Facebook php-sdk链接墙贴不好

Question

首先请求许可：

if(!$data["user_id"]) {

  $app_id = "175403625997298";

    $redirect_url = urlencode("https://www.facebook.com/szalagavatoszeged/app_175403625997298?app_data=haho"); 
    $scope = "publish_stream";
    $auth_url = "https://www.facebook.com/dialog/oauth?client_id=" . $app_id . "&redirect_uri=" . $redirect_url . "&scope=" . $scope;
    echo("<script> top.location.href='" . $auth_url . "'</script>");
    $login_url=$facebook->getLoginUrl($scope);
    fb_publish();
}

检查我在链接中提供的参数后：

if($szavazott=='haho'){
    header('Location: szavazott.php');

}

并发布：

try {
    $ret_obj = $facebook->api('/me/feed', 'POST',
    array('link' => 'https://www.facebook.com/szalagavatoszeged/app_175403625997298','message' => 'Posting with the PHP SDK!',));

    print 'haha';

} catch(FacebookApiException $e) {

}   

但是这段代码没有张贴：S可能出错了什么？