facebook

<!--controller  -->

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Welcome extends CI_Controller {

	public function __construct(){
		parent::__construct();
		// To use site_url and redirect on this controller.
        $this->load->helper('url');
	}

	public function login(){
		$this->load->library('facebook'); // Automatically picks appId and secret from config
        $user = $this->facebook->getUser();

        if ($user) {
            try {
                $data['user_profile'] = $this->facebook->api('/me');
            } catch (FacebookApiException $e) {
                $user = null;
            }
        }else {
            $this->facebook->destroySession();
        }
        if ($user) {
			$data['logout_url'] = site_url('welcome/logout'); // Logs off application
         } else {
            $data['login_url'] = $this->facebook->getLoginUrl(array(
                'redirect_uri' => site_url('welcome/login'),
                'scope' => array("email") // permissions here
            ));
        }
        $this->load->view('login',$data);

	}

    public function logout(){
		$this->load->library('facebook');
		$this->facebook->destroySession();
        redirect('welcome/login');
    }

}





<!--view--->
		<?php if (@$user_profile):  // call var_dump($user_profile) to view all data ?>

		<img src="https://graph.facebook.com/<?=$user_profile['id']?>/picture?type=large" style="width: 140px; height: 140px;">

		<h2><?=$user_profile['name']?></h2>

                <!--emailnya gak ke tarik om--->
		<h2><?=$user_profile['email']?></h2>


		<!-- Create link logout -->
		<a href="<?= $logout_url ?>">Logout</a>
		<?php else: ?>
		<h2>Login with Facebook Using CodeIgniter</h2>
		<a href="<?= $login_url ?>">Login</a>
		<?php endif; ?>