Facebook的pages.isfan需要用户ID

问题描述

基本上我想知道我的访客是否已经是我的Facebook页面的粉丝.
我试了一会儿，到目前为止， pages.isFan 是最好的解决方案.
http://developers.facebook.com/docs/reference/rest/pages.isFan/

Basically I would like to know if my visitor is already a fan of my Facebook Page or not.
I tried looking a while and pages.isFan is the best solution so far.
http://developers.facebook.com/docs/reference/rest/pages.isFan/

但是 pages.isFan 需要用户ID( uid )，只有当他们安装或授予对我的Facebook应用的访问权限时，我才能获得该用户ID.

But pages.isFan need user id (uid), which I can only get if they installed or grant access to my Facebook apps.

我的问题是，有没有一种方法可以获取访问用户的 uid ，而不要求他们授予对我的Facebook应用程序的访问权限?

My question is, is there a way just to get the uid of my visiting user without ask them to grant access to my Facebook apps?

推荐答案

此代码应能解决问题:

$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);

if (empty($data["page"]["liked"])) {
  /* Not Fan */
}
else {
  /* Fan */
}

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