FB API Cookie标头错误

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我有如下代码：

require '../lib/facebook-php-sdk/src/facebook.php'; $facebook = new Facebook(array( 'appId' => '143944345745133', 'secret' => 'xxxxxxxx', 'cookie' => true, )); $user = $facebook->getUser(); if ($user) { try { $user_profile = $facebook->api('/me'); } catch (FacebookApiException $e) { $user = 0; } } if ($user) { setcookie('loggedUserId', $user, time()+36000); setcookie('loggedUserName', $user_profile['name'], time()+36000); } else { setcookie('loggedUserId', '', time()-3600); setcookie('loggedUserName', '', time()-3600); }

我在我的php错误日志文件中得到错误：

and I get the error in my php error log file:

[17-Dec-2012 06:11:34 UTC] There exists a cookie that we wanted to clear that we couldn't clear because headers was already sent. Make sure to do the first API call before outputing anything.

请帮助我修复它。结果用户体验是，我登录后，页面需要重新加载到实际登录。感谢

Please help me fix it. The result user experience is that after I log in, the page needs to be reloaded to actually log in. Thanks

推荐答案

p>代码中的东西在调用setcookie之前会输出一些东西。它可以是调试消息。或者甚至在打开<？php标记之前的空行。

Something in your code is outputting something before the call to setcookie. It could be a debug message. Or even an empty line before opening <?php tag.