Facebook connect using graph api

An example of using facebook graph api to authenticate users:

Setup a new application in facebook apps and get the app id and secret.

Now follow the steps:

Remember to give the same url in the below code, as that of the app settings.

<?php

if( !isset($_GET['code'])) { ?>

<a href="https://graph.facebook.com/oauth/authorize?client_id=xxxxxxxx&redirect_uri=http://xxxxxxxxxxxxxxxx/">Connect using Facebook</a>
<?php }

$code = trim($_GET['code']);
if(isset($_GET['code']))

$token = file_get_contents("https://graph.facebook.com/oauth/access_token?client_id=xxxxxxxx&redirect_uri=http://xxxxxxxxxxxxxxx&client_secret=xxxxxxxxxxxx&code=$code");
$token = explode("=", $token);
if(isset($_GET['code']))

$user = json_decode(file_get_contents('https://graph.facebook.com/me?access_token='.$token[1]));  print_r($user);

?>