функция get_user_id arrowchat

Я пытаюсь установить Arrowchat на моем сайте, но не найти userid

оригинальная треска из Arrowchat это

/**
* This function returns the user ID of the logged in user on your site.  Technical support will not
* help you with this for stand-alone installations.  You must purchase the professional installation
* if you are having trouble.
*
* Suggestion: Check out the other integration files in the functions/integrations directory for
* many examples of how this can be done.  The easiest way is to get the user ID through a cookie.
*
* @return the user ID of the logged in user or NULL if not logged in
*/

function get_user_id()
{

$userid = NULL;

if (isset($_COOKIE['userid']))
{
$userid = $_COOKIE['userid'];
}

return $userid;

}

Это в config.php

define('DB_USERTABLE','users');
define('DB_USERTABLE_NAME','username');
define('DB_USERTABLE_USERID','idu');
define('DB_USERTABLE_AVATAR','image');

Мой ИД пользователя из MySQL idu