如果你正在处理facebook app标签页，下面的代码可以帮助你找到isfan状态

If you are dealing with facebook app tab page, the following code helps you to find isfan status

$signed = parse_signed_request($_REQUEST['signed_request'], 'YOUR-APP-SECRET');
if ($signed['page']['liked'] == 1) {
    $fan = true;
} else {
    $fan = false;
}

访问此链接以获取演示和源代码代码.

Visit this link for demo and source code.