Facebook PHP SDK在第一页加载时失败 - Facebook PHP SDK fails on first page load

Facebook PHP SDK fails on first page load

第一次加载index.php时，调用时得到值0

$facebook->getUser();//returning 0 instead of id on first page load

该调用在随后的任何页面加载中都能正常工作。

这是我的代码：

$facebook = new Facebook(array(
        'appId'  => $FB_APP_ID, 
        'secret' => $FB_APP_SECRET
    ));
$user_id = $facebook->getUser();//Returns 0 on first load.

其他人经历过这种情况吗？如果$facebook->getUser();没有返回有效用户，也许我应该自动重新加载页面？

可能不是第一次对其进行身份验证，您可以这样做：

<?php
    $facebook = new Facebook(array(
        'appId'  => xxx, 
        'secret' => xxx
    ));
    $user_id = $facebook->getUser();
    if($user_id) {
      // We have a user ID, so probably a logged in user.
      // If not, we'll get an exception, which we handle below.
      try {
        $me = $facebook->api('/me','GET');
        echo "Name: " . $me['name'];
      } catch(FacebookApiException $e) {
        // If the user is logged out, you can have a 
        // user ID even though the access token is invalid.
        // In this case, we'll get an exception, so we'll redirect and
        // just ask the user to login again here.
        $login_url = $facebook->getLoginUrl(); 
        echo("<script>top.location.href = '" . $loginUrl . "';</script>");
      }   
    } else {
      // No user, redirect for the user to login
      $login_url = $facebook->getLoginUrl();
      echo("<script>top.location.href = '" . $loginUrl . "';</script>");
    }
  ?>

编辑：

如果错误仍然存在，请尝试此编辑，只需更改您的此行：

$me = $facebook->api('/me','GET');

到此：

$me= $facebook->api('/'.$user_id, 'GET');

希望这能解决你的问题。