Not Sure If Session Is Initiated Using Facebook PHP SDK

Question

I'm trying to use Facebook's PHP SDK. The code that makes a call to Facebook to retrieve user's information is saved in a file called fbcall.php. The fbcall.php page is called through an href link from another page called index.php

The Entire Code (index.php):

<?php
echo "<a href=\"fbcall.php\">Login Here</a>";
?>

Index.php is also my FacebookRedirectLoginHelper redirect url.

The question I have is that I'm not seeing an output for the following statement in the fbcall.php file and I'm not sure why?

echo "Name: " . $user_profile->getName();

I get the sense that my sessions isn't initiated but I'm sure how to validate this. And if it isn't initiated then I'm not sure what i'm doing wrong considering I'm following Facebook's guidelines here (or atleast I think I am).

The Entire Code (fbcall.php):

<?php
session_start();
// Make sure to load the Facebook SDK for PHP via composer or manually

require_once 'autoload.php';

//require 'functions.php';  
use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookRequest;
use Facebook\FacebookResponse;
use Facebook\FacebookSDKException;
use Facebook\FacebookRequestException;
use Facebook\FacebookAuthorizationException;
use Facebook\GraphObject;
use Facebook\Entities\AccessToken;
use Facebook\HttpClients\FacebookCurlHttpClient;
use Facebook\HttpClients\FacebookHttpable;


// add other classes you plan to use, e.g.:
// use Facebook\FacebookRequest;
// use Facebook\GraphUser;
// use Facebook\FacebookRequestException;
FacebookSession::setDefaultApplication('AM USING MY APP ID HERE','AM USING MY SECRET KEY HERE');


$helper = new FacebookRedirectLoginHelper('http://localhost/facebook/index.php');
$params = array('email','public_profile', 'user_status', 'user_friends');
$loginUrl = $helper->getLoginUrl($params);

try {
  $session = $helper->getSessionFromRedirect();
  // var_dump($session);
} catch(FacebookRequestException $ex) {
} catch(\Exception $ex) {
}
if (isset($session)) {
  var_dump($session);
}
else
{
  $loginUrl = $helper->getLoginUrl();
  header("location:".$loginUrl);
  exit;
}


$request = new FacebookRequest($session, 'GET', '/me');
$response = $request->execute();
$graphObject = $response->getGraphObject();

if(isset($session)) {
  try {
    $user_profile = (new FacebookRequest(
      $session, 'GET', '/me'
    ))->execute()->getGraphObject(GraphUser::className());
    echo "Name: " . $user_profile->getName();
  } catch(FacebookRequestException $e) {
    echo "Exception occured, code: " . $e->getCode();
    echo " with message: " . $e->getMessage();
  }   
}
?>

Answer 1

Once the user grant your permissions, he/she will be redirected to index.php (because of your redirect_uri).

So there is two solutions:
- change you're redirect_uri to be fbcall.php
- move all fbcall.php logic to index.php, and change header("location:".$loginUrl); by echo "<a href=\"$loginUrl\">Login Here</a>";