public static function getCurrentUser($security = 0)
 {
     if (!$security) {
         return;
     }
     $session_id = Core::validate($_COOKIE['PHPSESSID']);
     if ($session_id == null) {
         return null;
     }
     $clientIP = Core::getClientIP();
     $session = new Session();
     $session->findBySessionId(Core::calculateHash($session_id . $clientIP));
     $usr = new User();
     $usr->findById($session->getUserId());
     $login = $usr->getLogin();
     if (isset($login)) {
         return $usr;
     }
 }