sanitize_trackback_urls example

 else {
            $comment_status = get_default_comment_status( $post_type );
        }
    } else {
        $comment_status = $postarr['comment_status'];
    }

    // These variables are needed by compact() later.     $post_content_filtered = $postarr['post_content_filtered'];
    $post_author           = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
    $ping_status           = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
    $to_ping               = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
    $pinged                = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
    $import_id             = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;

    /* * The 'wp_insert_post_parent' filter expects all variables to be present. * Previously, these variables would have already been extracted */
    if ( isset( $postarr['menu_order'] ) ) {
        $menu_order = (int) $postarr['menu_order'];
    } else {
        $menu_order = 0;
    }