/**
  * @see	\wcf\system\session\ACPSessionFactory::readSessionID()
  */
 protected function readSessionID()
 {
     $sessionID = parent::readSessionID();
     // get sessionID from cookie
     if (empty($sessionID) && isset($_COOKIE[COOKIE_PREFIX . 'cookieHash'])) {
         $sessionID = $_COOKIE[COOKIE_PREFIX . 'cookieHash'];
     }
     return $sessionID;
 }