Using Facebook PHP SDK 3 with CodeIgniter

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Facebook App

  1. Create a new Facebook App.
  2. Get the APP ID and APP Secret.
  3. After creating your App, click Settings.
  4. In the Basic section, add your domain name in the App Domains.
  5. Click on Add Platform and select Website and add the same domain you added in step 4 but with http:// as prefix in Site URL.
  6. To test the app localhost, you need to create a Virtual Host.

Installing

  1. Download the Facebook PHP SDK.
  2. Download CodeIgniter.
  3. Extract CodeIgniter.
  4. Extract the Facebook SDK and
    1. Rename facebook.php to Facebook.php
    2. Add the following at the beginning of the Facebook.php file, right after the php opening tag.
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      if ( ! defined('BASEPATH')) exit('No direct script access allowed');
    3. Create a directory named “facebook” in application/libraries and copy the 3 files in the Facebook SDK extracted directory to application/libraries/facebook in CodeIgniter.
  5. In CodeIgniter, create a file facebook.php in application/config directory with the following content (add your application Id and secret key of the Facebook app):
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    <?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

    $config['appId'] = [App ID];
    $config['secret'] = [App secret];
    /* End of file facebook.php */
    /* Location: ./application/config/facebook.php */
  6. Open your application/config/config.php file and make sure $config[‘allow_get_array’] is set to true.

How this example will work with OAuth

In OAuth, the procedure is the following:

  1. The user clicks on a sign in link on your website.
  2. User is redirected to Facebook, enter his credentials, authorize your app.
  3. Facebook then redirects the user back to your application with data.

Creating controller and view files

1. Create a controller (in this example Auth Controller). In your controller add the following code:

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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Auth extends CI_Controller {
public function facebook()
{
parse_str( $_SERVER['QUERY_STRING'], $_REQUEST );
$CI = & get_instance();
$CI->config->load("facebook", TRUE);
$config = $CI->config->item('facebook');
$this->load->library('facebook/Facebook', $config);$userId = $this->facebook->getUser();// If user is not yet authenticated, the id will be zero
if($userId == 0){
// Generate a login url
$data[‘login_url’] = $this->facebook->getLoginUrl(array(‘scope’=>’email,user_about_me’));
$this->load->view(‘main_index’, $data);
} else {
// Get user’s data and print it
$user = $this->facebook->api(‘/me’);
echo ‘<pre>’;
print_r($user);
}

2. Create a view, called main_index.php in your views directory.

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<a href="<?php echo $login_url; ?>">Click here to login using Facebook</a>

3. Now load the function facebook of Auth Controller in your browser.

If the user authenticates your app, you will get the user’s data.

Author: Teji

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