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Editorial Team
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Asked: 2026-06-09T22:42:50+00:00

I coded a facebook app in PHP with php-facebook sdk, that is working absolutely

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I coded a facebook app in PHP with php-facebook sdk, that is working absolutely fine on my windows 7, wamp.

But, now i implemented it on the webspace running on linux, and i’m getting a session_start() cookie error.

Warning: session_start() [function.session-start]: Cannot send session cookie - 
headers already sent by (output started at /mydirectory/index.php:5) in 
/mydirectory/src/facebook.php on line 37

I’m not getting why I’m encountering this error.

Below is my code

<!DOCTYPE html PUBLIC  
"-//W3C//DTD XHTML 1.0 Transitional//EN"  
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<?php
    require_once('src/facebook.php');
    $app_id = "MY_APP_ID";
    $app_secret = "MY_APP_SECRET";

    $config = array(
    'appId' => $app_id,
    'secret' => $app_secret,
    'fileUpload' => true,  
    'cookie' => true
    );
    $facebook = new Facebook($config);
    $user_id = $facebook->getUser();

 // other content

 ?>
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1 Answer

  1. Editorial Team

    You cannot print HTML before sending headers, the proper way to do it will be

    Example:

    <?php
session_start();
//
require 'src/facebook.php';
$facebook = new Facebook(array(
  'appId'  => '135669679827333',
  'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxx',
  'cookie' => true, // enable optional cookie support
  ));
  try { $user = $facebook->getUser(); } catch (FacebookApiException $e) {  }
?>
<!DOCTYPE html>
<html>
<head><title></title>
<meta />
</head>
<body>
<content here>
</body>
</html>
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