$ facebook-> getUser（）总是返回0

问题描述：

可能重复：

为什么Facebook PHP SDK getUser总是返回0？

如果没有登录或需要许可，我使用以下代码来验证Facebook使用并将其重定向到登录页面。问题是getUser（）总是返回0，导致代码卡在重定向循环中。任何想法？

Am using the following code to authenticate Facebook uses and redirecting them to login page if not logged in or require permission. Problem is getUser() always returns 0 causing the code to get stuck in a redirecting loop. Any ideas?

include_once("facebook.php");

$app_id = 'xxxxxxxxxxxx';
$app_secret = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxx';

// initialize facebook
$facebook = new Facebook(array(
'appId' => $app_id,
'secret' => $app_secret,
));

$user = $facebook->getUser();
echo $user;
if ($user) {
 try {
    $fbme = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    error_log($e);
    $user = null;
  }
}
else
{
$loginUrl = $facebook->getLoginUrl(array('scope' => 'email'));
header('Location: '.$loginUrl);
}

答

我只是在使用Facebook API时不添加代码键值。系统需要它才能验证

After days of searching I found that I just wasn't adding a 'code' key value when using the Facebook API. The system needs it in order to validate

当您使用API函数$ facebook-> getLoginUrl（）;它会带您进入登录页面（当您正确验证时）只需在导航栏中使用code =x参数返回到您自己的网站。所以当实例化Facebook对象时，您只需使用获取请求来获取这些信息。

When you use the API function $facebook->getLoginUrl(); it takes you to a login-page that (when you authenticate properly) simply returns you to your own website with a code="x" parameter in the navigation bar. So when instantiating the Facebook Object you simply use a get request to nab this piece of information.

当您的页面重新加载Facebook API时，请确保其关键值之一是
'code'=> $ _GET ['code']，
sorted ..

when your page reloads the Facebook API, make sure that one of its key values is 'code' => $_GET['code'], sorted..

真的很生气，我不得不把自己弄清楚在这里查看getLoginUrl（）文档。 http：//developers.facebook。 com / docs / reference / php / facebook-getLoginUrl / ，你会发现它没有指定它返回什么，只是它授权应用程序，无论这意味着什么。

Really angry that I had to figure this out myself.. Look at the getLoginUrl() docs here http://developers.facebook.com/docs/reference/php/facebook-getLoginUrl/ and you'll find that nowhere does it specify what it returns, just that it "authorises" the app, whatever the hell that means.

同样在这里找到的PHP API文档的主页上 http://developers.facebook.com/docs/reference/php/ ，它指出所需的最少参数是应用程序秘密和appID。如果是这样，那么为什么添加代码来排序我的问题？

Also on the main page of the PHP API docs found here http://developers.facebook.com/docs/reference/php/, it states that the minimum number of parameters required are an app secret and an appID. If this is the case, then why does adding the code sort my problem?

如果我说废话，请回复。我想知道我的方式的错误：）。

If I'm talking nonsense, please respond. I like to know the error of my ways :).

$ facebook-> getUser（）总是返回0

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