CI Facebook API library

Easy to use, almost single-file Facebook API library for popular CodeIgniter PHP framework. It's very easy to authenticate users with their Facebook account. It takes seconds to integrate it with working CI application.

Usage

Edit config file with your defaults. Used config file is prepared to be used on several different enviroments depending on what You have inside ENV enviroment variable, default is 'dev'.

• Load it as any other lib $this->load->library('facebook');
• Place login button on site, You can pass this to your template: 'facebook_login_url' => $this->facebook->get_login_url() This will generate a link based on Your config settings.
• Facebbok::getAPI is used as a factory to spawn an object which will be used as a proxy to communicate with Facebook API after successful authentication of a user.
• Handle errors in try-catch block
• Use instantiated FacebookAPI object to call methods, /me for example

Example authentication controller

<?php defined('BASEPATH') OR exit('No direct script access allowed');

class FacebookLogin extends CI_Controller
{
    public function index()
	{
		$this->load->library('facebook');
		
		$code = $this->input->get('code');
		if (!empty($code)) {
			try {
				$profile = $this->facebook->getAPI($code)->call('/me');
				if (empty($profile)) {
					// handle empty profile error
				} else {
					$this->load->model('user');
					$user = $this->user->get_or_create($profile['email']);
					$user['facebook_username'] = $profile['username'];
					$user['first_name'] = $profile['first_name'];
					$user['last_name'] = $profile['last_name'];
					$this->user->save($user)->login($user);
					redirect('/user_area');
				}
			} catch(Exceptiion $e) {
				// handle error
                // $e->getMessage() will return invalid response from Facebook
			}
		} else if ($error_reason = $this->input->get('error_reason')) {
            // string error message from Facebook
		}
		
		redirect('/');
	}
}