public static function createGUID() {
        if (function_exists('com_create_guid')) {
            return substr(com_create_guid(),1,36);
        }
        else {
            mt_srand((double) microtime() * 10000);
            $charid = strtoupper(md5(uniqid(rand(), true)));
            $hyphen = chr(45);
            $uuid = substr($charid, 0, 8) . $hyphen .
                    substr($charid, 8, 4) . $hyphen .
                    substr($charid, 12, 4) . $hyphen .
                    substr($charid, 16, 4) . $hyphen .
                    substr($charid, 20, 12);

            return $uuid;
        }
    }