public static function get_comment_text($comment_content, $comment)
 {
     /**
      * has parent
      */
     if ($comment->comment_parent != 0) {
         $parent_comment = theme_cache::get_comment($comment->comment_parent);
         $parent_author = theme_cache::get_comment_author($parent_comment->comment_ID);
         $comment_content = '<a href="' . theme_cache::get_permalink($parent_comment->comment_post_ID) . '#comment-' . $parent_comment->comment_ID . '" class="at" rel="nofollow">@' . $parent_author . '</a> ' . $comment_content;
     }
     return $comment_content;
 }