facebook-> getUser（）總是返回0

我正在使用PHP SDK，我現在只是測試它，它看起來像getUser返回0後登錄。閱讀通過文檔，似乎無法找到任何東西。以下是我登錄後用戶重定向到的頁面。facebook-> getUser（）總是返回0

<?php 

require_once("facebook.php"); 
$facebook = new Facebook(array('appId' => ???, 
          'secret' => '???')); 
$uid = $facebook->getUser; 
    if($uid){ 
    try{ 
     $user_profile = $facebook->api('/me','GET'); 
     $params = (array('next' => 'http://fbtest.net23.net/')); 
     $logouturl = $facebook->getLogoutUrl($params); 
     $message = "<p>You ARE loged in with Facebook :)</p>\n"; 
     $a = "<a href=\"{$logouturl}\">Logout</a>\n"; 
     $content = $message . "<br/>\n" . $a; 
} 
catch (FacebookApiException $e){ 
    error_log($e); 
    $content = "<p>Dont work!</p>\n"; 
} 
} 
else{ 
     $params = (array('scope' => 'read_stream, friends_likes')); 
     $loginurl = $facebook->getLoginUrl($params); 
     $message = "<p>You are NOT loged in with Facebook :(</p>\n"; 
     $a = "<a href=\"{$loginurl}\">Login with FB</a>\n"; 
     $content = $message . "<br/>" . $a; 
} 

?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html lang="en"> 
<head> 
<title>test</title> 
</head> 
<body> 

    <?php echo $content;?> 

</body> 
</html>

問題出在用戶登錄後，他們得到else語句的結果。任何幫助或建議將不勝感激:)。

來源

2012-04-04 James Roberts