public static function me()
 {
     $user = self::session();
     if (is_null($user) && array_key_exists('login', $_POST) && array_key_exists('password', $_POST)) {
         $user = Kadmin::getByLoginPassword($_POST['login'], $_POST['password']);
     }
     if (is_a($user, 'Kadmin')) {
         $_SESSION['kadmin'] = serialize($user);
     }
     return $user;
 }