I am receiving warning in Facebook Application using PHP SDK

Question

I used the following code to configure the facebook API and my structure what to follow is also OK. But I am receiving warning like that.

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /customers/2/1/f/mrprofessional.se/httpd.www/ziaullah/index.php:6) in /customers/2/1/f/mrprofessional.se/httpd.www/ziaullah/src/facebook.php on line 49 Login

you can see the error by clicking on that link

The Code is given

<html>
<head>
<title>PHP SDK</title>
</head>
<body>
<?php
require_once 'src/facebook.php';
$facebook = new Facebook(array(
  'appId'  => '198516340340394',
  'secret' => 'f11117b96e0996ecbf7d7f4919c0cf70',
  'cookie' => true
));
$user = $facebook->getUser();
$user_profile = null;
if ($user) {

try {
    $user_profile = $facebook->api('/me');
    $facebook->api('/me/feed/', 'post', array(
    'message' => 'I want to display this message on my wall'
));
  } catch (FacebookApiException $e) {
    error_log($e);
    $user = null;
  }

}

if ($user_profile) {
  $logoutUrl = $facebook->getLogoutUrl();
  echo '<a href="$logoutUrl">Logout</a>';
} else {
  $loginUrl = $facebook->getLoginUrl(array(
  'scope' => 'publish_stream, read_friendlists'

  ));
  echo '<a href="$logoutUrl">Login</a>';
}
?>

</body>
</html>

Please help me if possible I will be thankful

score 0 · Answer 1 · 2014-01-01T00:14:11.293

0

You need to ensure that any code that modifies the HTTP headers is executed before the headers are sent. This includes statements like session_start(). The headers will be sent automatically when any HTML is output.

Your problem here is that you're sending the HTML ouput at the top of your page before you've executed any PHP at all.

Move the session_start() to the top of your document :

<?php 
  session_start();
?>
<html>
<head>
<title>PHP SDK</title>
</head>
<body>
<?php
require_once 'src/facebook.php';  

// more PHP code here.

edited Jan 01 '14 at 00:14

answered Dec 31 '13 at 23:57

It is unnecessary to remove the session_start from `facebook.php` because the Facebook API does check whether the session_start has already started before it decides to start the session_start(). – invisal Dec 31 '13 at 23:59
@invisal Fair enough - I didn't know that. Answer edited accordingly. – Jan 01 '14 at 00:14

I am receiving warning in Facebook Application using PHP SDK

1 Answers1