如何驗證訪問令牌並獲取新的無效的？

Question

我的應用程序工作得很好，一切正常，但當用戶註銷或兩個小時後回來或更改密碼或刪除應用程序，然後嘗試再次添加它我得到這樣的錯誤與每個原因錯誤：

Fatal error: Uncaught OAuthException: Error validating access token: The session is invalid because the user logged out. thrown in /home/user/public_html/new_fb_app/src/base_facebook.php on line 1028 

此外，如果我嘗試刷新後出現此錯誤應用程序將工作得很好。所以我想這與該應用嘗試使用最後一個訪問令牌（這是無效的）有關。

這是我的代碼：

<?php 
$user = null; //facebook user uid 
try{ 
include_once "src/facebook.php"; 
} 
catch(Exception $o){ 
echo '<pre>'; 
print_r($o); 
echo '</pre>'; 
    } 
// Create our Application instance (replace this with your appId and secret). 
$facebook = new Facebook(array(
    'appId'  => 'my appId', 
    'secret'  => 'my app secret', 
    'fileUpload' => true 
)); 

// Get User ID 
$user  = $facebook->getUser(); 
$loginUrl = $facebook->getLoginUrl(
    array(
    'scope' => 'read_stream, publish_stream, photo_upload, user_photos' 
    ) 
); 

if ($user) { 
try { 
// Proceed knowing you have a logged in user who's authenticated. 
$access_token = $facebook->getAccessToken(); 
} catch (FacebookApiException $e) { 
//you should use error_log($e); instead of printing the info on browser 
d($e); // d is a debug function defined at the end of this file 
$user = null; 
} 
} 
if (!$user) { 
echo "<script type='text/javascript'>top.location.href = '$loginUrl';</script>"; 
exit; 
    } 
function d($d){ 
echo '<pre>'; 
print_r($d); 
echo '</pre>'; 
} 
?> 

Answer 1

清空cookie或會話當用戶註銷？