public static function checkCookies()
 {
     if (isset($_SESSION['id_user']) && (int) $_SESSION['id_user'] > 0) {
         ModelUser::setCurrentUser($_SESSION['id_user']);
         return true;
     }
     if (!isset($_COOKIE['user_token'])) {
         return false;
     }
     try {
         $user = ModelUser::loginWithToken($_COOKIE['user_token']);
         $_SESSION['id_user'] = $user->getId();
     } catch (LoginException $ex) {
         return false;
     }
     return true;
 }