A Simple library for the new Facebook SDK.

Facebook.php

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

if ( session_status() == PHP_SESSION_NONE ) {
	session_start();
}

// Autoload the required files
require_once( APPPATH . 'libraries/vendor/autoload.php' );
 
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookSession;
use Facebook\FacebookRequest;
use Facebook\Entities\AccessToken;

class Facebook
{
	protected $ci;
	private $helper;
	private $session;
	private $token;
	private $param;

	public function __construct($param = [])
	{
	        $this->ci =& get_instance();
	        $this->param = $param;
	        
	      	$appID = $param['app_id'];
	      	$appSecret = $param['app_secret'];
	
	        // Initialize the SDK
	    	FacebookSession::setDefaultApplication($appID, $appSecret);
	    	$this->helper = new FacebookRedirectLoginHelper($param['redirect_url']);
	
	    	$this->getSession();
	}

	/**
	 * getLoginURL
	 * @param array $scope permissions
	 * @return string
	 */
	public function getLoginUrl($scope = [])
	{
		return $this->helper->getLoginUrl($scope);
	}

	/**
	 * getLongLivedSession 
	 * Returns a new Facebook\FacebookSession resulting 
	 * from extending a short-lived access token.
	 * @return FacebookSession
	 */
	public function getLongLivedSession()
	{

		$accessToken = ($this->session) ? $this->session->getLongLivedSession() : FALSE;

		if($accessToken)
		{
			$_longLivedAccessToken = $accessToken->getAccessToken()->extend();
			$longLivedAccessToken = new AccessToken($_longLivedAccessToken);

			$code = AccessToken::getCodeFromAccessToken($_longLivedAccessToken);
			$newLongLivedAccessToken = AccessToken::getAccessTokenFromCode($code)->extend();

		}

		return (isset($newLongLivedAccessToken)) ? $newLongLivedAccessToken : FALSE;
	}

	/**
	 * getUser 
	 * Returns user's info
	 * @return array
	 */
	public function getUser($me = '/me')
	{
		$request = null;

		if($this->session)
		{
			$request = $this->api('GET', $me);
		}	

		return $request;
	}

	/**
	 * api 
	 * Returns a new request using the given session.
	 * @param FacebookSession $session
	 * @param string $method
	 * @param string $path
	 * @param array|null $parameters
	 * @return Facebook Request Object
	 */
	public function api($method, $path, $parameters = null)
	{
		$this->getSession();
		$request = (new FacebookRequest($this->session, $method, $path, $parameters))->execute();
		return $request->getGraphObject()->asArray();
	}

	/**
	 * getSession 
	 * Create the Facebook's Session
	 * @return void
	 */
	private function getSession()
	{
		try {
			$this->session = $this->helper->getSessionFromRedirect();
		} catch (FacebookRequestException $ex) {
			log_message('error', '[FACEBOOK] '.$ex->getRawResponse());
		} catch (Exception $ex) {
			log_message('error', '[FACEBOOK] '.$ex->getMessage());
		}

		if ( $this->session ) 
		{
			$token = ($this->session) ? $this->session->getToken() : null;
			$this->session = new FacebookSession( $token );
		} 
	}

}

/* End of file Facebook.php */
/* Location: ./application/libraries/facebook/Facebook.php */

hi Diego, have You tried this with the JavaScriptHelper ?