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POCannot send session cookie - headers already sent while requesting facebook API
 

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  1. POCannot send session cookie - headers already sent while requesting facebook API
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    <p>I am getting the following error in my application that asks the user to login using facebook account : Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at XXXXXXXXXXXXXXXXXXXXXXXXXXXXX/show.php:4) in XXXXXXXXXXXXXXXXXXXXXXXXXXXXX/lib/facebook.php on line 37</p> <p>Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at XXXXXXXXXXXXXXXXXXXXXXXXXXXXX/show.php:4) in XXXXXXXXXXXXXXXXXXXXXXXXXXXXX/lib/facebook.php on line 37</p> <p>I don't know why this error is shown in spite of the face that it does not appear when I was hosting my app on phpcloud.com</p> <p>Here is the code of the show.php</p> <pre><code>&lt;?php $id=$_GET['id']; include('lib/db.php'); require 'lib/facebook.php'; require 'lib/fbconfig.php'; // Connection... $user = $facebook-&gt;getUser(); if ($user) { $logoutUrl = $facebook-&gt;getLogoutUrl(); try { $userdata = $facebook-&gt;api('/me'); } catch (FacebookApiException $e) { error_log($e); $user = null; } $_SESSION['facebook']=$_SESSION; $_SESSION['userdata'] = $userdata; $_SESSION['logout'] = $logoutUrl; header("Location: home.php?id=$id"); } else { $loginUrl = $facebook-&gt;getLoginUrl(array( 'scope' =&gt; 'user_about_me,user_activities,user_birthday,user_checkins,user_education_history,user_events,user_groups,user_hometown,user_interests,user_likes,user_location,user_notes,user_online_presence,user_photo_video_tags,user_photos,user_relationships,user_relationship_details,user_religion_politics,user_status,user_videos,user_website,user_work_history,email,read_friendlists,read_insights,read_mailbox,read_requests,read_stream,xmpp_login,ads_management,create_event,manage_friendlists,manage_notifications,offline_access,publish_checkins,publish_stream,rsvp_event,sms,publish_actions,manage_pages' )); echo '&lt;div class="style1"&gt;&lt;a target="_top" href="'.$loginUrl.'"&gt;&lt;img src="facebook.png" title="Login with Facebook" /&gt;&lt;/a&gt;&lt;/div&gt;'; } ?&gt; </code></pre> <p>Here is the facebook.php code :</p> <pre><code> &lt;?php require_once "base_facebook.php"; class Facebook extends BaseFacebook { public function __construct($config) { if (!session_id()) { session_start(); } parent::__construct($config); } protected static $kSupportedKeys = array('state', 'code', 'access_token', 'user_id'); protected function setPersistentData($key, $value) { if (!in_array($key, self::$kSupportedKeys)) { self::errorLog('Unsupported key passed to setPersistentData.'); return; } $session_var_name = $this-&gt;constructSessionVariableName($key); $_SESSION[$session_var_name] = $value; } protected function getPersistentData($key, $default = false) { if (!in_array($key, self::$kSupportedKeys)) { self::errorLog('Unsupported key passed to getPersistentData.'); return $default; } $session_var_name = $this-&gt;constructSessionVariableName($key); return isset($_SESSION[$session_var_name]) ? $_SESSION[$session_var_name] : $default; } protected function clearPersistentData($key) { if (!in_array($key, self::$kSupportedKeys)) { self::errorLog('Unsupported key passed to clearPersistentData.'); return; } $session_var_name = $this-&gt;constructSessionVariableName($key); unset($_SESSION[$session_var_name]); } protected function clearAllPersistentData() { foreach (self::$kSupportedKeys as $key) { $this-&gt;clearPersistentData($key); } } protected function constructSessionVariableName($key) { return implode('_', array('fb', $this-&gt;getAppId(), $key)); } } ?&gt; </code></pre> <p>Now here is the fbconfig.php</p> <pre><code> &lt;?php //Facebook Application Configuration. $facebook_appid='XXXXXXXXXXXXXXXXXXX'; $facebook_app_secret='XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'; $facebook = new Facebook(array( 'appId' =&gt; $facebook_appid, 'secret' =&gt; $facebook_app_secret, )); ?&gt; </code></pre> <p>I have found a leading thread in this post (What is Output Buffering?) that states that outputbuffering is a solution to such problems. If so, where shall I add it ? in show.php or facebook.php and how to add it ?</p>
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    1. USNizar Bark
    1. USNizar Bark
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    1. COCan you post fbconfig.php as well?
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      1. POCannot send session cookie - headers already sent while requesting facebook API
      1. USNilesh
    2. COI have edited the question to add the fbconfig.php
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      1. POCannot send session cookie - headers already sent while requesting facebook API
      1. USNizar Bark
 

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