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POIssues with sessions on Facebook PHP SDK
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  1. POIssues with sessions on Facebook PHP SDK
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    copied!<p>I want to make in my site buttons that <code>onclick</code> will post on user facebook wall a message. I call an AJAX script from php pages in my site that send the message in _POST to the php file with the facebook code.</p> <p>I'm getting this ERROR while running my php file:</p> <blockquote> <p>Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/user/public_html/fb/index.php:1) in /home/user/public_html/fb/facebook.php on line 49</p> </blockquote> <p>my PHP look like this:</p> <pre><code>&lt;?php include('../ilink.php'); //mysqli connection $fb_message=$_POST['fb_message']; $fb_description=$_POST['fb_description']; $fb_picture=$_POST['fb_picture']; require 'facebook.php'; // Create our Application instance. $facebook = new Facebook(array( 'appId' =&gt; '--appid--', 'secret' =&gt; '--secret--', 'cookie' =&gt; true )); $user = $facebook-&gt;getUser(); if ($user) { try { // Proceed knowing you have a logged in user who's authenticated. $user_profile = $facebook-&gt;api('/me'); } catch (FacebookApiException $e) { error_log($e); $user = null; } } // Login or logout url will be needed depending on current user state. if ($user) { $logoutUrl = $facebook-&gt;getLogoutUrl(); } else { $loginUrl = $facebook-&gt;getLoginUrl(); } $attachment = array('message' =&gt; $fb_message, 'name' =&gt; 'text', 'caption' =&gt; 'text', 'link' =&gt; 'http://www.domain.com', 'description' =&gt; $fb_description, 'picture' =&gt; $fb_picture, 'actions' =&gt; array(array('name'=&gt;'text', 'link' =&gt; 'http://www.domain.com'),) ); $result = $facebook-&gt;api('/me/feed/','post',$attachment); ?&gt; </code></pre> <p>my ajax script:</p> <pre><code> function fb_post(fb_message,fb_description,fb_picture,redirect){ var xmlhttp; if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else{// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function(){ if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200){ document.location.href =redirect;  } } var q="fb_message="+fb_message+"&amp;fb_description="+fb_description+"&amp;fb_picture="+fb_picture; xmlhttp.open("POST","/fb/index.php",true); xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xmlhttp.send(q); } </code></pre> <p>Why the ERROR appear?</p>
 

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