<?
session_start();

// FACEBOOK API

// include required files form Facebook SDK
require_once( 'includes/Facebook/HttpClients/FacebookHttpable.php' );
require_once( 'includes/Facebook/HttpClients/FacebookCurl.php' );
require_once( 'includes/Facebook/HttpClients/FacebookCurlHttpClient.php' );

require_once( 'includes/Facebook/Entities/AccessToken.php' );
require_once( 'includes/Facebook/Entities/SignedRequest.php' );

require_once( 'includes/Facebook/FacebookSession.php' );
require_once( 'includes/Facebook/FacebookRedirectLoginHelper.php' );
require_once( 'includes/Facebook/FacebookSignedRequestFromInputHelper.php' ); // added in v4.0.9
require_once( 'includes/Facebook/FacebookRequest.php' );
require_once( 'includes/Facebook/FacebookResponse.php' );
require_once( 'includes/Facebook/FacebookSDKException.php' );
require_once( 'includes/Facebook/FacebookRequestException.php' );
require_once( 'includes/Facebook/FacebookOtherException.php' );
require_once( 'includes/Facebook/FacebookAuthorizationException.php' );

// these two classes required for canvas and tab apps
require_once( 'includes/Facebook/FacebookCanvasLoginHelper.php' );
require_once( 'includes/Facebook/FacebookPageTabHelper.php' );

require_once( 'includes/Facebook/GraphObject.php' );
require_once( 'includes/Facebook/GraphSessionInfo.php' );

use Facebook\HttpClients\FacebookHttpable;
use Facebook\HttpClients\FacebookCurl;
use Facebook\HttpClients\FacebookCurlHttpClient;

use Facebook\Entities\AccessToken;
use Facebook\Entities\SignedRequest;

use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookSignedRequestFromInputHelper; // added in v4.0.9
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookOtherException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\GraphSessionInfo;

// these two classes required for canvas and tab apps
use Facebook\FacebookCanvasLoginHelper;
use Facebook\FacebookPageTabHelper;

$appid = '00000000000000';
$secret = '00000000000000000000000';

// init app with app id and secret
FacebookSession::setDefaultApplication($appid,$secret);

// init page tab helper
$pageHelper = new FacebookPageTabHelper();

// get session from the page
$pageSession                = $pageHelper->getSession();

$_SESSION['token']          = $pageSession->getToken();
$_SESSION['p_uid']          = $pageHelper->getUserId();
$_SESSION['p_pid']          = $pageHelper->getPageId();
$_SESSION['p_like']         = $pageHelper->isLiked();
$_SESSION['p_admin']        = $pageHelper->isAdmin();

$session = new FacebookSession($_SESSION['token']);
echo "Token: ".$_SESSION['token']."<br>";

echo "<pre>";
print_r($session);
echo "</pre>";

try{
    $session->validate($appid ,$secret);
}catch( FacebookAuthorizationException $ex){
    // Session is not valid any more, get a new one.
    echo $ex;
    $session ='';
}
?>