check-declined-granted-permission.php

<?php
session_start();
require_once __DIR__ . '/src/Facebook/autoload.php'; // download official fb sdk for php @ https://github.com/facebook/php-graph-sdk

$fb = new Facebook\Facebook([
  'app_id' => 'APP_ID',
  'app_secret' => 'APP_SECRET',
  'default_graph_version' => 'v2.12',
  ]);

$helper = $fb->getRedirectLoginHelper();

$permissions = ['publish_actions'];

try {
	if (isset($_SESSION['facebook_access_token'])) {
		$accessToken = $_SESSION['facebook_access_token'];
	} else {
  		$accessToken = $helper->getAccessToken();
	}
} catch(Facebook\Exceptions\FacebookResponseException $e) {
 	// When Graph returns an error
 	echo 'Graph returned an error: ' . $e->getMessage();
  	exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
 	// When validation fails or other local issues
	echo 'Facebook SDK returned an error: ' . $e->getMessage();
  	exit;
 }

if (isset($accessToken)) {
	if (isset($_SESSION['facebook_access_token'])) {
		$fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
	} else {
		// getting short-lived access token
		$_SESSION['facebook_access_token'] = (string) $accessToken;

	  	// OAuth 2.0 client handler
		$oAuth2Client = $fb->getOAuth2Client();

		// Exchanges a short-lived access token for a long-lived one
		$longLivedAccessToken = $oAuth2Client->getLongLivedAccessToken($_SESSION['facebook_access_token']);

		$_SESSION['facebook_access_token'] = (string) $longLivedAccessToken;

		// setting default access token to be used in script
		$fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
	}

	// redirect the user back to the same page if it has "code" GET variable
	if (isset($_GET['code'])) {
		header('Location: ./');
	}

	// getting declined and granted permissions
	$permissions = $fb->get('/me/permissions');
	$permissions = $permissions->getGraphEdge()->asArray();

	// printing declined and granted permission
	echo "<pre>";
	print_r($permissions);
	echo "</pre>";

	// making new login URL with declined permissions attached to it
	foreach ($permissions as $key) {
		if ($key['status'] == 'declined') {
			$declined[] = $key['permission'];
			$loginUrl = $helper->getReRequestUrl('http://sohaibilyas.com/APP_DIR/', $declined);
			echo '<a href="' . $loginUrl . '">Log in with Facebook!</a>';
		}
	}

  	// Now you can redirect to another page and use the access token from $_SESSION['facebook_access_token']

} else {
	// replace your website URL same as added in the developers.facebook.com/apps e.g. if you used http instead of https and you used non-www version or www version of your website then you must add the same here
	$loginUrl = $helper->getLoginUrl('http://sohaibilyas.com/APP_DIR/', $permissions);
	echo '<a href="' . $loginUrl . '">Log in with Facebook!</a>';
}