comment.php

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<?php
function check_comment($author, $email, $url, $comment, $user_ip, $user_agent, $comment_type) {
    global $wpdb;

    if ( 1 == get_option('comment_moderation') )
        return false; // If moderation is set to manual

    $comment = apply_filters( 'comment_text', $comment );

    // Check # of external links
    if ( $max_links = get_option( 'comment_max_links' ) ) {
        $num_links = preg_match_all( '/<a [^>]*href/i', $comment, $out );
        $num_links = apply_filters( 'comment_max_links_url', $num_links, $url ); // provide for counting of $url as a link
        if ( $num_links >= $max_links )
            return false;
    }

    $mod_keys = trim(get_option('moderation_keys'));
    if ( !empty($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 '#' chars in the
            // spam words don't break things:
            $word = preg_quote($word, '#');

            $pattern = "#$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;
        }
    }

    // Comment whitelisting:
    if ( 1 == get_option('comment_whitelist')) {
        if ( 'trackback' != $comment_type && 'pingback' != $comment_type && $author != '' && $email != '' ) {
            // expected_slashed ($author, $email)
            $ok_to_comment = $wpdb->get_var("SELECT comment_approved FROM $wpdb->comments WHERE comment_author = '$author' AND comment_author_email = '$email' and comment_approved = '1' LIMIT 1");
            if ( ( 1 == $ok_to_comment ) &&
                ( empty($mod_keys) || false === strpos( $email, $mod_keys) ) )
                    return true;
            else
                return false;
        } else {
            return false;
        }
    }
    return true;
}

function get_approved_comments($post_id) {
    global $wpdb;
    return $wpdb->get_results($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1' ORDER BY comment_date", $post_id));
}

function get_comment(&$comment, $output = OBJECT) {
    global $wpdb;
    $null = null;

    if ( empty($comment) ) {
        if ( isset($GLOBALS['comment']) )
            $_comment = & $GLOBALS['comment'];
        else
            $_comment = null;
    } elseif ( is_object($comment) ) {
        wp_cache_add($comment->comment_ID, $comment, 'comment');
        $_comment = $comment;
    } else {
        if ( isset($GLOBALS['comment']) && ($GLOBALS['comment']->comment_ID == $comment) ) {
            $_comment = & $GLOBALS['comment'];
        } elseif ( ! $_comment = wp_cache_get($comment, 'comment') ) {
            $_comment = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_ID = %d LIMIT 1", $comment));
            if ( ! $_comment )
                return $null;
            wp_cache_add($_comment->comment_ID, $_comment, 'comment');
        }
    }

    $_comment = apply_filters('get_comment', $_comment);

    if ( $output == OBJECT ) {
        return $_comment;
    } elseif ( $output == ARRAY_A ) {
        $__comment = get_object_vars($_comment);
        return $__comment;
    } elseif ( $output == ARRAY_N ) {
        $__comment = array_values(get_object_vars($_comment));
        return $__comment;
    } else {
        return $_comment;
    }
}

function get_comments( $args = '' ) {
    $query = new WP_Comment_Query;
    return $query->query( $args );
}

class WP_Comment_Query {
    var $meta_query = false;

    function query( $query_vars ) {
        global $wpdb;

        $defaults = array(
            'author_email' => '',
            'ID' => '',
            'karma' => '',
            'number' => '',
            'offset' => '',
            'orderby' => '',
            'order' => 'DESC',
            'parent' => '',
            'post_ID' => '',
            'post_id' => 0,
            'post_author' => '',
            'post_name' => '',
            'post_parent' => '',
            'post_status' => '',
            'post_type' => '',
            'status' => '',
            'type' => '',
            'user_id' => '',
            'search' => '',
            'count' => false,
            'meta_key' => '',
            'meta_value' => '',
            'meta_query' => '',
        );

        $groupby = '';

        $this->query_vars = wp_parse_args( $query_vars, $defaults );

        // Parse meta query
        $this->meta_query = new WP_Meta_Query();
        $this->meta_query->parse_query_vars( $this->query_vars );

        do_action_ref_array( 'pre_get_comments', array( &$this ) );
        extract( $this->query_vars, EXTR_SKIP );

        // $args can be whatever, only use the args defined in defaults to compute the key
        $key = md5( serialize( compact(array_keys($defaults)) )  );
        $last_changed = wp_cache_get( 'last_changed', 'comment' );
        if ( ! $last_changed )
            $last_changed = wp_cache_set( 'last_changed', 1, 'comment' );
        $cache_key = "get_comments:$key:$last_changed";

        if ( $cache = wp_cache_get( $cache_key, 'comment' ) )
            return $cache;

        $post_id = absint($post_id);

        if ( 'hold' == $status )
            $approved = "comment_approved = '0'";
        elseif ( 'approve' == $status )
            $approved = "comment_approved = '1'";
        elseif ( ! empty( $status ) && 'all' != $status )
            $approved = $wpdb->prepare( "comment_approved = %s", $status );
        else
            $approved = "( comment_approved = '0' OR comment_approved = '1' )";

        $order = ( 'ASC' == strtoupper($order) ) ? 'ASC' : 'DESC';

        if ( ! empty( $orderby ) ) {
            $ordersby = is_array($orderby) ? $orderby : preg_split('/[,\s]/', $orderby);
            $allowed_keys = array(
                'comment_agent',
                'comment_approved',
                'comment_author',
                'comment_author_email',
                'comment_author_IP',
                'comment_author_url',
                'comment_content',
                'comment_date',
                'comment_date_gmt',
                'comment_ID',
                'comment_karma',
                'comment_parent',
                'comment_post_ID',
                'comment_type',
                'user_id',
            );
            if ( ! empty( $this->query_vars['meta_key'] ) ) {
                $allowed_keys[] = $this->query_vars['meta_key'];
                $allowed_keys[] = 'meta_value';
                $allowed_keys[] = 'meta_value_num';
            }
            $ordersby = array_intersect( $ordersby, $allowed_keys );
            foreach ( $ordersby as $key => $value ) {
                if ( $value == $this->query_vars['meta_key'] || $value == 'meta_value' ) {
                    $ordersby[ $key ] = "$wpdb->commentmeta.meta_value";
                } elseif ( $value == 'meta_value_num' ) {
                    $ordersby[ $key ] = "$wpdb->commentmeta.meta_value+0";
                }
            }
            $orderby = empty( $ordersby ) ? 'comment_date_gmt' : implode(', ', $ordersby);
        } else {
            $orderby = 'comment_date_gmt';
        }

        $number = absint($number);
        $offset = absint($offset);

        if ( !empty($number) ) {
            if ( $offset )
                $limits = 'LIMIT ' . $offset . ',' . $number;
            else
                $limits = 'LIMIT ' . $number;
        } else {
            $limits = '';
        }

        if ( $count )
            $fields = 'COUNT(*)';
        else
            $fields = '*';

        $join = '';
        $where = $approved;

        if ( ! empty($post_id) )
            $where .= $wpdb->prepare( ' AND comment_post_ID = %d', $post_id );
        if ( '' !== $author_email )
            $where .= $wpdb->prepare( ' AND comment_author_email = %s', $author_email );
        if ( '' !== $karma )
            $where .= $wpdb->prepare( ' AND comment_karma = %d', $karma );
        if ( 'comment' == $type ) {
            $where .= " AND comment_type = ''";
        } elseif( 'pings' == $type ) {
            $where .= ' AND comment_type IN ("pingback", "trackback")';
        } elseif ( ! empty( $type ) ) {
            $where .= $wpdb->prepare( ' AND comment_type = %s', $type );
        }
        if ( '' !== $parent )
            $where .= $wpdb->prepare( ' AND comment_parent = %d', $parent );
        if ( '' !== $user_id )
            $where .= $wpdb->prepare( ' AND user_id = %d', $user_id );
        if ( '' !== $search )
            $where .= $this->get_search_sql( $search, array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_content' ) );

        $post_fields = array_filter( compact( array( 'post_author', 'post_name', 'post_parent', 'post_status', 'post_type', ) ) );
        if ( ! empty( $post_fields ) ) {
            $join = "JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID";
            foreach( $post_fields as $field_name => $field_value )
                $where .= $wpdb->prepare( " AND {$wpdb->posts}.{$field_name} = %s", $field_value );
        }

        if ( ! empty( $this->meta_query->queries ) ) {
            $clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this );
            $join .= $clauses['join'];
            $where .= $clauses['where'];
            $groupby = "{$wpdb->comments}.comment_ID";
        }

        $pieces = array( 'fields', 'join', 'where', 'orderby', 'order', 'limits', 'groupby' );
        $clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) );
        foreach ( $pieces as $piece )
            $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : '';

        if ( $groupby )
            $groupby = 'GROUP BY ' . $groupby;

        $query = "SELECT $fields FROM $wpdb->comments $join WHERE $where $groupby ORDER BY $orderby $order $limits";

        if ( $count )
            return $wpdb->get_var( $query );

        $comments = $wpdb->get_results( $query );
        $comments = apply_filters_ref_array( 'the_comments', array( $comments, &$this ) );

        wp_cache_add( $cache_key, $comments, 'comment' );

        return $comments;
    }

    /*
     * Used internally to generate an SQL string for searching across multiple columns
     *
     * @access protected
     * @since 3.1.0
     *
     * @param string $string
     * @param array $cols
     * @return string
     */
    function get_search_sql( $string, $cols ) {
        $string = esc_sql( like_escape( $string ) );

        $searches = array();
        foreach ( $cols as $col )
            $searches[] = "$col LIKE '%$string%'";

        return ' AND (' . implode(' OR ', $searches) . ')';
    }
}

function get_comment_statuses( ) {
    $status = array(
        'hold'      => __('Unapproved'),
        /* translators: comment status  */
        'approve'   => _x('Approved', 'adjective'),
        /* translators: comment status */
        'spam'      => _x('Spam', 'adjective'),
    );

    return $status;
}

function get_lastcommentmodified($timezone = 'server') {
    global $wpdb;
    static $cache_lastcommentmodified = array();

    if ( isset($cache_lastcommentmodified[$timezone]) )
        return $cache_lastcommentmodified[$timezone];

    $add_seconds_server = date('Z');

    switch ( strtolower($timezone)) {
        case 'gmt':
            $lastcommentmodified = $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':
            $lastcommentmodified = $wpdb->get_var("SELECT comment_date FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
            break;
        case 'server':
            $lastcommentmodified = $wpdb->get_var($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;
    }

    $cache_lastcommentmodified[$timezone] = $lastcommentmodified;

    return $lastcommentmodified;
}

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,
        "total_comments"        => 0
    );

    foreach ( $totals as $row ) {
        switch ( $row['comment_approved'] ) {
            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'];
                break;
            case 0:
                $comment_count['awaiting_moderation'] = $row['total'];
                $comment_count['total_comments'] += $row['total'];
                break;
            default:
                break;
        }
    }

    return $comment_count;
}

//
// Comment meta functions
//

function add_comment_meta($comment_id, $meta_key, $meta_value, $unique = false) {
    return add_metadata('comment', $comment_id, $meta_key, $meta_value, $unique);
}

function delete_comment_meta($comment_id, $meta_key, $meta_value = '') {
    return delete_metadata('comment', $comment_id, $meta_key, $meta_value);
}

function get_comment_meta($comment_id, $key = '', $single = false) {
    return get_metadata('comment', $comment_id, $key, $single);
}

function update_comment_meta($comment_id, $meta_key, $meta_value, $prev_value = '') {
    return update_metadata('comment', $comment_id, $meta_key, $meta_value, $prev_value);
}

function wp_set_comment_cookies($comment, $user) {
    if ( $user->exists() )
        return;

    $comment_cookie_lifetime = apply_filters('comment_cookie_lifetime', 30000000);
    setcookie('comment_author_' . COOKIEHASH, $comment->comment_author, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN);
    setcookie('comment_author_email_' . COOKIEHASH, $comment->comment_author_email, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN);
    setcookie('comment_author_url_' . COOKIEHASH, esc_url($comment->comment_author_url), time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN);
}

function sanitize_comment_cookies() {
    if ( isset($_COOKIE['comment_author_'.COOKIEHASH]) ) {
        $comment_author = apply_filters('pre_comment_author_name', $_COOKIE['comment_author_'.COOKIEHASH]);
        $comment_author = stripslashes($comment_author);
        $comment_author = esc_attr($comment_author);
        $_COOKIE['comment_author_'.COOKIEHASH] = $comment_author;
    }

    if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) ) {
        $comment_author_email = apply_filters('pre_comment_author_email', $_COOKIE['comment_author_email_'.COOKIEHASH]);
        $comment_author_email = stripslashes($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]) ) {
        $comment_author_url = apply_filters('pre_comment_author_url', $_COOKIE['comment_author_url_'.COOKIEHASH]);
        $comment_author_url = stripslashes($comment_author_url);
        $_COOKIE['comment_author_url_'.COOKIEHASH] = $comment_author_url;
    }
}

function wp_allow_comment($commentdata) {
    global $wpdb;
    extract($commentdata, EXTR_SKIP);

    // Simple duplicate check
    // expected_slashed ($comment_post_ID, $comment_author, $comment_author_email, $comment_content)
    $dupe = "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = '$comment_post_ID' AND comment_parent = '$comment_parent' AND comment_approved != 'trash' AND ( comment_author = '$comment_author' ";
    if ( $comment_author_email )
        $dupe .= "OR comment_author_email = '$comment_author_email' ";
    $dupe .= ") AND comment_content = '$comment_content' LIMIT 1";
    if ( $wpdb->get_var($dupe) ) {
        do_action( 'comment_duplicate_trigger', $commentdata );
        if ( defined('DOING_AJAX') )
            die( __('Duplicate comment detected; it looks as though you&#8217;ve already said that!') );

        wp_die( __('Duplicate comment detected; it looks as though you&#8217;ve already said that!') );
    }

    do_action( 'check_comment_flood', $comment_author_IP, $comment_author_email, $comment_date_gmt );

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

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

    $approved = apply_filters( 'pre_comment_approved', $approved, $commentdata );
    return $approved;
}

function check_comment_flood_db( $ip, $email, $date ) {
    global $wpdb;
    if ( current_user_can( 'manage_options' ) )
        return; // don't throttle admins
    $hour_ago = gmdate( 'Y-m-d H:i:s', time() - HOUR_IN_SECONDS );
    if ( $lasttime = $wpdb->get_var( $wpdb->prepare( "SELECT `comment_date_gmt` FROM `$wpdb->comments` WHERE `comment_date_gmt` >= %s AND ( `comment_author_IP` = %s OR `comment_author_email` = %s ) ORDER BY `comment_date_gmt` DESC LIMIT 1", $hour_ago, $ip, $email ) ) ) {
        $time_lastcomment = mysql2date('U', $lasttime, false);
        $time_newcomment  = mysql2date('U', $date, false);
        $flood_die = apply_filters('comment_flood_filter', false, $time_lastcomment, $time_newcomment);
        if ( $flood_die ) {
            do_action('comment_flood_trigger', $time_lastcomment, $time_newcomment);

            if ( defined('DOING_AJAX') )
                die( __('You are posting comments too quickly. Slow down.') );

            wp_die( __('You are posting comments too quickly. Slow down.'), '', array('response' => 403) );
        }
    }
}

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;
}

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) )
        $comments = $wp_query->comments;

    if ( empty($comments) )
        return 0;

    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;
}

function get_page_of_comment( $comment_ID, $args = array() ) {
    global $wpdb;

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

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

    if ( '' === $args['per_page'] && get_option('page_comments') )
        $args['per_page'] = get_query_var('comments_per_page');
    if ( empty($args['per_page']) ) {
        $args['per_page'] = 0;
        $args['page'] = 0;
    }
    if ( $args['per_page'] < 1 )
        return 1;

    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 );

    $allowedtypes = array(
        'comment' => '',
        'pingback' => 'pingback',
        'trackback' => 'trackback',
    );

    $comtypewhere = ( 'all' != $args['type'] && isset($allowedtypes[$args['type']]) ) ? " AND comment_type = '" . $allowedtypes[$args['type']] . "'" : '';

    // Count comments older than this one
    $oldercoms = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_parent = 0 AND comment_approved = '1' AND comment_date_gmt < '%s'" . $comtypewhere, $comment->comment_post_ID, $comment->comment_date_gmt ) );

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

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

function wp_blacklist_check($author, $email, $url, $comment, $user_ip, $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
    $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, $user_ip)
            || preg_match($pattern, $user_agent)
         )
            return true;
    }
    return false;
}

function wp_count_comments( $post_id = 0 ) {
    global $wpdb;

    $post_id = (int) $post_id;

    $stats = apply_filters('wp_count_comments', array(), $post_id);
    if ( !empty($stats) )
        return $stats;

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

    if ( false !== $count )
        return $count;

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

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

    $total = 0;
    $approved = array('0' => 'moderated', '1' => 'approved', 'spam' => 'spam', 'trash' => 'trash', 'post-trashed' => 'post-trashed');
    foreach ( (array) $count as $row ) {
        // Don't count post-trashed toward totals
        if ( 'post-trashed' != $row['comment_approved'] && 'trash' != $row['comment_approved'] )
            $total += $row['num_comments'];
        if ( isset( $approved[$row['comment_approved']] ) )
            $stats[$approved[$row['comment_approved']]] = $row['num_comments'];
    }

    $stats['total_comments'] = $total;
    foreach ( $approved as $key ) {
        if ( empty($stats[$key]) )
            $stats[$key] = 0;
    }

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

    return $stats;
}

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_id), array( 'trash', 'spam' ) ) )
        return wp_trash_comment($comment_id);

    do_action('delete_comment', $comment_id);

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

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

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

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

    clean_comment_cache($comment_id);

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

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;

    do_action('trash_comment', $comment_id);

    if ( wp_set_comment_status($comment_id, 'trash') ) {
        add_comment_meta($comment_id, '_wp_trash_meta_status', $comment->comment_approved);
        add_comment_meta($comment_id, '_wp_trash_meta_time', time() );
        do_action('trashed_comment', $comment_id);
        return true;
    }

    return false;
}

function wp_untrash_comment($comment_id) {
    if ( ! (int)$comment_id )
        return false;

    do_action('untrash_comment', $comment_id);

    $status = (string) get_comment_meta($comment_id, '_wp_trash_meta_status', true);
    if ( empty($status) )
        $status = '0';

    if ( wp_set_comment_status($comment_id, $status) ) {
        delete_comment_meta($comment_id, '_wp_trash_meta_time');
        delete_comment_meta($comment_id, '_wp_trash_meta_status');
        do_action('untrashed_comment', $comment_id);
        return true;
    }

    return false;
}

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

    do_action('spam_comment', $comment_id);

    if ( wp_set_comment_status($comment_id, 'spam') ) {
        add_comment_meta($comment_id, '_wp_trash_meta_status', $comment->comment_approved);
        do_action('spammed_comment', $comment_id);
        return true;
    }

    return false;
}

function wp_unspam_comment($comment_id) {
    if ( ! (int)$comment_id )
        return false;

    do_action('unspam_comment', $comment_id);

    $status = (string) get_comment_meta($comment_id, '_wp_trash_meta_status', true);
    if ( empty($status) )
        $status = '0';

    if ( wp_set_comment_status($comment_id, $status) ) {
        delete_comment_meta($comment_id, '_wp_trash_meta_status');
        do_action('unspammed_comment', $comment_id);
        return true;
    }

    return false;
}

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;
}

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 ) {
        do_action('transition_comment_status', $new_status, $old_status, $comment);
        do_action("comment_{$old_status}_to_{$new_status}", $comment);
    }
    do_action("comment_{$new_status}_{$comment->comment_type}", $comment->comment_ID, $comment);
}

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];

    return apply_filters('wp_get_current_commenter', compact('comment_author', 'comment_author_email', 'comment_author_url'));
}

function wp_insert_comment($commentdata) {
    global $wpdb;
    extract(stripslashes_deep($commentdata), EXTR_SKIP);

    if ( ! isset($comment_author_IP) )
        $comment_author_IP = '';
    if ( ! isset($comment_date) )
        $comment_date = current_time('mysql');
    if ( ! isset($comment_date_gmt) )
        $comment_date_gmt = get_gmt_from_date($comment_date);
    if ( ! isset($comment_parent) )
        $comment_parent = 0;
    if ( ! isset($comment_approved) )
        $comment_approved = 1;
    if ( ! isset($comment_karma) )
        $comment_karma = 0;
    if ( ! isset($user_id) )
        $user_id = 0;
    if ( ! isset($comment_type) )
        $comment_type = '';

    $data = 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');
    $wpdb->insert($wpdb->comments, $data);

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

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

    $comment = get_comment($id);
    do_action('wp_insert_comment', $id, $comment);

    if ( function_exists( 'wp_cache_incr' ) ) {
        wp_cache_incr( 'last_changed', 1, 'comment' );
    } else {
        $last_changed = wp_cache_get( 'last_changed', 'comment' );
        wp_cache_set( 'last_changed', $last_changed + 1, 'comment' );
    }

    return $id;
}

function wp_filter_comment($commentdata) {
    if ( isset($commentdata['user_ID']) )
        $commentdata['user_id'] = apply_filters('pre_user_id', $commentdata['user_ID']);
    elseif ( isset($commentdata['user_id']) )
        $commentdata['user_id'] = apply_filters('pre_user_id', $commentdata['user_id']);
    $commentdata['comment_agent']        = apply_filters('pre_comment_user_agent', ( isset( $commentdata['comment_agent'] ) ? $commentdata['comment_agent'] : '' ) );
    $commentdata['comment_author']       = apply_filters('pre_comment_author_name', $commentdata['comment_author']);
    $commentdata['comment_content']      = apply_filters('pre_comment_content', $commentdata['comment_content']);
    $commentdata['comment_author_IP']    = apply_filters('pre_comment_user_ip', $commentdata['comment_author_IP']);
    $commentdata['comment_author_url']   = apply_filters('pre_comment_author_url', $commentdata['comment_author_url']);
    $commentdata['comment_author_email'] = apply_filters('pre_comment_author_email', $commentdata['comment_author_email']);
    $commentdata['filtered'] = true;
    return $commentdata;
}

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;
}

function wp_new_comment( $commentdata ) {
    $commentdata = apply_filters('preprocess_comment', $commentdata);

    $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID'];
    if ( isset($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;

    $commentdata['comment_author_IP'] = preg_replace( '/[^0-9a-fA-F:., ]/', '',$_SERVER['REMOTE_ADDR'] );
    $commentdata['comment_agent']     = substr($_SERVER['HTTP_USER_AGENT'], 0, 254);

    $commentdata['comment_date']     = current_time('mysql');
    $commentdata['comment_date_gmt'] = current_time('mysql', 1);

    $commentdata = wp_filter_comment($commentdata);

    $commentdata['comment_approved'] = wp_allow_comment($commentdata);

    $comment_ID = wp_insert_comment($commentdata);

    do_action('comment_post', $comment_ID, $commentdata['comment_approved']);

    if ( 'spam' !== $commentdata['comment_approved'] ) { // If it's spam save it silently for later crunching
        if ( '0' == $commentdata['comment_approved'] )
            wp_notify_moderator($comment_ID);

        $post = get_post($commentdata['comment_post_ID']); // Don't notify if it's your own comment

        if ( get_option('comments_notify') && $commentdata['comment_approved'] && ( ! isset( $commentdata['user_id'] ) || $post->post_author != $commentdata['user_id'] ) )
            wp_notify_postauthor($comment_ID, isset( $commentdata['comment_type'] ) ? $commentdata['comment_type'] : '' );
    }

    return $comment_ID;
}

function wp_set_comment_status($comment_id, $comment_status, $wp_error = false) {
    global $wpdb;

    $status = '0';
    switch ( $comment_status ) {
        case 'hold':
        case '0':
            $status = '0';
            break;
        case 'approve':
        case '1':
            $status = '1';
            if ( get_option('comments_notify') ) {
                $comment = get_comment($comment_id);
                wp_notify_postauthor($comment_id, $comment->comment_type);
            }
            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_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_id);

    $comment = get_comment($comment_id);

    do_action('wp_set_comment_status', $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;
}

function wp_update_comment($commentarr) {
    global $wpdb;

    // First, get all of the original fields
    $comment = get_comment($commentarr['comment_ID'], ARRAY_A);

    // Escape data pulled from DB.
    $comment = esc_sql($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.
    extract(stripslashes_deep($commentarr), EXTR_SKIP);

    $comment_content = apply_filters('comment_save_pre', $comment_content);

    $comment_date_gmt = get_gmt_from_date($comment_date);

    if ( !isset($comment_approved) )
        $comment_approved = 1;
    else if ( 'hold' == $comment_approved )
        $comment_approved = 0;
    else if ( 'approve' == $comment_approved )
        $comment_approved = 1;

    $data = compact( 'comment_content', 'comment_author', 'comment_author_email', 'comment_approved', 'comment_karma', 'comment_author_url', 'comment_date', 'comment_date_gmt', 'comment_parent' );
    $rval = $wpdb->update( $wpdb->comments, $data, compact( 'comment_ID' ) );

    clean_comment_cache($comment_ID);
    wp_update_comment_count($comment_post_ID);
    do_action('edit_comment', $comment_ID);
    $comment = get_comment($comment_ID);
    wp_transition_comment_status($comment->comment_approved, $old_status, $comment);
    return $rval;
}

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;
}

function wp_update_comment_count($post_id, $do_deferred=false) {
    static $_deferred = array();

    if ( $do_deferred ) {
        $_deferred = array_unique($_deferred);
        foreach ( $_deferred as $i => $_post_id ) {
            wp_update_comment_count_now($_post_id);
            unset( $_deferred[$i] ); 
        }
    }

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

}

function wp_update_comment_count_now($post_id) {
    global $wpdb;
    $post_id = (int) $post_id;
    if ( !$post_id )
        return false;
    if ( !$post = get_post($post_id) )
        return false;

    $old = (int) $post->comment_count;
    $new = (int) $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id) );
    $wpdb->update( $wpdb->posts, array('comment_count' => $new), array('ID' => $post_id) );

    clean_post_cache( $post );

    do_action('wp_update_comment_count', $post_id, $new, $old);
    do_action('edit_post', $post_id, $post);

    return true;
}

//
// Ping and trackback functions.
//

function discover_pingback_server_uri( $url, $deprecated = '' ) {
    if ( !empty( $deprecated ) )
        _deprecated_argument( __FUNCTION__, '2.7' );

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

    $parsed_url = parse_url($url);

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

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

    $response = wp_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 its not a binary file)
    $response = wp_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;
}

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();
}

function do_trackbacks($post_id) {
    global $wpdb;

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

    if ( empty($post->post_excerpt) )
        $excerpt = apply_filters('the_content', $post->post_content);
    else
        $excerpt = apply_filters('the_excerpt', $post->post_excerpt);
    $excerpt = str_replace(']]>', ']]&gt;', $excerpt);
    $excerpt = wp_html_excerpt($excerpt, 252) . '...';

    $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) );
            }
        }
    }
}

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;
}

function pingback($content, $post_ID) {
    global $wp_version;
    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();

    $pung = get_pung($post_ID);

    // Variables
    $ltrs = '\w';
    $gunk = '/#~:.?+=&%@!\-';
    $punc = '.:?\-';
    $any = $ltrs . $gunk . $punc;

    // Step 1
    // Parsing the post, external links (if any) are stored in the $post_links array
    // This regexp comes straight from phpfreaks.com
    // http://www.phpfreaks.com/quickcode/Extract_All_URLs_on_a_Page/15.php
    preg_match_all("{\b http : [$any] +? (?= [$punc] * [^$any] | $)}x", $content, $post_links_temp);

    // 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[0] 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;

    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_ID);

            // 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;
            $client->useragent = apply_filters( 'pingback_useragent', $client->useragent . ' -- WordPress/' . $wp_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_ID, $pagelinkedto );
        }
    }
}

function privacy_ping_filter($sites) {
    if ( '0' != get_option('blog_public') )
        return $sites;
    else
        return '';
}

function trackback($trackback_url, $title, $excerpt, $ID) {
    global $wpdb;

    if ( empty($trackback_url) )
        return;

    $options = array();
    $options['timeout'] = 4;
    $options['body'] = array(
        'title' => $title,
        'url' => get_permalink($ID),
        'blog_name' => get_option('blogname'),
        'excerpt' => $excerpt
    );

    $response = wp_remote_post($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) );
}

function weblog_ping($server = '', $path = '') {
    global $wp_version;
    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;
    $client->useragent .= ' -- WordPress/'.$wp_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);
}

function pingback_ping_source_uri( $source_uri ) {
    $uri = esc_url_raw( $source_uri, array( 'http', 'https' ) );
    if ( ! $uri )
        return '';

    $parsed_url = @parse_url( $uri );
    if ( ! $parsed_url )
        return '';

    if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
        return '';

    if ( false !== strpos( $parsed_url['host'], ':' ) )
        return '';

    $parsed_home = @parse_url( get_option( 'home' ) );

    $same_host = strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] );

    if ( ! $same_host ) {
        $host = trim( $parsed_url['host'], '.' );
        if ( preg_match( '#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#', $host ) ) {
            $ip = $host;
        } else {
            $ip = gethostbyname( $host );
            if ( $ip === $host ) // Error condition for gethostbyname()
                $ip = false;
        }
        if ( $ip ) {
            if ( '127.0.0.1' === $ip )
                return '';
            $parts = array_map( 'intval', explode( '.', $ip ) );
            if ( 10 === $parts[0] )
                return '';
            if ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
                return '';
            if ( 192 === $parts[0] && 168 === $parts[1] )
                return '';
        }
    }

    if ( empty( $parsed_url['port'] ) )
        return $uri;

    $port = $parsed_url['port'];
    if ( 80 === $port || 443 === $port || 8080 === $port )
        return $uri;

    if ( $parsed_home && $same_host && $parsed_home['port'] === $port )
        return $uri;

    return '';
}

function xmlrpc_pingback_error( $ixr_error ) {
    if ( $ixr_error->code === 48 )
        return $ixr_error;
    return new IXR_Error( 0, '' );
}

//
// Cache
//

function clean_comment_cache($ids) {
    foreach ( (array) $ids as $id )
        wp_cache_delete($id, 'comment');

    if ( function_exists( 'wp_cache_incr' ) ) {
        wp_cache_incr( 'last_changed', 1, 'comment' );
    } else {
        $last_changed = wp_cache_get( 'last_changed', 'comment' );
        wp_cache_set( 'last_changed', $last_changed + 1, 'comment' );
    }
}

function update_comment_cache($comments) {
    foreach ( (array) $comments as $comment )
        wp_cache_add($comment->comment_ID, $comment, 'comment');
}

//
// Internal
//

function _close_comments_for_old_posts( $posts, $query ) {
    if ( empty( $posts ) || ! $query->is_singular() || ! get_option( 'close_comments_for_old_posts' ) )
        return $posts;

    $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;
}

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);

    $post_types = apply_filters( 'close_comments_for_post_types', array( 'post' ) );
    if ( ! in_array( $post->post_type, $post_types ) )
        return $open;

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

    return $open;
}