Facebook PHP Example Logout Code

logout.php

<?php
require '../src/facebook.php';

// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
  'appId'  => '<appid>',
  'secret' => '<appsecret>',
));

$user = $facebook->getUser();

//Check if user exists
if($user)
{
	$params = array( 'next' => 'logout.php' );
	$logoutUrl = $facebook->getLogoutUrl();
}
else
{
	session_destroy();
	header("Location: example.php");
	die();
}