如何让用户使用他们的Facebook帐户登录我的网站？

Question

我使用SDK php让用户使用他们的Facebook帐户登录我的网站。我正在关注SDK示例。当我试图让登录的用户ID返回0：

$id = $facebook->getUser(); 

你能告诉我是什么问题，以及如何使用PHP SDK工作

的例子是这样的代码例如：

<?php 
$config = FacebookConfig::getConfig(); 
$facebook = new Facebook($config); 
$user = $facebook->getUser(); 
Facebook::$CURL_OPTS[ CURLOPT_SSL_VERIFYPEER ] = false; 

if ($user) { 
    try { 
     $user_profile = $facebook->api('/me'); 
     $logoutUrl = $facebook->getLogoutUrl(); 
    } 
    catch (FacebookApiException $e) { 
     error_log($e); 
     $user = null; 
    } 
} else { 
    try { 

     $loginUrl = $facebook->getLoginUrl(array(
      "scope" => "email,user_education_history,user_work_history", 
      "redirect_uri" => "http://localhost:8888/www/index.php" 
     )); 
     $user = $facebook->getUser(); 
     $user_profile = $facebook->api('/me'); 
     $userProf = $facebook->api("/$user"); 
     echo $user; 
     echo $user_profile; 
    } 
    catch (FacebookApiException $e) { 
     $user = null; 
     echo "expetion in login"; 

    } 
} 
?> 

Answer 1

您必须将用户重定向到$loginUrl！试试这个：

<?php 
$config = FacebookConfig::getConfig(); 
$facebook = new Facebook($config); 
$user = $facebook->getUser(); 
Facebook::$CURL_OPTS[ CURLOPT_SSL_VERIFYPEER ] = false; 

if ($user) { 
    try { 
     $user_profile = $facebook->api('/me'); 
     var_dump($user_profile); 
     $logoutUrl = $facebook->getLogoutUrl(); 
    } 
    catch (FacebookApiException $e) { 
     error_log($e); 
     $user = null; 
    } 
} else { 
    try { 
     $loginUrl = $facebook->getLoginUrl(array(
      "scope" => "email,user_education_history,user_work_history", 
      "redirect_uri" => "http://localhost/facebook/index.php" 
     )); 
     header('Location: '.$loginUrl); 
    } 
    catch (FacebookApiException $e) { 
     $user = null; 
     echo "exception in login"; 
    } 
}