'];
                break;
            case 'spam':
                $comment_count['spam'] = $row['total'];
                $comment_count['total_comments'] += $row['total'];
                break;
            case '1':
                $comment_count['approved'] = $row['total'];
                $comment_count['total_comments'] += $row['total'];
                $comment_count['all'] += $row['total'];
                break;
            case '0':
                $comment_count['awaiting_moderation'] = $row['total'];
                $comment_count['total_comments'] += $row['total'];
                $comment_count['all'] += $row['total'];
                break;
            default:
                break;
        }
    }

    return $comment_count;
}

//
// Comment meta functions
//

/**
 * Add meta data field to a comment.
 *
 * @since 2.9.0
 * @link https://codex.wordpress.org/Function_Reference/add_comment_meta
 *
 * @param int $comment_id Comment ID.
 * @param string $meta_key Metadata name.
 * @param mixed $meta_value Metadata value.
 * @param bool $unique Optional, default is false. Whether the same key should not be added.
 * @return int|bool Meta ID on success, false on failure.
 */
function add_comment_meta($comment_id, $meta_key, $meta_value, $unique = false) {
    $added = add_metadata( 'comment', $comment_id, $meta_key, $meta_value, $unique );
    if ( $added ) {
        wp_cache_set( 'last_changed', microtime(), 'comment' );
    }
    return $added;
}

/**
 * Remove metadata matching criteria from a comment.
 *
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching key, if needed.
 *
 * @since 2.9.0
 * @link https://codex.wordpress.org/Function_Reference/delete_comment_meta
 *
 * @param int $comment_id comment ID
 * @param string $meta_key Metadata name.
 * @param mixed $meta_value Optional. Metadata value.
 * @return bool True on success, false on failure.
 */
function delete_comment_meta($comment_id, $meta_key, $meta_value = '') {
    $deleted = delete_metadata( 'comment', $comment_id, $meta_key, $meta_value );
    if ( $deleted ) {
        wp_cache_set( 'last_changed', microtime(), 'comment' );
    }
    return $deleted;
}

/**
 * Retrieve comment meta field for a comment.
 *
 * @since 2.9.0
 * @link https://codex.wordpress.org/Function_Reference/get_comment_meta
 *
 * @param int $comment_id Comment ID.
 * @param string $key Optional. The meta key to retrieve. By default, returns data for all keys.
 * @param bool $single Whether to return a single value.
 * @return mixed Will be an array if $single is false. Will be value of meta data field if $single
 *  is true.
 */
function get_comment_meta($comment_id, $key = '', $single = false) {
    return get_metadata('comment', $comment_id, $key, $single);
}

/**
 * Update comment meta field based on comment ID.
 *
 * Use the $prev_value parameter to differentiate between meta fields with the
 * same key and comment ID.
 *
 * If the meta field for the comment does not exist, it will be added.
 *
 * @since 2.9.0
 * @link https://codex.wordpress.org/Function_Reference/update_comment_meta
 *
 * @param int $comment_id Comment ID.
 * @param string $meta_key Metadata key.
 * @param mixed $meta_value Metadata value.
 * @param mixed $prev_value Optional. Previous value to check before removing.
 * @return int|bool Meta ID if the key didn't exist, true on successful update, false on failure.
 */
function update_comment_meta($comment_id, $meta_key, $meta_value, $prev_value = '') {
    $updated = update_metadata( 'comment', $comment_id, $meta_key, $meta_value, $prev_value );
    if ( $updated ) {
        wp_cache_set( 'last_changed', microtime(), 'comment' );
    }
    return $updated;
}

/**
 * Queues comments for metadata lazy-loading.
 *
 * @since 4.5.0
 *
 * @param array $comments Array of comment objects.
 */
function wp_queue_comments_for_comment_meta_lazyload( $comments ) {
    // Don't use `wp_list_pluck()` to avoid by-reference manipulation.
    $comment_ids = array();
    if ( is_array( $comments ) ) {
        foreach ( $comments as $comment ) {
            if ( $comment instanceof WP_Comment ) {
                $comment_ids[] = $comment->comment_ID;
            }
        }
    }

    if ( $comment_ids ) {
        $lazyloader = wp_metadata_lazyloader();
        $lazyloader->queue_objects( 'comment', $comment_ids );
    }
}

/**
 * Sets the cookies used to store an unauthenticated commentator's identity. Typically used
 * to recall previous comments by this commentator that are still held in moderation.
 *
 * @param WP_Comment $comment Comment object.
 * @param object     $user    Comment author's object.
 *
 * @since 3.4.0
 */
function wp_set_comment_cookies($comment, $user) {
    if ( $user->exists() )
        return;

    /**
     * Filters the lifetime of the comment cookie in seconds.
     *
     * @since 2.8.0
     *
     * @param int $seconds Comment cookie lifetime. Default 30000000.
     */
    $comment_cookie_lifetime = apply_filters( 'comment_cookie_lifetime', 30000000 );
    $secure = ( 'https' === parse_url( home_url(), PHP_URL_SCHEME ) );
    setcookie( 'comment_author_' . COOKIEHASH, $comment->comment_author, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
    setcookie( 'comment_author_email_' . COOKIEHASH, $comment->comment_author_email, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
    setcookie( 'comment_author_url_' . COOKIEHASH, esc_url($comment->comment_author_url), time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
}

/**
 * Sanitizes the cookies sent to the user already.
 *
 * Will only do anything if the cookies have already been created for the user.
 * Mostly used after cookies had been sent to use elsewhere.
 *
 * @since 2.0.4
 */
function sanitize_comment_cookies() {
    if ( isset( $_COOKIE['comment_author_' . COOKIEHASH] ) ) {
        /**
         * Filters the comment author's name cookie before it is set.
         *
         * When this filter hook is evaluated in wp_filter_comment(),
         * the comment author's name string is passed.
         *
         * @since 1.5.0
         *
         * @param string $author_cookie The comment author name cookie.
         */
        $comment_author = apply_filters( 'pre_comment_author_name', $_COOKIE['comment_author_' . COOKIEHASH] );
        $comment_author = wp_unslash($comment_author);
        $comment_author = esc_attr($comment_author);
        $_COOKIE['comment_author_' . COOKIEHASH] = $comment_author;
    }

    if ( isset( $_COOKIE['comment_author_email_' . COOKIEHASH] ) ) {
        /**
         * Filters the comment author's email cookie before it is set.
         *
         * When this filter hook is evaluated in wp_filter_comment(),
         * the comment author's email string is passed.
         *
         * @since 1.5.0
         *
         * @param string $author_email_cookie The comment author email cookie.
         */
        $comment_author_email = apply_filters( 'pre_comment_author_email', $_COOKIE['comment_author_email_' . COOKIEHASH] );
        $comment_author_email = wp_unslash($comment_author_email);
        $comment_author_email = esc_attr($comment_author_email);
        $_COOKIE['comment_author_email_'.COOKIEHASH] = $comment_author_email;
    }

    if ( isset( $_COOKIE['comment_author_url_' . COOKIEHASH] ) ) {
        /**
         * Filters the comment author's URL cookie before it is set.
         *
         * When this filter hook is evaluated in wp_filter_comment(),
         * the comment author's URL string is passed.
         *
         * @since 1.5.0
         *
         * @param string $author_url_cookie The comment author URL cookie.
         */
        $comment_author_url = apply_filters( 'pre_comment_author_url', $_COOKIE['comment_author_url_' . COOKIEHASH] );
        $comment_author_url = wp_unslash($comment_author_url);
        $_COOKIE['comment_author_url_'.COOKIEHASH] = $comment_author_url;
    }
}

/**
 * Validates whether this comment is allowed to be made.
 *
 * @since 2.0.0
 * @since 4.7.0 The `$avoid_die` parameter was added, allowing the function to
 *              return a WP_Error object instead of dying.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $commentdata Contains information on the comment.
 * @param bool  $avoid_die   When true, a disallowed comment will result in the function
 *                           returning a WP_Error object, rather than executing wp_die().
 *                           Default false.
 * @return int|string|WP_Error Allowed comments return the approval status (0|1|'spam').
 *                             If `$avoid_die` is true, disallowed comments return a WP_Error.
 */
function wp_allow_comment( $commentdata, $avoid_die = false ) {
    global $wpdb;

    // Simple duplicate check
    // expected_slashed ($comment_post_ID, $comment_author, $comment_author_email, $comment_content)
    $dupe = $wpdb->prepare(
        "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_parent = %s AND comment_approved != 'trash' AND ( comment_author = %s ",
        wp_unslash( $commentdata['comment_post_ID'] ),
        wp_unslash( $commentdata['comment_parent'] ),
        wp_unslash( $commentdata['comment_author'] )
    );
    if ( $commentdata['comment_author_email'] ) {
        $dupe .= $wpdb->prepare(
            "AND comment_author_email = %s ",
            wp_unslash( $commentdata['comment_author_email'] )
        );
    }
    $dupe .= $wpdb->prepare(
        ") AND comment_content = %s LIMIT 1",
        wp_unslash( $commentdata['comment_content'] )
    );

    $dupe_id = $wpdb->get_var( $dupe );

    /**
     * Filters the ID, if any, of the duplicate comment found when creating a new comment.
     *
     * Return an empty value from this filter to allow what WP considers a duplicate comment.
     *
     * @since 4.4.0
     *
     * @param int   $dupe_id     ID of the comment identified as a duplicate.
     * @param array $commentdata Data for the comment being created.
     */
    $dupe_id = apply_filters( 'duplicate_comment_id', $dupe_id, $commentdata );

    if ( $dupe_id ) {
        /**
         * Fires immediately after a duplicate comment is detected.
         *
         * @since 3.0.0
         *
         * @param array $commentdata Comment data.
         */
        do_action( 'comment_duplicate_trigger', $commentdata );
        if ( true === $avoid_die ) {
            return new WP_Error( 'comment_duplicate', __( 'Duplicate comment detected; it looks as though you’ve already said that!' ), 409 );
        } else {
            if ( wp_doing_ajax() ) {
                die( __('Duplicate comment detected; it looks as though you’ve already said that!') );
            }

            wp_die( __( 'Duplicate comment detected; it looks as though you’ve already said that!' ), 409 );
        }
    }

    /**
     * Fires immediately before a comment is marked approved.
     *
     * Allows checking for comment flooding.
     *
     * @since 2.3.0
     * @since 4.7.0 The `$avoid_die` parameter was added.
     *
     * @param string $comment_author_IP    Comment author's IP address.
     * @param string $comment_author_email Comment author's email.
     * @param string $comment_date_gmt     GMT date the comment was posted.
     * @param bool   $avoid_die            Whether to prevent executing wp_die()
     *                                     or die() if a comment flood is occurring.
     */
    do_action(
        'check_comment_flood',
        $commentdata['comment_author_IP'],
        $commentdata['comment_author_email'],
        $commentdata['comment_date_gmt'],
        $avoid_die
    );

    /**
     * Filters whether a comment is part of a comment flood.
     *
     * The default check is wp_check_comment_flood(). See check_comment_flood_db().
     *
     * @since 4.7.0
     *
     * @param bool   $is_flood             Is a comment flooding occurring? Default false.
     * @param string $comment_author_IP    Comment author's IP address.
     * @param string $comment_author_email Comment author's email.
     * @param string $comment_date_gmt     GMT date the comment was posted.
     * @param bool   $avoid_die            Whether to prevent executing wp_die()
     *                                     or die() if a comment flood is occurring.
     */
    $is_flood = apply_filters(
        'wp_is_comment_flood',
        false,
        $commentdata['comment_author_IP'],
        $commentdata['comment_author_email'],
        $commentdata['comment_date_gmt'],
        $avoid_die
    );

    if ( $is_flood ) {
        return new WP_Error( 'comment_flood', __( 'You are posting comments too quickly. Slow down.' ), 429 );
    }

    if ( ! empty( $commentdata['user_id'] ) ) {
        $user = get_userdata( $commentdata['user_id'] );
        $post_author = $wpdb->get_var( $wpdb->prepare(
            "SELECT post_author FROM $wpdb->posts WHERE ID = %d LIMIT 1",
            $commentdata['comment_post_ID']
        ) );
    }

    if ( isset( $user ) && ( $commentdata['user_id'] == $post_author || $user->has_cap( 'moderate_comments' ) ) ) {
        // The author and the admins get respect.
        $approved = 1;
    } else {
        // Everyone else's comments will be checked.
        if ( check_comment(
            $commentdata['comment_author'],
            $commentdata['comment_author_email'],
            $commentdata['comment_author_url'],
            $commentdata['comment_content'],
            $commentdata['comment_author_IP'],
            $commentdata['comment_agent'],
            $commentdata['comment_type']
        ) ) {
            $approved = 1;
        } else {
            $approved = 0;
        }

        if ( wp_blacklist_check(
            $commentdata['comment_author'],
            $commentdata['comment_author_email'],
            $commentdata['comment_author_url'],
            $commentdata['comment_content'],
            $commentdata['comment_author_IP'],
            $commentdata['comment_agent']
        ) ) {
            $approved = EMPTY_TRASH_DAYS ? 'trash' : 'spam';
        }
    }

    /**
     * Filters a comment's approval status before it is set.
     *
     * @since 2.1.0
     * @since 4.9.0 Returning a WP_Error value from the filter will shortcircuit comment insertion and
     *              allow skipping further processing.
     *
     * @param bool|string|WP_Error $approved    The approval status. Accepts 1, 0, 'spam' or WP_Error.
     * @param array                $commentdata Comment data.
     */
    $approved = apply_filters( 'pre_comment_approved', $approved, $commentdata );
    return $approved;
}

/**
 * Hooks WP's native database-based comment-flood check.
 *
 * This wrapper maintains backward compatibility with plugins that expect to
 * be able to unhook the legacy check_comment_flood_db() function from
 * 'check_comment_flood' using remove_action().
 *
 * @since 2.3.0
 * @since 4.7.0 Converted to be an add_filter() wrapper.
 */
function check_comment_flood_db() {
    add_filter( 'wp_is_comment_flood', 'wp_check_comment_flood', 10, 5 );
}

/**
 * Checks whether comment flooding is occurring.
 *
 * Won't run, if current user can manage options, so to not block
 * administrators.
 *
 * @since 4.7.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param bool   $is_flood  Is a comment flooding occurring?
 * @param string $ip        Comment author's IP address.
 * @param string $email     Comment author's email address.
 * @param string $date      MySQL time string.
 * @param bool   $avoid_die When true, a disallowed comment will result in the function
 *                          returning a WP_Error object, rather than executing wp_die().
 *                          Default false.
 * @return bool Whether comment flooding is occurring.
 */
function wp_check_comment_flood( $is_flood, $ip, $email, $date, $avoid_die = false ) {

    global $wpdb;

    // Another callback has declared a flood. Trust it.
    if ( true === $is_flood ) {
        return $is_flood;
    }

    // don't throttle admins or moderators
    if ( current_user_can( 'manage_options' ) || current_user_can( 'moderate_comments' ) ) {
        return false;
    }
    $hour_ago = gmdate( 'Y-m-d H:i:s', time() - HOUR_IN_SECONDS );

    if ( is_user_logged_in() ) {
        $user = get_current_user_id();
        $check_column = '`user_id`';
    } else {
        $user = $ip;
        $check_column = '`comment_author_IP`';
    }

    $sql = $wpdb->prepare(
        "SELECT `comment_date_gmt` FROM `$wpdb->comments` WHERE `comment_date_gmt` >= %s AND ( $check_column = %s OR `comment_author_email` = %s ) ORDER BY `comment_date_gmt` DESC LIMIT 1",
        $hour_ago,
        $user,
        $email
    );
    $lasttime = $wpdb->get_var( $sql );
    if ( $lasttime ) {
        $time_lastcomment = mysql2date('U', $lasttime, false);
        $time_newcomment  = mysql2date('U', $date, false);
        /**
         * Filters the comment flood status.
         *
         * @since 2.1.0
         *
         * @param bool $bool             Whether a comment flood is occurring. Default false.
         * @param int  $time_lastcomment Timestamp of when the last comment was posted.
         * @param int  $time_newcomment  Timestamp of when the new comment was posted.
         */
        $flood_die = apply_filters( 'comment_flood_filter', false, $time_lastcomment, $time_newcomment );
        if ( $flood_die ) {
            /**
             * Fires before the comment flood message is triggered.
             *
             * @since 1.5.0
             *
             * @param int $time_lastcomment Timestamp of when the last comment was posted.
             * @param int $time_newcomment  Timestamp of when the new comment was posted.
             */
            do_action( 'comment_flood_trigger', $time_lastcomment, $time_newcomment );
            if ( true === $avoid_die ) {
                return true;
            } else {
                if ( wp_doing_ajax() ) {
                    die( __('You are posting comments too quickly. Slow down.') );
                }

                wp_die( __( 'You are posting comments too quickly. Slow down.' ), 429 );
            }
        }
    }

    return false;
}

/**
 * Separates an array of comments into an array keyed by comment_type.
 *
 * @since 2.7.0
 *
 * @param array $comments Array of comments
 * @return array Array of comments keyed by comment_type.
 */
function separate_comments(&$comments) {
    $comments_by_type = array('comment' => array(), 'trackback' => array(), 'pingback' => array(), 'pings' => array());
    $count = count($comments);
    for ( $i = 0; $i < $count; $i++ ) {
        $type = $comments[$i]->comment_type;
        if ( empty($type) )
            $type = 'comment';
        $comments_by_type[$type][] = &$comments[$i];
        if ( 'trackback' == $type || 'pingback' == $type )
            $comments_by_type['pings'][] = &$comments[$i];
    }

    return $comments_by_type;
}

/**
 * Calculate the total number of comment pages.
 *
 * @since 2.7.0
 *
 * @uses Walker_Comment
 *
 * @global WP_Query $wp_query
 *
 * @param array $comments Optional array of WP_Comment objects. Defaults to $wp_query->comments
 * @param int   $per_page Optional comments per page.
 * @param bool  $threaded Optional control over flat or threaded comments.
 * @return int Number of comment pages.
 */
function get_comment_pages_count( $comments = null, $per_page = null, $threaded = null ) {
    global $wp_query;

    if ( null === $comments && null === $per_page && null === $threaded && !empty($wp_query->max_num_comment_pages) )
        return $wp_query->max_num_comment_pages;

    if ( ( ! $comments || ! is_array( $comments ) ) && ! empty( $wp_query->comments )  )
        $comments = $wp_query->comments;

    if ( empty($comments) )
        return 0;

    if ( ! get_option( 'page_comments' ) ) {
        return 1;
    }

    if ( !isset($per_page) )
        $per_page = (int) get_query_var('comments_per_page');
    if ( 0 === $per_page )
        $per_page = (int) get_option('comments_per_page');
    if ( 0 === $per_page )
        return 1;

    if ( !isset($threaded) )
        $threaded = get_option('thread_comments');

    if ( $threaded ) {
        $walker = new Walker_Comment;
        $count = ceil( $walker->get_number_of_root_elements( $comments ) / $per_page );
    } else {
        $count = ceil( count( $comments ) / $per_page );
    }

    return $count;
}

/**
 * Calculate what page number a comment will appear on for comment paging.
 *
 * @since 2.7.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int   $comment_ID Comment ID.
 * @param array $args {
 *      Array of optional arguments.
 *      @type string     $type      Limit paginated comments to those matching a given type. Accepts 'comment',
 *                                  'trackback', 'pingback', 'pings' (trackbacks and pingbacks), or 'all'.
 *                                  Default is 'all'.
 *      @type int        $per_page  Per-page count to use when calculating pagination. Defaults to the value of the
 *                                  'comments_per_page' option.
 *      @type int|string $max_depth If greater than 1, comment page will be determined for the top-level parent of
 *                                  `$comment_ID`. Defaults to the value of the 'thread_comments_depth' option.
 * } *
 * @return int|null Comment page number or null on error.
 */
function get_page_of_comment( $comment_ID, $args = array() ) {
    global $wpdb;

    $page = null;

    if ( !$comment = get_comment( $comment_ID ) )
        return;

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

    // Order of precedence: 1. `$args['per_page']`, 2. 'comments_per_page' query_var, 3. 'comments_per_page' option.
    if ( get_option( 'page_comments' ) ) {
        if ( '' === $args['per_page'] ) {
            $args['per_page'] = get_query_var( 'comments_per_page' );
        }

        if ( '' === $args['per_page'] ) {
            $args['per_page'] = get_option( 'comments_per_page' );
        }
    }

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

    if ( $args['per_page'] < 1 ) {
        $page = 1;
    }

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

        // Find this comment's top level parent if threading is enabled
        if ( $args['max_depth'] > 1 && 0 != $comment->comment_parent )
            return get_page_of_comment( $comment->comment_parent, $args );

        $comment_args = array(
            'type'       => $args['type'],
            'post_id'    => $comment->comment_post_ID,
            'fields'     => 'ids',
            'count'      => true,
            'status'     => 'approve',
            'parent'     => 0,
            'date_query' => array(
                array(
                    'column' => "$wpdb->comments.comment_date_gmt",
                    'before' => $comment->comment_date_gmt,
                )
            ),
        );

        $comment_query = new WP_Comment_Query();
        $older_comment_count = $comment_query->query( $comment_args );

        // No older comments? Then it's page #1.
        if ( 0 == $older_comment_count ) {
            $page = 1;

        // Divide comments older than this one by comments per page to get this comment's page number
        } else {
            $page = ceil( ( $older_comment_count + 1 ) / $args['per_page'] );
        }
    }

    /**
     * Filters the calculated page on which a comment appears.
     *
     * @since 4.4.0
     * @since 4.7.0 Introduced the `$comment_ID` parameter.
     *
     * @param int   $page          Comment page.
     * @param array $args {
     *     Arguments used to calculate pagination. These include arguments auto-detected by the function,
     *     based on query vars, system settings, etc. For pristine arguments passed to the function,
     *     see `$original_args`.
     *
     *     @type string $type      Type of comments to count.
     *     @type int    $page      Calculated current page.
     *     @type int    $per_page  Calculated number of comments per page.
     *     @type int    $max_depth Maximum comment threading depth allowed.
     * }
     * @param array $original_args {
     *     Array of arguments passed to the function. Some or all of these may not be set.
     *
     *     @type string $type      Type of comments to count.
     *     @type int    $page      Current comment page.
     *     @type int    $per_page  Number of comments per page.
     *     @type int    $max_depth Maximum comment threading depth allowed.
     * }
     * @param int $comment_ID ID of the comment.
     */
    return apply_filters( 'get_page_of_comment', (int) $page, $args, $original_args, $comment_ID );
}

/**
 * Retrieves the maximum character lengths for the comment form fields.
 *
 * @since 4.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return array Maximum character length for the comment form fields.
 */
function wp_get_comment_fields_max_lengths() {
    global $wpdb;

    $lengths = array(
        'comment_author'       => 245,
        'comment_author_email' => 100,
        'comment_author_url'   => 200,
        'comment_content'      => 65525,
    );

    if ( $wpdb->is_mysql ) {
        foreach ( $lengths as $column => $length ) {
            $col_length = $wpdb->get_col_length( $wpdb->comments, $column );
            $max_length = 0;

            // No point if we can't get the DB column lengths
            if ( is_wp_error( $col_length ) ) {
                break;
            }

            if ( ! is_array( $col_length ) && (int) $col_length > 0 ) {
                $max_length = (int) $col_length;
            } elseif ( is_array( $col_length ) && isset( $col_length['length'] ) && intval( $col_length['length'] ) > 0 ) {
                $max_length = (int) $col_length['length'];

                if ( ! empty( $col_length['type'] ) && 'byte' === $col_length['type'] ) {
                    $max_length = $max_length - 10;
                }
            }

            if ( $max_length > 0 ) {
                $lengths[ $column ] = $max_length;
            }
        }
    }

    /**
     * Filters the lengths for the comment form fields.
     *
     * @since 4.5.0
     *
     * @param array $lengths Associative array `'field_name' => 'maximum length'`.
     */
    return apply_filters( 'wp_get_comment_fields_max_lengths', $lengths );
}

/**
 * Compares the lengths of comment data against the maximum character limits.
 *
 * @since 4.7.0
 *
 * @param array $comment_data Array of arguments for inserting a comment.
 * @return WP_Error|true WP_Error when a comment field exceeds the limit,
 *                       otherwise true.
 */
function wp_check_comment_data_max_lengths( $comment_data ) {
    $max_lengths = wp_get_comment_fields_max_lengths();

    if ( isset( $comment_data['comment_author'] ) && mb_strlen( $comment_data['comment_author'], '8bit' ) > $max_lengths['comment_author'] ) {
        return new WP_Error( 'comment_author_column_length', __( '<strong>ERROR</strong>: your name is too long.' ), 200 );
    }

    if ( isset( $comment_data['comment_author_email'] ) && strlen( $comment_data['comment_author_email'] ) > $max_lengths['comment_author_email'] ) {
        return new WP_Error( 'comment_author_email_column_length', __( '<strong>ERROR</strong>: your email address is too long.' ), 200 );
    }

    if ( isset( $comment_data['comment_author_url'] ) && strlen( $comment_data['comment_author_url'] ) > $max_lengths['comment_author_url'] ) {
        return new WP_Error( 'comment_author_url_column_length', __( '<strong>ERROR</strong>: your url is too long.' ), 200 );
    }

    if ( isset( $comment_data['comment_content'] ) && mb_strlen( $comment_data['comment_content'], '8bit' ) > $max_lengths['comment_content'] ) {
        return new WP_Error( 'comment_content_column_length', __( '<strong>ERROR</strong>: your comment is too long.' ), 200 );
    }

    return true;
}

/**
 * Does comment contain blacklisted characters or words.
 *
 * @since 1.5.0
 *
 * @param string $author The author of the comment
 * @param string $email The email of the comment
 * @param string $url The url used in the comment
 * @param string $comment The comment content
 * @param string $user_ip The comment author's IP address
 * @param string $user_agent The author's browser user agent
 * @return bool True if comment contains blacklisted content, false if comment does not
 */
function wp_blacklist_check($author, $email, $url, $comment, $user_ip, $user_agent) {
    /**
     * Fires before the comment is tested for blacklisted characters or words.
     *
     * @since 1.5.0
     *
     * @param string $author     Comment author.
     * @param string $email      Comment author's email.
     * @param string $url        Comment author's URL.
     * @param string $comment    Comment content.
     * @param string $user_ip    Comment author's IP address.
     * @param string $user_agent Comment author's browser user agent.
     */
    do_action( 'wp_blacklist_check', $author, $email, $url, $comment, $user_ip, $user_agent );

    $mod_keys = trim( get_option('blacklist_keys') );
    if ( '' == $mod_keys )
        return false; // If moderation keys are empty

    // Ensure HTML tags are not being used to bypass the blacklist.
    $comment_without_html = wp_strip_all_tags( $comment );

    $words = explode("\n", $mod_keys );

    foreach ( (array) $words as $word ) {
        $word = trim($word);

        // Skip empty lines
        if ( empty($word) ) { continue; }

        // Do some escaping magic so that '#' chars in the
        // spam words don't break things:
        $word = preg_quote($word, '#');

        $pattern = "#$word#i";
        if (
               preg_match($pattern, $author)
            || preg_match($pattern, $email)
            || preg_match($pattern, $url)
            || preg_match($pattern, $comment)
            || preg_match($pattern, $comment_without_html)
            || preg_match($pattern, $user_ip)
            || preg_match($pattern, $user_agent)
         )
            return true;
    }
    return false;
}

/**
 * Retrieve total comments for blog or single post.
 *
 * The properties of the returned object contain the 'moderated', 'approved',
 * and spam comments for either the entire blog or single post. Those properties
 * contain the amount of comments that match the status. The 'total_comments'
 * property contains the integer of total comments.
 *
 * The comment stats are cached and then retrieved, if they already exist in the
 * cache.
 *
 * @since 2.5.0
 *
 * @param int $post_id Optional. Post ID.
 * @return object|array Comment stats.
 */
function wp_count_comments( $post_id = 0 ) {
    $post_id = (int) $post_id;

    /**
     * Filters the comments count for a given post.
     *
     * @since 2.7.0
     *
     * @param array $count   An empty array.
     * @param int   $post_id The post ID.
     */
    $filtered = apply_filters( 'wp_count_comments', array(), $post_id );
    if ( ! empty( $filtered ) ) {
        return $filtered;
    }

    $count = wp_cache_get( "comments-{$post_id}", 'counts' );
    if ( false !== $count ) {
        return $count;
    }

    $stats = get_comment_count( $post_id );
    $stats['moderated'] = $stats['awaiting_moderation'];
    unset( $stats['awaiting_moderation'] );

    $stats_object = (object) $stats;
    wp_cache_set( "comments-{$post_id}", $stats_object, 'counts' );

    return $stats_object;
}

/**
 * Trashes or deletes a comment.
 *
 * The comment is moved to trash instead of permanently deleted unless trash is
 * disabled, item is already in the trash, or $force_delete is true.
 *
 * The post comment count will be updated if the comment was approved and has a
 * post ID available.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Comment $comment_id   Comment ID or WP_Comment object.
 * @param bool           $force_delete Whether to bypass trash and force deletion. Default is false.
 * @return bool True on success, false on failure.
 */
function wp_delete_comment($comment_id, $force_delete = false) {
    global $wpdb;
    if (!$comment = get_comment($comment_id))
        return false;

    if ( !$force_delete && EMPTY_TRASH_DAYS && !in_array( wp_get_comment_status( $comment ), array( 'trash', 'spam' ) ) )
        return wp_trash_comment($comment_id);

    /**
     * Fires immediately before a comment is deleted from the database.
     *
     * @since 1.2.0
     * @since 4.9.0 Added the `$comment` parameter.
     *
     * @param int        $comment_id The comment ID.
     * @param WP_Comment $comment    The comment to be deleted.
     */
    do_action( 'delete_comment', $comment->comment_ID, $comment );

    // Move children up a level.
    $children = $wpdb->get_col( $wpdb->prepare("SELECT comment_ID FROM $wpdb->comments WHERE comment_parent = %d", $comment->comment_ID) );
    if ( !empty($children) ) {
        $wpdb->update($wpdb->comments, array('comment_parent' => $comment->comment_parent), array('comment_parent' => $comment->comment_ID));
        clean_comment_cache($children);
    }

    // Delete metadata
    $meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->commentmeta WHERE comment_id = %d", $comment->comment_ID ) );
    foreach ( $meta_ids as $mid )
        delete_metadata_by_mid( 'comment', $mid );

    if ( ! $wpdb->delete( $wpdb->comments, array( 'comment_ID' => $comment->comment_ID ) ) )
        return false;

    /**
     * Fires immediately after a comment is deleted from the database.
     *
     * @since 2.9.0
     * @since 4.9.0 Added the `$comment` parameter.
     *
     * @param int        $comment_id The comment ID.
     * @param WP_Comment $comment    The deleted comment.
     */
    do_action( 'deleted_comment', $comment->comment_ID, $comment );

    $post_id = $comment->comment_post_ID;
    if ( $post_id && $comment->comment_approved == 1 )
        wp_update_comment_count($post_id);

    clean_comment_cache( $comment->comment_ID );

    /** This action is documented in wp-includes/comment.php */
    do_action( 'wp_set_comment_status', $comment->comment_ID, 'delete' );

    wp_transition_comment_status('delete', $comment->comment_approved, $comment);
    return true;
}

/**
 * Moves a comment to the Trash
 *
 * If trash is disabled, comment is permanently deleted.
 *
 * @since 2.9.0
 *
 * @param int|WP_Comment $comment_id Comment ID or WP_Comment object.
 * @return bool True on success, false on failure.
 */
function wp_trash_comment($comment_id) {
    if ( !EMPTY_TRASH_DAYS )
        return wp_delete_comment($comment_id, true);

    if ( !$comment = get_comment($comment_id) )
        return false;

    /**
     * Fires immediately before a comment is sent to the Trash.
     *
     * @since 2.9.0
     * @since 4.9.0 Added the `$comment` parameter.
     *
     * @param int        $comment_id The comment ID.
     * @param WP_Comment $comment    The comment to be trashed.
     */
    do_action( 'trash_comment', $comment->comment_ID, $comment );

    if ( wp_set_comment_status( $comment, 'trash' ) ) {
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_status' );
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_time' );
        add_comment_meta( $comment->comment_ID, '_wp_trash_meta_status', $comment->comment_approved );
        add_comment_meta( $comment->comment_ID, '_wp_trash_meta_time', time() );

        /**
         * Fires immediately after a comment is sent to Trash.
         *
         * @since 2.9.0
         * @since 4.9.0 Added the `$comment` parameter.
         *
         * @param int        $comment_id The comment ID.
         * @param WP_Comment $comment    The trashed comment.
         */
        do_action( 'trashed_comment', $comment->comment_ID, $comment );
        return true;
    }

    return false;
}

/**
 * Removes a comment from the Trash
 *
 * @since 2.9.0
 *
 * @param int|WP_Comment $comment_id Comment ID or WP_Comment object.
 * @return bool True on success, false on failure.
 */
function wp_untrash_comment($comment_id) {
    $comment = get_comment( $comment_id );
    if ( ! $comment ) {
        return false;
    }

    /**
     * Fires immediately before a comment is restored from the Trash.
     *
     * @since 2.9.0
     * @since 4.9.0 Added the `$comment` parameter.
     *
     * @param int        $comment_id The comment ID.
     * @param WP_Comment $comment    The comment to be untrashed.
     */
    do_action( 'untrash_comment', $comment->comment_ID, $comment );

    $status = (string) get_comment_meta( $comment->comment_ID, '_wp_trash_meta_status', true );
    if ( empty($status) )
        $status = '0';

    if ( wp_set_comment_status( $comment, $status ) ) {
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_time' );
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_status' );
        /**
         * Fires immediately after a comment is restored from the Trash.
         *
         * @since 2.9.0
         * @since 4.9.0 Added the `$comment` parameter.
         *
         * @param int        $comment_id The comment ID.
         * @param WP_Comment $comment    The untrashed comment.
         */
        do_action( 'untrashed_comment', $comment->comment_ID, $comment );
        return true;
    }

    return false;
}

/**
 * Marks a comment as Spam
 *
 * @since 2.9.0
 *
 * @param int|WP_Comment $comment_id Comment ID or WP_Comment object.
 * @return bool True on success, false on failure.
 */
function wp_spam_comment( $comment_id ) {
    $comment = get_comment( $comment_id );
    if ( ! $comment ) {
        return false;
    }

    /**
     * Fires immediately before a comment is marked as Spam.
     *
     * @since 2.9.0
     * @since 4.9.0 Added the `$comment` parameter.
     *
     * @param int        $comment_id The comment ID.
     * @param WP_Comment $comment    The comment to be marked as spam.
     */
    do_action( 'spam_comment', $comment->comment_ID, $comment );

    if ( wp_set_comment_status( $comment, 'spam' ) ) {
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_status' );
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_time' );
        add_comment_meta( $comment->comment_ID, '_wp_trash_meta_status', $comment->comment_approved );
        add_comment_meta( $comment->comment_ID, '_wp_trash_meta_time', time() );
        /**
         * Fires immediately after a comment is marked as Spam.
         *
         * @since 2.9.0
         * @since 4.9.0 Added the `$comment` parameter.
         *
         * @param int        $comment_id The comment ID.
         * @param WP_Comment $comment    The comment marked as spam.
         */
        do_action( 'spammed_comment', $comment->comment_ID, $comment );
        return true;
    }

    return false;
}

/**
 * Removes a comment from the Spam
 *
 * @since 2.9.0
 *
 * @param int|WP_Comment $comment_id Comment ID or WP_Comment object.
 * @return bool True on success, false on failure.
 */
function wp_unspam_comment( $comment_id ) {
    $comment = get_comment( $comment_id );
    if ( ! $comment ) {
        return false;
    }

    /**
     * Fires immediately before a comment is unmarked as Spam.
     *
     * @since 2.9.0
     * @since 4.9.0 Added the `$comment` parameter.
     *
     * @param int        $comment_id The comment ID.
     * @param WP_Comment $comment    The comment to be unmarked as spam.
     */
    do_action( 'unspam_comment', $comment->comment_ID, $comment );

    $status = (string) get_comment_meta( $comment->comment_ID, '_wp_trash_meta_status', true );
    if ( empty($status) )
        $status = '0';

    if ( wp_set_comment_status( $comment, $status ) ) {
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_status' );
        delete_comment_meta( $comment->comment_ID, '_wp_trash_meta_time' );
        /**
         * Fires immediately after a comment is unmarked as Spam.
         *
         * @since 2.9.0
         * @since 4.9.0 Added the `$comment` parameter.
         *
         * @param int        $comment_id The comment ID.
         * @param WP_Comment $comment    The comment unmarked as spam.
         */
        do_action( 'unspammed_comment', $comment->comment_ID, $comment );
        return true;
    }

    return false;
}

/**
 * The status of a comment by ID.
 *
 * @since 1.0.0
 *
 * @param int|WP_Comment $comment_id Comment ID or WP_Comment object
 * @return false|string Status might be 'trash', 'approved', 'unapproved', 'spam'. False on failure.
 */
function wp_get_comment_status($comment_id) {
    $comment = get_comment($comment_id);
    if ( !$comment )
        return false;

    $approved = $comment->comment_approved;

    if ( $approved == null )
        return false;
    elseif ( $approved == '1' )
        return 'approved';
    elseif ( $approved == '0' )
        return 'unapproved';
    elseif ( $approved == 'spam' )
        return 'spam';
    elseif ( $approved == 'trash' )
        return 'trash';
    else
        return false;
}

/**
 * Call hooks for when a comment status transition occurs.
 *
 * Calls hooks for comment status transitions. If the new comment status is not the same
 * as the previous comment status, then two hooks will be ran, the first is
 * {@see 'transition_comment_status'} with new status, old status, and comment data. The
 * next action called is {@see comment_$old_status_to_$new_status'}. It has the
 * comment data.
 *
 * The final action will run whether or not the comment statuses are the same. The
 * action is named {@see 'comment_$new_status_$comment->comment_type'}.
 *
 * @since 2.7.0
 *
 * @param string $new_status New comment status.
 * @param string $old_status Previous comment status.
 * @param object $comment Comment data.
 */
function wp_transition_comment_status($new_status, $old_status, $comment) {
    /*
     * Translate raw statuses to human readable formats for the hooks.
     * This is not a complete list of comment status, it's only the ones
     * that need to be renamed
     */
    $comment_statuses = array(
        0         => 'unapproved',
        'hold'    => 'unapproved', // wp_set_comment_status() uses "hold"
        1         => 'approved',
        'approve' => 'approved', // wp_set_comment_status() uses "approve"
    );
    if ( isset($comment_statuses[$new_status]) ) $new_status = $comment_statuses[$new_status];
    if ( isset($comment_statuses[$old_status]) ) $old_status = $comment_statuses[$old_status];

    // Call the hooks
    if ( $new_status != $old_status ) {
        /**
         * Fires when the comment status is in transition.
         *
         * @since 2.7.0
         *
         * @param int|string $new_status The new comment status.
         * @param int|string $old_status The old comment status.
         * @param object     $comment    The comment data.
         */
        do_action( 'transition_comment_status', $new_status, $old_status, $comment );
        /**
         * Fires when the comment status is in transition from one specific status to another.
         *
         * The dynamic portions of the hook name, `$old_status`, and `$new_status`,
         * refer to the old and new comment statuses, respectively.
         *
         * @since 2.7.0
         *
         * @param WP_Comment $comment Comment object.
         */
        do_action( "comment_{$old_status}_to_{$new_status}", $comment );
    }
    /**
     * Fires when the status of a specific comment type is in transition.
     *
     * The dynamic portions of the hook name, `$new_status`, and `$comment->comment_type`,
     * refer to the new comment status, and the type of comment, respectively.
     *
     * Typical comment types include an empty string (standard comment), 'pingback',
     * or 'trackback'.
     *
     * @since 2.7.0
     *
     * @param int        $comment_ID The comment ID.
     * @param WP_Comment $comment    Comment object.
     */
    do_action( "comment_{$new_status}_{$comment->comment_type}", $comment->comment_ID, $comment );
}

/**
 * Clear the lastcommentmodified cached value when a comment status is changed.
 *
 * Deletes the lastcommentmodified cache key when a comment enters or leaves
 * 'approved' status.
 *
 * @since 4.7.0
 * @access private
 *
 * @param string $new_status The new comment status.
 * @param string $old_status The old comment status.
 */
function _clear_modified_cache_on_transition_comment_status( $new_status, $old_status ) {
    if ( 'approved' === $new_status || 'approved' === $old_status ) {
        foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) {
            wp_cache_delete( "lastcommentmodified:$timezone", 'timeinfo' );
        }
    }
}

/**
 * Get current commenter's name, email, and URL.
 *
 * Expects cookies content to already be sanitized. User of this function might
 * wish to recheck the returned array for validity.
 *
 * @see sanitize_comment_cookies() Use to sanitize cookies
 *
 * @since 2.0.4
 *
 * @return array Comment author, email, url respectively.
 */
function wp_get_current_commenter() {
    // Cookies should already be sanitized.

    $comment_author = '';
    if ( isset($_COOKIE['comment_author_'.COOKIEHASH]) )
        $comment_author = $_COOKIE['comment_author_'.COOKIEHASH];

    $comment_author_email = '';
    if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) )
        $comment_author_email = $_COOKIE['comment_author_email_'.COOKIEHASH];

    $comment_author_url = '';
    if ( isset($_COOKIE['comment_author_url_'.COOKIEHASH]) )
        $comment_author_url = $_COOKIE['comment_author_url_'.COOKIEHASH];

    /**
     * Filters the current commenter's name, email, and URL.
     *
     * @since 3.1.0
     *
     * @param array $comment_author_data {
     *     An array of current commenter variables.
     *
     *     @type string $comment_author       The name of the author of the comment. Default empty.
     *     @type string $comment_author_email The email address of the `$comment_author`. Default empty.
     *     @type string $comment_author_url   The URL address of the `$comment_author`. Default empty.
     * }
     */
    return apply_filters( 'wp_get_current_commenter', compact('comment_author', 'comment_author_email', 'comment_author_url') );
}

/**
 * Inserts a comment into the database.
 *
 * @since 2.0.0
 * @since 4.4.0 Introduced `$comment_meta` argument.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $commentdata {
 *     Array of arguments for inserting a new comment.
 *
 *     @type string     $comment_agent        The HTTP user agent of the `$comment_author` when
 *                                            the comment was submitted. Default empty.
 *     @type int|string $comment_approved     Whether the comment has been approved. Default 1.
 *     @type string     $comment_author       The name of the author of the comment. Default empty.
 *     @type string     $comment_author_email The email address of the `$comment_author`. Default empty.
 *     @type string     $comment_author_IP    The IP address of the `$comment_author`. Default empty.
 *     @type string     $comment_author_url   The URL address of the `$comment_author`. Default empty.
 *     @type string     $comment_content      The content of the comment. Default empty.
 *     @type string     $comment_date         The date the comment was submitted. To set the date
 *                                            manually, `$comment_date_gmt` must also be specified.
 *                                            Default is the current time.
 *     @type string     $comment_date_gmt     The date the comment was submitted in the GMT timezone.
 *                                            Default is `$comment_date` in the site's GMT timezone.
 *     @type int        $comment_karma        The karma of the comment. Default 0.
 *     @type int        $comment_parent       ID of this comment's parent, if any. Default 0.
 *     @type int        $comment_post_ID      ID of the post that relates to the comment, if any.
 *                                            Default 0.
 *     @type string     $comment_type         Comment type. Default empty.
 *     @type array      $comment_meta         Optional. Array of key/value pairs to be stored in commentmeta for the
 *                                            new comment.
 *     @type int        $user_id              ID of the user who submitted the comment. Default 0.
 * }
 * @return int|false The new comment's ID on success, false on failure.
 */
function wp_insert_comment( $commentdata ) {
    global $wpdb;
    $data = wp_unslash( $commentdata );

    $comment_author       = ! isset( $data['comment_author'] )       ? '' : $data['comment_author'];
    $comment_author_email = ! isset( $data['comment_author_email'] ) ? '' : $data['comment_author_email'];
    $comment_author_url   = ! isset( $data['comment_author_url'] )   ? '' : $data['comment_author_url'];
    $comment_author_IP    = ! isset( $data['comment_author_IP'] )    ? '' : $data['comment_author_IP'];

    $comment_date     = ! isset( $data['comment_date'] )     ? current_time( 'mysql' )            : $data['comment_date'];
    $comment_date_gmt = ! isset( $data['comment_date_gmt'] ) ? get_gmt_from_date( $comment_date ) : $data['comment_date_gmt'];

    $comment_post_ID  = ! isset( $data['comment_post_ID'] )  ? 0  : $data['comment_post_ID'];
    $comment_content  = ! isset( $data['comment_content'] )  ? '' : $data['comment_content'];
    $comment_karma    = ! isset( $data['comment_karma'] )    ? 0  : $data['comment_karma'];
    $comment_approved = ! isset( $data['comment_approved'] ) ? 1  : $data['comment_approved'];
    $comment_agent    = ! isset( $data['comment_agent'] )    ? '' : $data['comment_agent'];
    $comment_type     = ! isset( $data['comment_type'] )     ? '' : $data['comment_type'];
    $comment_parent   = ! isset( $data['comment_parent'] )   ? 0  : $data['comment_parent'];

    $user_id  = ! isset( $data['user_id'] ) ? 0 : $data['user_id'];

    $compacted = compact( 'comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_date', 'comment_date_gmt', 'comment_content', 'comment_karma', 'comment_approved', 'comment_agent', 'comment_type', 'comment_parent', 'user_id' );
    if ( ! $wpdb->insert( $wpdb->comments, $compacted ) ) {
        return false;
    }

    $id = (int) $wpdb->insert_id;

    if ( $comment_approved == 1 ) {
        wp_update_comment_count( $comment_post_ID );

        foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) {
            wp_cache_delete( "lastcommentmodified:$timezone", 'timeinfo' );
        }
    }

    clean_comment_cache( $id );

    $comment = get_comment( $id );

    // If metadata is provided, store it.
    if ( isset( $commentdata['comment_meta'] ) && is_array( $commentdata['comment_meta'] ) ) {
        foreach ( $commentdata['comment_meta'] as $meta_key => $meta_value ) {
            add_comment_meta( $comment->comment_ID, $meta_key, $meta_value, true );
        }
    }

    /**
     * Fires immediately after a comment is inserted into the database.
     *
     * @since 2.8.0
     *
     * @param int        $id      The comment ID.
     * @param WP_Comment $comment Comment object.
     */
    do_action( 'wp_insert_comment', $id, $comment );

    return $id;
}

/**
 * Filters and sanitizes comment data.
 *
 * Sets the comment data 'filtered' field to true when finished. This can be
 * checked as to whether the comment should be filtered and to keep from
 * filtering the same comment more than once.
 *
 * @since 2.0.0
 *
 * @param array $commentdata Contains information on the comment.
 * @return array Parsed comment information.
 */
function wp_filter_comment($commentdata) {
    if ( isset( $commentdata['user_ID'] ) ) {
        /**
         * Filters the comment author's user id before it is set.
         *
         * The first time this filter is evaluated, 'user_ID' is checked
         * (for back-compat), followed by the standard 'user_id' value.
         *
         * @since 1.5.0
         *
         * @param int $user_ID The comment author's user ID.
         */
        $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_ID'] );
    } elseif ( isset( $commentdata['user_id'] ) ) {
        /** This filter is documented in wp-includes/comment.php */
        $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_id'] );
    }

    /**
     * Filters the comment author's browser user agent before it is set.
     *
     * @since 1.5.0
     *
     * @param string $comment_agent The comment author's browser user agent.
     */
    $commentdata['comment_agent'] = apply_filters( 'pre_comment_user_agent', ( isset( $commentdata['comment_agent'] ) ? $commentdata['comment_agent'] : '' ) );
    /** This filter is documented in wp-includes/comment.php */
    $commentdata['comment_author'] = apply_filters( 'pre_comment_author_name', $commentdata['comment_author'] );
    /**
     * Filters the comment content before it is set.
     *
     * @since 1.5.0
     *
     * @param string $comment_content The comment content.
     */
    $commentdata['comment_content'] = apply_filters( 'pre_comment_content', $commentdata['comment_content'] );
    /**
     * Filters the comment author's IP address before it is set.
     *
     * @since 1.5.0
     *
     * @param string $comment_author_ip The comment author's IP address.
     */
    $commentdata['comment_author_IP'] = apply_filters( 'pre_comment_user_ip', $commentdata['comment_author_IP'] );
    /** This filter is documented in wp-includes/comment.php */
    $commentdata['comment_author_url'] = apply_filters( 'pre_comment_author_url', $commentdata['comment_author_url'] );
    /** This filter is documented in wp-includes/comment.php */
    $commentdata['comment_author_email'] = apply_filters( 'pre_comment_author_email', $commentdata['comment_author_email'] );
    $commentdata['filtered'] = true;
    return $commentdata;
}

/**
 * Whether a comment should be blocked because of comment flood.
 *
 * @since 2.1.0
 *
 * @param bool $block Whether plugin has already blocked comment.
 * @param int $time_lastcomment Timestamp for last comment.
 * @param int $time_newcomment Timestamp for new comment.
 * @return bool Whether comment should be blocked.
 */
function wp_throttle_comment_flood($block, $time_lastcomment, $time_newcomment) {
    if ( $block ) // a plugin has already blocked... we'll let that decision stand
        return $block;
    if ( ($time_newcomment - $time_lastcomment) < 15 )
        return true;
    return false;
}

/**
 * Adds a new comment to the database.
 *
 * Filters new comment to ensure that the fields are sanitized and valid before
 * inserting comment into database. Calls {@see 'comment_post'} action with comment ID
 * and whether comment is approved by WordPress. Also has {@see 'preprocess_comment'}
 * filter for processing the comment data before the function handles it.
 *
 * We use `REMOTE_ADDR` here directly. If you are behind a proxy, you should ensure
 * that it is properly set, such as in wp-config.php, for your environment.
 *
 * See {@link https://core.trac.wordpress.org/ticket/9235}
 *
 * @since 1.5.0
 * @since 4.3.0 'comment_agent' and 'comment_author_IP' can be set via `$commentdata`.
 * @since 4.7.0 The `$avoid_die` parameter was added, allowing the function to
 *              return a WP_Error object instead of dying.
 *
 * @see wp_insert_comment()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $commentdata {
 *     Comment data.
 *
 *     @type string $comment_author       The name of the comment author.
 *     @type string $comment_author_email The comment author email address.
 *     @type string $comment_author_url   The comment author URL.
 *     @type string $comment_content      The content of the comment.
 *     @type string $comment_date         The date the comment was submitted. Default is the current time.
 *     @type string $comment_date_gmt     The date the comment was submitted in the GMT timezone.
 *                                        Default is `$comment_date` in the GMT timezone.
 *     @type int    $comment_parent       The ID of this comment's parent, if any. Default 0.
 *     @type int    $comment_post_ID      The ID of the post that relates to the comment.
 *     @type int    $user_id              The ID of the user who submitted the comment. Default 0.
 *     @type int    $user_ID              Kept for backward-compatibility. Use `$user_id` instead.
 *     @type string $comment_agent        Comment author user agent. Default is the value of 'HTTP_USER_AGENT'
 *                                        in the `$_SERVER` superglobal sent in the original request.
 *     @type string $comment_author_IP    Comment author IP address in IPv4 format. Default is the value of
 *                                        'REMOTE_ADDR' in the `$_SERVER` superglobal sent in the original request.
 * }
 * @param bool $avoid_die Should errors be returned as WP_Error objects instead of
 *                        executing wp_die()? Default false.
 * @return int|false|WP_Error The ID of the comment on success, false or WP_Error on failure.
 */
function wp_new_comment( $commentdata, $avoid_die = false ) {
    global $wpdb;

    if ( isset( $commentdata['user_ID'] ) ) {
        $commentdata['user_id'] = $commentdata['user_ID'] = (int) $commentdata['user_ID'];
    }

    $prefiltered_user_id = ( isset( $commentdata['user_id'] ) ) ? (int) $commentdata['user_id'] : 0;

    /**
     * Filters a comment's data before it is sanitized and inserted into the database.
     *
     * @since 1.5.0
     *
     * @param array $commentdata Comment data.
     */
    $commentdata = apply_filters( 'preprocess_comment', $commentdata );

    $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID'];
    if ( isset( $commentdata['user_ID'] ) && $prefiltered_user_id !== (int) $commentdata['user_ID'] ) {
        $commentdata['user_id'] = $commentdata['user_ID'] = (int) $commentdata['user_ID'];
    } elseif ( isset( $commentdata['user_id'] ) ) {
        $commentdata['user_id'] = (int) $commentdata['user_id'];
    }

    $commentdata['comment_parent'] = isset($commentdata['comment_parent']) ? absint($commentdata['comment_parent']) : 0;
    $parent_status = ( 0 < $commentdata['comment_parent'] ) ? wp_get_comment_status($commentdata['comment_parent']) : '';
    $commentdata['comment_parent'] = ( 'approved' == $parent_status || 'unapproved' == $parent_status ) ? $commentdata['comment_parent'] : 0;

    if ( ! isset( $commentdata['comment_author_IP'] ) ) {
        $commentdata['comment_author_IP'] = $_SERVER['REMOTE_ADDR'];
    }
    $commentdata['comment_author_IP'] = preg_replace( '/[^0-9a-fA-F:., ]/', '', $commentdata['comment_author_IP'] );

    if ( ! isset( $commentdata['comment_agent'] ) ) {
        $commentdata['comment_agent'] = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT']: '';
    }
    $commentdata['comment_agent'] = substr( $commentdata['comment_agent'], 0, 254 );

    if ( empty( $commentdata['comment_date'] ) ) {
        $commentdata['comment_date'] = current_time('mysql');
    }

    if ( empty( $commentdata['comment_date_gmt'] ) ) {
        $commentdata['comment_date_gmt'] = current_time( 'mysql', 1 );
    }

    $commentdata = wp_filter_comment($commentdata);

    $commentdata['comment_approved'] = wp_allow_comment( $commentdata, $avoid_die );
    if ( is_wp_error( $commentdata['comment_approved'] ) ) {
        return $commentdata['comment_approved'];
    }

    $comment_ID = wp_insert_comment($commentdata);
    if ( ! $comment_ID ) {
        $fields = array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content' );

        foreach ( $fields as $field ) {
            if ( isset( $commentdata[ $field ] ) ) {
                $commentdata[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->comments, $field, $commentdata[ $field ] );
            }
        }

        $commentdata = wp_filter_comment( $commentdata );

        $commentdata['comment_approved'] = wp_allow_comment( $commentdata, $avoid_die );
        if ( is_wp_error( $commentdata['comment_approved'] ) ) {
            return $commentdata['comment_approved'];
        }

        $comment_ID = wp_insert_comment( $commentdata );
        if ( ! $comment_ID ) {
            return false;
        }
    }

    /**
     * Fires immediately after a comment is inserted into the database.
     *
     * @since 1.2.0
     * @since 4.5.0 The `$commentdata` parameter was added.
     *
     * @param int        $comment_ID       The comment ID.
     * @param int|string $comment_approved 1 if the comment is approved, 0 if not, 'spam' if spam.
     * @param array      $commentdata      Comment data.
     */
    do_action( 'comment_post', $comment_ID, $commentdata['comment_approved'], $commentdata );

    return $comment_ID;
}

/**
 * Send a comment moderation notification to the comment moderator.
 *
 * @since 4.4.0
 *
 * @param int $comment_ID ID of the comment.
 * @return bool True on success, false on failure.
 */
function wp_new_comment_notify_moderator( $comment_ID ) {
    $comment = get_comment( $comment_ID );

    // Only send notifications for pending comments.
    $maybe_notify = ( '0' == $comment->comment_approved );

    /** This filter is documented in wp-includes/comment.php */
    $maybe_notify = apply_filters( 'notify_moderator', $maybe_notify, $comment_ID );

    if ( ! $maybe_notify ) {
        return false;
    }

    return wp_notify_moderator( $comment_ID );
}

/**
 * Send a notification of a new comment to the post author.
 *
 * @since 4.4.0
 *
 * Uses the {@see 'notify_post_author'} filter to determine whether the post author
 * should be notified when a new comment is added, overriding site setting.
 *
 * @param int $comment_ID Comment ID.
 * @return bool True on success, false on failure.
 */
function wp_new_comment_notify_postauthor( $comment_ID ) {
    $comment = get_comment( $comment_ID );

    $maybe_notify = get_option( 'comments_notify' );

    /**
     * Filters whether to send the post author new comment notification emails,
     * overriding the site setting.
     *
     * @since 4.4.0
     *
     * @param bool $maybe_notify Whether to notify the post author about the new comment.
     * @param int  $comment_ID   The ID of the comment for the notification.
     */
    $maybe_notify = apply_filters( 'notify_post_author', $maybe_notify, $comment_ID );

    /*
     * wp_notify_postauthor() checks if notifying the author of their own comment.
     * By default, it won't, but filters can override this.
     */
    if ( ! $maybe_notify ) {
        return false;
    }

    // Only send notifications for approved comments.
    if ( ! isset( $comment->comment_approved ) || '1' != $comment->comment_approved ) {
        return false;
    }

    return wp_notify_postauthor( $comment_ID );
}

/**
 * Sets the status of a comment.
 *
 * The {@see 'wp_set_comment_status'} action is called after the comment is handled.
 * If the comment status is not in the list, then false is returned.
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Comment $comment_id     Comment ID or WP_Comment object.
 * @param string         $comment_status New comment status, either 'hold', 'approve', 'spam', or 'trash'.
 * @param bool           $wp_error       Whether to return a WP_Error object if there is a failure. Default is false.
 * @return bool|WP_Error True on success, false or WP_Error on failure.
 */
function wp_set_comment_status($comment_id, $comment_status, $wp_error = false) {
    global $wpdb;

    switch ( $comment_status ) {
        case 'hold':
        case '0':
            $status = '0';
            break;
        case 'approve':
        case '1':
            $status = '1';
            add_action( 'wp_set_comment_status', 'wp_new_comment_notify_postauthor' );
            break;
        case 'spam':
            $status = 'spam';
            break;
        case 'trash':
            $status = 'trash';
            break;
        default:
            return false;
    }

    $comment_old = clone get_comment($comment_id);

    if ( !$wpdb->update( $wpdb->comments, array('comment_approved' => $status), array( 'comment_ID' => $comment_old->comment_ID ) ) ) {
        if ( $wp_error )
            return new WP_Error('db_update_error', __('Could not update comment status'), $wpdb->last_error);
        else
            return false;
    }

    clean_comment_cache( $comment_old->comment_ID );

    $comment = get_comment( $comment_old->comment_ID );

    /**
     * Fires immediately before transitioning a comment's status from one to another
     * in the database.
     *
     * @since 1.5.0
     *
     * @param int         $comment_id     Comment ID.
     * @param string|bool $comment_status Current comment status. Possible values include
     *                                    'hold', 'approve', 'spam', 'trash', or false.
     */
    do_action( 'wp_set_comment_status', $comment->comment_ID, $comment_status );

    wp_transition_comment_status($comment_status, $comment_old->comment_approved, $comment);

    wp_update_comment_count($comment->comment_post_ID);

    return true;
}

/**
 * Updates an existing comment in the database.
 *
 * Filters the comment and makes sure certain fields are valid before updating.
 *
 * @since 2.0.0
 * @since 4.9.0 Add updating comment meta during comment update.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $commentarr Contains information on the comment.
 * @return int Comment was updated if value is 1, or was not updated if value is 0.
 */
function wp_update_comment($commentarr) {
    global $wpdb;

    // First, get all of the original fields
    $comment = get_comment($commentarr['comment_ID'], ARRAY_A);
    if ( empty( $comment ) ) {
        return 0;
    }

    // Make sure that the comment post ID is valid (if specified).
    if ( ! empty( $commentarr['comment_post_ID'] ) && ! get_post( $commentarr['comment_post_ID'] ) ) {
        return 0;
    }

    // Escape data pulled from DB.
    $comment = wp_slash($comment);

    $old_status = $comment['comment_approved'];

    // Merge old and new fields with new fields overwriting old ones.
    $commentarr = array_merge($comment, $commentarr);

    $commentarr = wp_filter_comment( $commentarr );

    // Now extract the merged array.
    $data = wp_unslash( $commentarr );

    /**
     * Filters the comment content before it is updated in the database.
     *
     * @since 1.5.0
     *
     * @param string $comment_content The comment data.
     */
    $data['comment_content'] = apply_filters( 'comment_save_pre', $data['comment_content'] );

    $data['comment_date_gmt'] = get_gmt_from_date( $data['comment_date'] );

    if ( ! isset( $data['comment_approved'] ) ) {
        $data['comment_approved'] = 1;
    } elseif ( 'hold' == $data['comment_approved'] ) {
        $data['comment_approved'] = 0;
    } elseif ( 'approve' == $data['comment_approved'] ) {
        $data['comment_approved'] = 1;
    }

    $comment_ID = $data['comment_ID'];
    $comment_post_ID = $data['comment_post_ID'];

    /**
     * Filters the comment data immediately before it is updated in the database.
     *
     * Note: data being passed to the filter is already unslashed.
     *
     * @since 4.7.0
     *
     * @param array $data       The new, processed comment data.
     * @param array $comment    The old, unslashed comment data.
     * @param array $commentarr The new, raw comment data.
     */
    $data = apply_filters( 'wp_update_comment_data', $data, $comment, $commentarr );

    $keys = array( 'comment_post_ID', 'comment_content', 'comment_author', 'comment_author_email', 'comment_approved', 'comment_karma', 'comment_author_url', 'comment_date', 'comment_date_gmt', 'comment_type', 'comment_parent', 'user_id', 'comment_agent', 'comment_author_IP' );
    $data = wp_array_slice_assoc( $data, $keys );

    $rval = $wpdb->update( $wpdb->comments, $data, compact( 'comment_ID' ) );

    // If metadata is provided, store it.
    if ( isset( $commentarr['comment_meta'] ) && is_array( $commentarr['comment_meta'] ) ) {
        foreach ( $commentarr['comment_meta'] as $meta_key => $meta_value ) {
            update_comment_meta( $comment_ID, $meta_key, $meta_value );
        }
    }

    clean_comment_cache( $comment_ID );
    wp_update_comment_count( $comment_post_ID );
    /**
     * Fires immediately after a comment is updated in the database.
     *
     * The hook also fires immediately before comment status transition hooks are fired.
     *
     * @since 1.2.0
     * @since 4.6.0 Added the `$data` parameter.
     *
     * @param int   $comment_ID The comment ID.
     * @param array $data       Comment data.
     */
    do_action( 'edit_comment', $comment_ID, $data );
    $comment = get_comment($comment_ID);
    wp_transition_comment_status($comment->comment_approved, $old_status, $comment);
    return $rval;
}

/**
 * Whether to defer comment counting.
 *
 * When setting $defer to true, all post comment counts will not be updated
 * until $defer is set to false. When $defer is set to false, then all
 * previously deferred updated post comment counts will then be automatically
 * updated without having to call wp_update_comment_count() after.
 *
 * @since 2.5.0
 * @staticvar bool $_defer
 *
 * @param bool $defer
 * @return bool
 */
function wp_defer_comment_counting($defer=null) {
    static $_defer = false;

    if ( is_bool($defer) ) {
        $_defer = $defer;
        // flush any deferred counts
        if ( !$defer )
            wp_update_comment_count( null, true );
    }

    return $_defer;
}

/**
 * Updates the comment count for post(s).
 *
 * When $do_deferred is false (is by default) and the comments have been set to
 * be deferred, the post_id will be added to a queue, which will be updated at a
 * later date and only updated once per post ID.
 *
 * If the comments have not be set up to be deferred, then the post will be
 * updated. When $do_deferred is set to true, then all previous deferred post
 * IDs will be updated along with the current $post_id.
 *
 * @since 2.1.0
 * @see wp_update_comment_count_now() For what could cause a false return value
 *
 * @staticvar array $_deferred
 *
 * @param int|null $post_id     Post ID.
 * @param bool     $do_deferred Optional. Whether to process previously deferred
 *                              post comment counts. Default false.
 * @return bool|void True on success, false on failure or if post with ID does
 *                   not exist.
 */
function wp_update_comment_count($post_id, $do_deferred=false) {
    static $_deferred = array();

    if ( empty( $post_id ) && ! $do_deferred ) {
        return false;
    }

    if ( $do_deferred ) {
        $_deferred = array_unique($_deferred);
        foreach ( $_deferred as $i => $_post_id ) {
            wp_update_comment_count_now($_post_id);
            unset( $_deferred[$i] ); /** @todo Move this outside of the foreach and reset $_deferred to an array instead */
        }
    }

    if ( wp_defer_comment_counting() ) {
        $_deferred[] = $post_id;
        return true;
    }
    elseif ( $post_id ) {
        return wp_update_comment_count_now($post_id);
    }

}

/**
 * Updates the comment count for the post.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $post_id Post ID
 * @return bool True on success, false on '0' $post_id or if post with ID does not exist.
 */
function wp_update_comment_count_now($post_id) {
    global $wpdb;
    $post_id = (int) $post_id;
    if ( !$post_id )
        return false;

    wp_cache_delete( 'comments-0', 'counts' );
    wp_cache_delete( "comments-{$post_id}", 'counts' );

    if ( !$post = get_post($post_id) )
        return false;

    $old = (int) $post->comment_count;

    /**
     * Filters a post's comment count before it is updated in the database.
     *
     * @since 4.5.0
     *
     * @param int $new     The new comment count. Default null.
     * @param int $old     The old comment count.
     * @param int $post_id Post ID.
     */
    $new = apply_filters( 'pre_wp_update_comment_count_now', null, $old, $post_id );

    if ( is_null( $new ) ) {
        $new = (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id ) );
    } else {
        $new = (int) $new;
    }

    $wpdb->update( $wpdb->posts, array('comment_count' => $new), array('ID' => $post_id) );

    clean_post_cache( $post );

    /**
     * Fires immediately after a post's comment count is updated in the database.
     *
     * @since 2.3.0
     *
     * @param int $post_id Post ID.
     * @param int $new     The new comment count.
     * @param int $old     The old comment count.
     */
    do_action( 'wp_update_comment_count', $post_id, $new, $old );
    /** This action is documented in wp-includes/post.php */
    do_action( 'edit_post', $post_id, $post );

    return true;
}

//
// Ping and trackback functions.
//

/**
 * Finds a pingback server URI based on the given URL.
 *
 * Checks the HTML for the rel="pingback" link and x-pingback headers. It does
 * a check for the x-pingback headers first and returns that, if available. The
 * check for the rel="pingback" has more overhead than just the header.
 *
 * @since 1.5.0
 *
 * @param string $url URL to ping.
 * @param int $deprecated Not Used.
 * @return false|string False on failure, string containing URI on success.
 */
function discover_pingback_server_uri( $url, $deprecated = '' ) {
    if ( !empty( $deprecated ) )
        _deprecated_argument( __FUNCTION__, '2.7.0' );

    $pingback_str_dquote = 'rel="pingback"';
    $pingback_str_squote = 'rel=\'pingback\'';

    /** @todo Should use Filter Extension or custom preg_match instead. */
    $parsed_url = parse_url($url);

    if ( ! isset( $parsed_url['host'] ) ) // Not a URL. This should never happen.
        return false;

    //Do not search for a pingback server on our own uploads
    $uploads_dir = wp_get_upload_dir();
    if ( 0 === strpos($url, $uploads_dir['baseurl']) )
        return false;

    $response = wp_safe_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );

    if ( is_wp_error( $response ) )
        return false;

    if ( wp_remote_retrieve_header( $response, 'x-pingback' ) )
        return wp_remote_retrieve_header( $response, 'x-pingback' );

    // Not an (x)html, sgml, or xml page, no use going further.
    if ( preg_match('#(image|audio|video|model)/#is', wp_remote_retrieve_header( $response, 'content-type' )) )
        return false;

    // Now do a GET since we're going to look in the html headers (and we're sure it's not a binary file)
    $response = wp_safe_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );

    if ( is_wp_error( $response ) )
        return false;

    $contents = wp_remote_retrieve_body( $response );

    $pingback_link_offset_dquote = strpos($contents, $pingback_str_dquote);
    $pingback_link_offset_squote = strpos($contents, $pingback_str_squote);
    if ( $pingback_link_offset_dquote || $pingback_link_offset_squote ) {
        $quote = ($pingback_link_offset_dquote) ? '"' : '\'';
        $pingback_link_offset = ($quote=='"') ? $pingback_link_offset_dquote : $pingback_link_offset_squote;
        $pingback_href_pos = @strpos($contents, 'href=', $pingback_link_offset);
        $pingback_href_start = $pingback_href_pos+6;
        $pingback_href_end = @strpos($contents, $quote, $pingback_href_start);
        $pingback_server_url_len = $pingback_href_end - $pingback_href_start;
        $pingback_server_url = substr($contents, $pingback_href_start, $pingback_server_url_len);

        // We may find rel="pingback" but an incomplete pingback URL
        if ( $pingback_server_url_len > 0 ) { // We got it!
            return $pingback_server_url;
        }
    }

    return false;
}

/**
 * Perform all pingbacks, enclosures, trackbacks, and send to pingback services.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function do_all_pings() {
    global $wpdb;

    // Do pingbacks
    while ($ping = $wpdb->get_row("SELECT ID, post_content, meta_id FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_pingme' LIMIT 1")) {
        delete_metadata_by_mid( 'post', $ping->meta_id );
        pingback( $ping->post_content, $ping->ID );
    }

    // Do Enclosures
    while ($enclosure = $wpdb->get_row("SELECT ID, post_content, meta_id FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_encloseme' LIMIT 1")) {
        delete_metadata_by_mid( 'post', $enclosure->meta_id );
        do_enclose( $enclosure->post_content, $enclosure->ID );
    }

    // Do Trackbacks
    $trackbacks = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE to_ping <> '' AND post_status = 'publish'");
    if ( is_array($trackbacks) )
        foreach ( $trackbacks as $trackback )
            do_trackbacks($trackback);

    //Do Update Services/Generic Pings
    generic_ping();
}

/**
 * Perform trackbacks.
 *
 * @since 1.5.0
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post $post_id Post object or ID to do trackbacks on.
 */
function do_trackbacks( $post_id ) {
    global $wpdb;
    $post = get_post( $post_id );
    if ( ! $post ) {
        return false;
    }

    $to_ping = get_to_ping( $post );
    $pinged  = get_pung( $post );
    if ( empty( $to_ping ) ) {
        $wpdb->update($wpdb->posts, array( 'to_ping' => '' ), array( 'ID' => $post->ID ) );
        return;
    }

    if ( empty($post->post_excerpt) ) {
        /** This filter is documented in wp-includes/post-template.php */
        $excerpt = apply_filters( 'the_content', $post->post_content, $post->ID );
    } else {
        /** This filter is documented in wp-includes/post-template.php */
        $excerpt = apply_filters( 'the_excerpt', $post->post_excerpt );
    }

    $excerpt = str_replace(']]>', ']]>', $excerpt);
    $excerpt = wp_html_excerpt($excerpt, 252, '…');

    /** This filter is documented in wp-includes/post-template.php */
    $post_title = apply_filters( 'the_title', $post->post_title, $post->ID );
    $post_title = strip_tags($post_title);

    if ( $to_ping ) {
        foreach ( (array) $to_ping as $tb_ping ) {
            $tb_ping = trim($tb_ping);
            if ( !in_array($tb_ping, $pinged) ) {
                trackback( $tb_ping, $post_title, $excerpt, $post->ID );
                $pinged[] = $tb_ping;
            } else {
                $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, %s,
                    '')) WHERE ID = %d", $tb_ping, $post->ID ) );
            }
        }
    }
}

/**
 * Sends pings to all of the ping site services.
 *
 * @since 1.2.0
 *
 * @param int $post_id Post ID.
 * @return int Same as Post ID from parameter
 */
function generic_ping( $post_id = 0 ) {
    $services = get_option('ping_sites');

    $services = explode("\n", $services);
    foreach ( (array) $services as $service ) {
        $service = trim($service);
        if ( '' != $service )
            weblog_ping($service);
    }

    return $post_id;
}

/**
 * Pings back the links found in a post.
 *
 * @since 0.71
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @param string $content Post content to check for links. If empty will retrieve from post.
 * @param int|WP_Post $post_id Post Object or ID.
 */
function pingback( $content, $post_id ) {
    include_once( ABSPATH . WPINC . '/class-IXR.php' );
    include_once( ABSPATH . WPINC . '/class-wp-http-ixr-client.php' );

    // original code by Mort (http://mort.mine.nu:8080)
    $post_links = array();

    $post = get_post( $post_id );
    if ( ! $post ) {
        return;
    }

    $pung = get_pung( $post );

    if ( empty( $content ) ) {
        $content = $post->post_content;
    }

    // Step 1
    // Parsing the post, external links (if any) are stored in the $post_links array
    $post_links_temp = wp_extract_urls( $content );

    // Step 2.
    // Walking thru the links array
    // first we get rid of links pointing to sites, not to specific files
    // Example:
    // http://dummy-weblog.org
    // http://dummy-weblog.org/
    // http://dummy-weblog.org/post.php
    // We don't wanna ping first and second types, even if they have a valid <link/>

    foreach ( (array) $post_links_temp as $link_test ) :
        if ( ! in_array( $link_test, $pung ) && ( url_to_postid( $link_test ) != $post->ID ) // If we haven't pung it already and it isn't a link to itself
                && !is_local_attachment($link_test) ) : // Also, let's never ping local attachments.
            if ( $test = @parse_url($link_test) ) {
                if ( isset($test['query']) )
                    $post_links[] = $link_test;
                elseif ( isset( $test['path'] ) && ( $test['path'] != '/' ) && ( $test['path'] != '' ) )
                    $post_links[] = $link_test;
            }
        endif;
    endforeach;

    $post_links = array_unique( $post_links );
    /**
     * Fires just before pinging back links found in a post.
     *
     * @since 2.0.0
     *
     * @param array $post_links An array of post links to be checked (passed by reference).
     * @param array $pung       Whether a link has already been pinged (passed by reference).
     * @param int   $post_ID    The post ID.
     */
    do_action_ref_array( 'pre_ping', array( &$post_links, &$pung, $post->ID ) );

    foreach ( (array) $post_links as $pagelinkedto ) {
        $pingback_server_url = discover_pingback_server_uri( $pagelinkedto );

        if ( $pingback_server_url ) {
            @ set_time_limit( 60 );
            // Now, the RPC call
            $pagelinkedfrom = get_permalink( $post );

            // using a timeout of 3 seconds should be enough to cover slow servers
            $client = new WP_HTTP_IXR_Client($pingback_server_url);
            $client->timeout = 3;
            /**
             * Filters the user agent sent when pinging-back a URL.
             *
             * @since 2.9.0
             *
             * @param string $concat_useragent    The user agent concatenated with ' -- WordPress/'
             *                                    and the WordPress version.
             * @param string $useragent           The useragent.
             * @param string $pingback_server_url The server URL being linked to.
             * @param string $pagelinkedto        URL of page linked to.
             * @param string $pagelinkedfrom      URL of page linked from.
             */
            $client->useragent = apply_filters( 'pingback_useragent', $client->useragent . ' -- WordPress/' . get_bloginfo( 'version' ), $client->useragent, $pingback_server_url, $pagelinkedto, $pagelinkedfrom );
            // when set to true, this outputs debug messages by itself
            $client->debug = false;

            if ( $client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || ( isset($client->error->code) && 48 == $client->error->code ) ) // Already registered
                add_ping( $post, $pagelinkedto );
        }
    }
}

/**
 * Check whether blog is public before returning sites.
 *
 * @since 2.1.0
 *
 * @param mixed $sites Will return if blog is public, will not return if not public.
 * @return mixed Empty string if blog is not public, returns $sites, if site is public.
 */
function privacy_ping_filter($sites) {
    if ( '0' != get_option('blog_public') )
        return $sites;
    else
        return '';
}

/**
 * Send a Trackback.
 *
 * Updates database when sending trackback to prevent duplicates.
 *
 * @since 0.71
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $trackback_url URL to send trackbacks.
 * @param string $title Title of post.
 * @param string $excerpt Excerpt of post.
 * @param int $ID Post ID.
 * @return int|false|void Database query from update.
 */
function trackback($trackback_url, $title, $excerpt, $ID) {
    global $wpdb;

    if ( empty($trackback_url) )
        return;

    $options = array();
    $options['timeout'] = 10;
    $options['body'] = array(
        'title' => $title,
        'url' => get_permalink($ID),
        'blog_name' => get_option('blogname'),
        'excerpt' => $excerpt
    );

    $response = wp_safe_remote_post( $trackback_url, $options );

    if ( is_wp_error( $response ) )
        return;

    $wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET pinged = CONCAT(pinged, '\n', %s) WHERE ID = %d", $trackback_url, $ID) );
    return $wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, %s, '')) WHERE ID = %d", $trackback_url, $ID) );
}

/**
 * Send a pingback.
 *
 * @since 1.2.0
 *
 * @param string $server Host of blog to connect to.
 * @param string $path Path to send the ping.
 */
function weblog_ping($server = '', $path = '') {
    include_once( ABSPATH . WPINC . '/class-IXR.php' );
    include_once( ABSPATH . WPINC . '/class-wp-http-ixr-client.php' );

    // using a timeout of 3 seconds should be enough to cover slow servers
    $client = new WP_HTTP_IXR_Client($server, ((!strlen(trim($path)) || ('/' == $path)) ? false : $path));
    $client->timeout = 3;
    $client->useragent .= ' -- WordPress/' . get_bloginfo( 'version' );

    // when set to true, this outputs debug messages by itself
    $client->debug = false;
    $home = trailingslashit( home_url() );
    if ( !$client->query('weblogUpdates.extendedPing', get_option('blogname'), $home, get_bloginfo('rss2_url') ) ) // then try a normal ping
        $client->query('weblogUpdates.ping', get_option('blogname'), $home);
}

/**
 * Default filter attached to pingback_ping_source_uri to validate the pingback's Source URI
 *
 * @since 3.5.1
 * @see wp_http_validate_url()
 *
 * @param string $source_uri
 * @return string
 */
function pingback_ping_source_uri( $source_uri ) {
    return (string) wp_http_validate_url( $source_uri );
}

/**
 * Default filter attached to xmlrpc_pingback_error.
 *
 * Returns a generic pingback error code unless the error code is 48,
 * which reports that the pingback is already registered.
 *
 * @since 3.5.1
 * @link https://www.hixie.ch/specs/pingback/pingback#TOC3
 *
 * @param IXR_Error $ixr_error
 * @return IXR_Error
 */
function xmlrpc_pingback_error( $ixr_error ) {
    if ( $ixr_error->code === 48 )
        return $ixr_error;
    return new IXR_Error( 0, '' );
}

//
// Cache
//

/**
 * Removes a comment from the object cache.
 *
 * @since 2.3.0
 *
 * @param int|array $ids Comment ID or an array of comment IDs to remove from cache.
 */
function clean_comment_cache($ids) {
    foreach ( (array) $ids as $id ) {
        wp_cache_delete( $id, 'comment' );

        /**
         * Fires immediately after a comment has been removed from the object cache.
         *
         * @since 4.5.0
         *
         * @param int $id Comment ID.
         */
        do_action( 'clean_comment_cache', $id );
    }

    wp_cache_set( 'last_changed', microtime(), 'comment' );
}

/**
 * Updates the comment cache of given comments.
 *
 * Will add the comments in $comments to the cache. If comment ID already exists
 * in the comment cache then it will not be updated. The comment is added to the
 * cache using the comment group with the key using the ID of the comments.
 *
 * @since 2.3.0
 * @since 4.4.0 Introduced the `$update_meta_cache` parameter.
 *
 * @param array $comments          Array of comment row objects
 * @param bool  $update_meta_cache Whether to update commentmeta cache. Default true.
 */
function update_comment_cache( $comments, $update_meta_cache = true ) {
    foreach ( (array) $comments as $comment )
        wp_cache_add($comment->comment_ID, $comment, 'comment');

    if ( $update_meta_cache ) {
        // Avoid `wp_list_pluck()` in case `$comments` is passed by reference.
        $comment_ids = array();
        foreach ( $comments as $comment ) {
            $comment_ids[] = $comment->comment_ID;
        }
        update_meta_cache( 'comment', $comment_ids );
    }
}

/**
 * Adds any comments from the given IDs to the cache that do not already exist in cache.
 *
 * @since 4.4.0
 * @access private
 *
 * @see update_comment_cache()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $comment_ids       Array of comment IDs.
 * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function _prime_comment_caches( $comment_ids, $update_meta_cache = true ) {
    global $wpdb;

    $non_cached_ids = _get_non_cached_ids( $comment_ids, 'comment' );
    if ( !empty( $non_cached_ids ) ) {
        $fresh_comments = $wpdb->get_results( sprintf( "SELECT $wpdb->comments.* FROM $wpdb->comments WHERE comment_ID IN (%s)", join( ",", array_map( 'intval', $non_cached_ids ) ) ) );

        update_comment_cache( $fresh_comments, $update_meta_cache );
    }
}

//
// Internal
//

/**
 * Close comments on old posts on the fly, without any extra DB queries. Hooked to the_posts.
 *
 * @access private
 * @since 2.7.0
 *
 * @param WP_Post  $posts Post data object.
 * @param WP_Query $query Query object.
 * @return array
 */
function _close_comments_for_old_posts( $posts, $query ) {
    if ( empty( $posts ) || ! $query->is_singular() || ! get_option( 'close_comments_for_old_posts' ) )
        return $posts;

    /**
     * Filters the list of post types to automatically close comments for.
     *
     * @since 3.2.0
     *
     * @param array $post_types An array of registered post types. Default array with 'post'.
     */
    $post_types = apply_filters( 'close_comments_for_post_types', array( 'post' ) );
    if ( ! in_array( $posts[0]->post_type, $post_types ) )
        return $posts;

    $days_old = (int) get_option( 'close_comments_days_old' );
    if ( ! $days_old )
        return $posts;

    if ( time() - strtotime( $posts[0]->post_date_gmt ) > ( $days_old * DAY_IN_SECONDS ) ) {
        $posts[0]->comment_status = 'closed';
        $posts[0]->ping_status = 'closed';
    }

    return $posts;
}

/**
 * Close comments on an old post. Hooked to comments_open and pings_open.
 *
 * @access private
 * @since 2.7.0
 *
 * @param bool $open Comments open or closed
 * @param int $post_id Post ID
 * @return bool $open
 */
function _close_comments_for_old_post( $open, $post_id ) {
    if ( ! $open )
        return $open;

    if ( !get_option('close_comments_for_old_posts') )
        return $open;

    $days_old = (int) get_option('close_comments_days_old');
    if ( !$days_old )
        return $open;

    $post = get_post($post_id);

    /** This filter is documented in wp-includes/comment.php */
    $post_types = apply_filters( 'close_comments_for_post_types', array( 'post' ) );
    if ( ! in_array( $post->post_type, $post_types ) )
        return $open;

    // Undated drafts should not show up as comments closed.
    if ( '0000-00-00 00:00:00' === $post->post_date_gmt ) {
        return $open;
    }

    if ( time() - strtotime( $post->post_date_gmt ) > ( $days_old * DAY_IN_SECONDS ) )
        return false;

    return $open;
}

/**
 * Handles the submission of a comment, usually posted to wp-comments-post.php via a comment form.
 *
 * This function expects unslashed data, as opposed to functions such as `wp_new_comment()` which
 * expect slashed data.
 *
 * @since 4.4.0
 *
 * @param array $comment_data {
 *     Comment data.
 *
 *     @type string|int $comment_post_ID             The ID of the post that relates to the comment.
 *     @type string     $author                      The name of the comment author.
 *     @type string     $email                       The comment author email address.
 *     @type string     $url                         The comment author URL.
 *     @type string     $comment                     The content of the comment.
 *     @type string|int $comment_parent              The ID of this comment's parent, if any. Default 0.
 *     @type string     $_wp_unfiltered_html_comment The nonce value for allowing unfiltered HTML.
 * }
 * @return WP_Comment|WP_Error A WP_Comment object on success, a WP_Error object on failure.
 */
function wp_handle_comment_submission( $comment_data ) {

    $comment_post_ID = $comment_parent = 0;
    $comment_author = $comment_author_email = $comment_author_url = $comment_content = null;

    if ( isset( $comment_data['comment_post_ID'] ) ) {
        $comment_post_ID = (int) $comment_data['comment_post_ID'];
    }
    if ( isset( $comment_data['author'] ) && is_string( $comment_data['author'] ) ) {
        $comment_author = trim( strip_tags( $comment_data['author'] ) );
    }
    if ( isset( $comment_data['email'] ) && is_string( $comment_data['email'] ) ) {
        $comment_author_email = trim( $comment_data['email'] );
    }
    if ( isset( $comment_data['url'] ) && is_string( $comment_data['url'] ) ) {
        $comment_author_url = trim( $comment_data['url'] );
    }
    if ( isset( $comment_data['comment'] ) && is_string( $comment_data['comment'] ) ) {
        $comment_content = trim( $comment_data['comment'] );
    }
    if ( isset( $comment_data['comment_parent'] ) ) {
        $comment_parent = absint( $comment_data['comment_parent'] );
    }

    $post = get_post( $comment_post_ID );

    if ( empty( $post->comment_status ) ) {

        /**
         * Fires when a comment is attempted on a post that does not exist.
         *
         * @since 1.5.0
         *
         * @param int $comment_post_ID Post ID.
         */
        do_action( 'comment_id_not_found', $comment_post_ID );

        return new WP_Error( 'comment_id_not_found' );

    }

    // get_post_status() will get the parent status for attachments.
    $status = get_post_status( $post );

    if ( ( 'private' == $status ) && ! current_user_can( 'read_post', $comment_post_ID ) ) {
        return new WP_Error( 'comment_id_not_found' );
    }

    $status_obj = get_post_status_object( $status );

    if ( ! comments_open( $comment_post_ID ) ) {

        /**
         * Fires when a comment is attempted on a post that has comments closed.
         *
         * @since 1.5.0
         *
         * @param int $comment_post_ID Post ID.
         */
        do_action( 'comment_closed', $comment_post_ID );

        return new WP_Error( 'comment_closed', __( 'Sorry, comments are closed for this item.' ), 403 );

    } elseif ( 'trash' == $status ) {

        /**
         * Fires when a comment is attempted on a trashed post.
         *
         * @since 2.9.0
         *
         * @param int $comment_post_ID Post ID.
         */
        do_action( 'comment_on_trash', $comment_post_ID );

        return new WP_Error( 'comment_on_trash' );

    } elseif ( ! $status_obj->public && ! $status_obj->private ) {

        /**
         * Fires when a comment is attempted on a post in draft mode.
         *
         * @since 1.5.1
         *
         * @param int $comment_post_ID Post ID.
         */
        do_action( 'comment_on_draft', $comment_post_ID );

        if ( current_user_can( 'read_post', $comment_post_ID ) ) {
            return new WP_Error( 'comment_on_draft', __( 'Sorry, comments are not allowed for this item.' ), 403 );
        } else {
            return new WP_Error( 'comment_on_draft' );
        }

    } elseif ( post_password_required( $comment_post_ID ) ) {

        /**
         * Fires when a comment is attempted on a password-protected post.
         *
         * @since 2.9.0
         *
         * @param int $comment_post_ID Post ID.
         */
        do_action( 'comment_on_password_protected', $comment_post_ID );

        return new WP_Error( 'comment_on_password_protected' );

    } else {

        /**
         * Fires before a comment is posted.
         *
         * @since 2.8.0
         *
         * @param int $comment_post_ID Post ID.
         */
        do_action( 'pre_comment_on_post', $comment_post_ID );

    }

    // If the user is logged in
    $user = wp_get_current_user();
    if ( $user->exists() ) {
        if ( empty( $user->display_name ) ) {
            $user->display_name=$user->user_login;
        }
        $comment_author       = $user->display_name;
        $comment_author_email = $user->user_email;
        $comment_author_url   = $user->user_url;
        $user_ID              = $user->ID;
        if ( current_user_can( 'unfiltered_html' ) ) {
            if ( ! isset( $comment_data['_wp_unfiltered_html_comment'] )
                || ! wp_verify_nonce( $comment_data['_wp_unfiltered_html_comment'], 'unfiltered-html-comment_' . $comment_post_ID )
            ) {
                kses_remove_filters(); // start with a clean slate
                kses_init_filters(); // set up the filters
            }
        }
    } else {
        if ( get_option( 'comment_registration' ) ) {
            return new WP_Error( 'not_logged_in', __( 'Sorry, you must be logged in to comment.' ), 403 );
        }
    }

    $comment_type = '';

    if ( get_option( 'require_name_email' ) && ! $user->exists() ) {
        if ( '' == $comment_author_email || '' == $comment_author ) {
            return new WP_Error( 'require_name_email', __( '<strong>ERROR</strong>: please fill the required fields (name, email).' ), 200 );
        } elseif ( ! is_email( $comment_author_email ) ) {
            return new WP_Error( 'require_valid_email', __( '<strong>ERROR</strong>: please enter a valid email address.' ), 200 );
        }
    }

    if ( '' == $comment_content ) {
        return new WP_Error( 'require_valid_comment', __( '<strong>ERROR</strong>: please type a comment.' ), 200 );
    }

    $commentdata = compact(
        'comment_post_ID',
        'comment_author',
        'comment_author_email',
        'comment_author_url',
        'comment_content',
        'comment_type',
        'comment_parent',
        'user_ID'
    );

    $check_max_lengths = wp_check_comment_data_max_lengths( $commentdata );
    if ( is_wp_error( $check_max_lengths ) ) {
        return $check_max_lengths;
    }

    $comment_id = wp_new_comment( wp_slash( $commentdata ), true );
    if ( is_wp_error( $comment_id ) ) {
        return $comment_id;
    }

    if ( ! $comment_id ) {
        return new WP_Error( 'comment_save_error', __( '<strong>ERROR</strong>: The comment could not be saved. Please try again later.' ), 500 );
    }

    return get_comment( $comment_id );
}