Facebook - 获取朋友列表在php

Question

我正在写一个应用程序，将打印所有的用户的朋友。

<?php 
$api_key = 'xxxxxxxxxx'; 
$secret = 'xxxxxxxxxxxxxxxxx'; 

include_once './facebook-php-sdk-master/src/facebook.php'; 

$facebook = new Facebook($api_key, $secret); 
$user = $facebook->getUser(); 

?> 
<h1>Facebook friends</h1> 
Hello <fb:name uid='<?php echo $user; ?>' useyou='false' possessive='true' />! <br> 
Your id : <?php echo $user; ?>. 

Friends List:<br> 
<? 
$friends = $facebook->api('/me/friends'); 

?> 

<ul> 
<? 
foreach($friends as $friend){ 
    echo "<li><fb:name uid=\"$friend\" useyou=\"false\"></li>"; 
} 
?> 
</ul> 

我得到这个结果为：

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/kurokmed/public_html/fb/index.php:2) in /home/kurokmed/public_html/fb/facebook-php-sdk-master/src/facebook.php on line 49 Facebook friends

您好！ 您的ID：0好友列表：

Fatal error: Uncaught OAuthException: Error validating application. Cannot get application info due to a system error. thrown in /home/kurokmed/public_html/fb/facebook-php-sdk-master/src/base_facebook.php on line 1254

请告诉我，我在做什么是发送/修改HTTP头必须在调用之前作出的任何输出到浏览器，否则你错了

Answer 1

功能”我会得到错误：

Warning: Cannot modify header information - headers already sent (output started at file:line) 

这个错误会告诉你哪个文件导致问题，并在哪一行。

您发布的第二个错误 - 请检查您的Facebook应用设置。

Answer 2

<?php 
$api_key = 'xxxxxxxxxx'; 
$secret = 'xxxxxxxxxxxxxxxxx'; 

include_once 'facebook-php-sdk-master/src/facebook.php'; 

$facebook = new Facebook($api_key, $secret); 
$user = $facebook->getUser(); 

    if ($user) { 
     $user_profile = $facebook->api('/me'); 
     $friends = $facebook->api('/me/friends'); 

     echo '<ul>'; 
     foreach ($friends["data"] as $value) { 
      echo '<li>'; 
      echo '<div class="pic">'; 
      echo '<img src="https://graph.facebook.com/' . $value["id"] . '/picture"/>'; 
      echo '</div>'; 
      echo '<div class="picName">'.$value["name"].'</div>'; 
      echo '</li>'; 
     } 
     echo '</ul>'; 
    } 
?>