php fb - state & code

$login=$facebook->getLoginUrl(array(
            'redirect_uri' => 'stranka.sk',
            'req_perms' => 'email,user_about_me',
            'scope' => 'email,user_about_me'));

$request = $facebook->getSignedRequest();

$userId = $facebook->getUser();
    $me = null;
    if($userId) {
        try {
            $me = $facebook->api('/me');
        }catch(FacebookApiException $e) {
            error_log($e->getType());
            error_log($e->getMessage());
        }
    else {
      //presmerovanie zase na fb login..
    }