user can't login using CodeIgniter with facebook php sdk - codeigniter

Question

I am following the guide here to play around with the facebook php sdk, but my little app doesn't work. It keeps staying on the login page.
Here is the controller:
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class Facebook_connect extends CI_Controller
{
function __construct()
{
parent::__construct();
$this->load->helper(array('form','url'));
$this->load->library('fb_connect');
}
function index()
{
}
function test()
{
$data['title'] = 'Facebook API Testing';
$data['user_id'] = $this->fb_connect->user_id;
if($data['user_id'])
{
$data['user_profile'] = $this->fb_connect->user;
}
if($data['user_id'])
{
$data['logout_url'] = $this->fb_connect->getLogoutUrl();;
}
else
{
$data['login_url'] = $this->fb_connect->getLoginUrl();
}
$this->template->load('template', 'facebook_connect/test', $data);
}
}
?>
Here is the view:
<h1>php-sdk</h1>
<?php if($user_id): ?>
Logout
<?php else: ?>
<div>
Login using OAuth 2.0 handled by the PHP SDK:
Login with Facebook
</div>
<?php endif ?>
<h3>PHP Session</h3>
<pre><?php print_r($_SESSION); ?></pre>
<?php if($user_id): ?>
<h3>Your Avata</h3>
<img src="https://graph.facebook.com/<?php echo $user_id; ?>/picture">
<h3>Your User Object (/me)</h3>
<pre><?php print_r($user_profile); ?></pre>
<?php else: ?>
<strong><em>You are not Connected.</em></strong>
<?php endif ?>
I get stuck at it and couldn't figure out why.

Answer 1

Use this example provided by facebook:
https://github.com/facebook/php-sdk/blob/master/examples/example.php
But keep your $this->load->library('fb_connect'); and make sure to add $this->fb_connect to any facebook library calls in that example.
It works 100%. Try to just put all the code in the controller to make sure it works, then distribute as needed. Not sure what your problem is, perhaps faulty return url.