getLogoutUrl is not working with facebook graphp api using php codeigniter - php

Question

My facebook php sdk getLogoutUrl is not working when i click on my logout url.
it takes me back to my given redirect url but it does not destroy my facebook session i can still see my var_dump($fb_data) array on my page and logout url.
Here is my code i am using codeigniter
My lib_login library function facebook code
public function facebook()
{
$facebook_default_scope = explode(',', $this->ci->config->item("facebook_default_scope"));
$facebook_app_id = $this->ci->config->item("facebook_app_id");
$facebook_api_secret = $this->ci->config->item("facebook_api_secret");
// init app with app id and secret
FacebookSession::setDefaultApplication($facebook_app_id, $facebook_api_secret);
// login helper with redirect_uri
$helper = new FacebookRedirectLoginHelper(site_url('login/facebook'));
// see if a existing session exists
if (isset($_SESSION) && isset($_SESSION['fb_token'])) {
// create new session from saved access_token
$session = new FacebookSession($_SESSION['fb_token']);
// validate the access_token to make sure it's still valid
try {
if (!$session->validate()) {
$session = null;
}
} catch (Exception $e) {
// catch any exceptions
$session = null;
}
}
if (!isset($session) || $session === null) {
// no session exists
try {
$session = $helper->getSessionFromRedirect();
} catch(FacebookRequestException $ex) {
// When Facebook returns an error
// handle this better in production code
print_r($ex);
} catch(Exception $ex) {
// When validation fails or other local issues
// handle this better in production code
print_r($ex);
}
}
// see if we have a session
if (isset($session)) {
// save the session
$_SESSION['fb_token'] = $session->getToken();
// create a session using saved token or the new one we generated at login
$session = new FacebookSession($session->getToken());
// graph api request for user data
$request = new FacebookRequest($session, 'GET', '/me?fields=id,name,accounts{access_token,category,name,id,perms},permissions');
$response = $request->execute();
// get response
$graphObject = $response->getGraphObject()->asArray();
$logoutUrl = site_url('login');
$fb_data = array(
'me' => $graphObject,
'loginUrl' => $helper->getLoginUrl($facebook_default_scope),
'logoutUrl' => $helper->getLogoutUrl($session,$logoutUrl),
);
$this->ci->session->set_userdata('fb_data', $fb_data);
} else {
$fb_data = array(
'me' => null,
'loginUrl' => $helper->getLoginUrl($facebook_default_scope),
'logoutUrl' => $helper->getLogoutUrl($session,$logoutUrl),
);
$this->ci->session->set_userdata('fb_data', $fb_data);
}
return $fb_data;
}
Here is my function of my controller
public function facebook()
{
$fb_data = $this->lib_login->facebook();
if (isset($fb_data['me'])) {
echo "<pre>";
var_dump($fb_data);
echo "</pre>";
echo 'logout';
} else {
echo 'Login';
}
}
When ever i login to my account using this code then the logout url and $fb_data array appears on my page but when i logout and refresh my page it is still their.Can some one tell what i am doing wrong here.

Answer 1

Try something like this:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Login extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->library(array('session', 'lib_login'));
$this->fb_data = $this->lib_login->facebook();
}
/**
* facebook login
*
* #return void
* #author appleboy
**/
public function facebook()
{
// check login data
if (isset($this->fb_data['me'])) {
var_dump($this->fb_data);
} else {
echo 'Login';
}
}
public function logout()
{
if ( isset($this->fb_data['me']) ) {
$this->session->unset_userdata('fb_data');
}
redirect('login/facebook', 'refresh');
}
}
/* End of file login.php */
/* Location: ./application/controllers/login.php */