The function $helper->getSessionFromRedirect() consistently comes back empty

It seems that I'm facing an issue where `getsessionformredirect` always returns null. The log output shows "session = " returning null. Despite looking through various threads and trying out different Facebook login example files, I haven't been able to find a solution. However, I do get logged in successfully. When I clear my cache and login via my site before going to Facebook, I find myself already logged into the platform.

Here's the code snippet:

<?php
// PHP code goes here
?>

If you need to see auto-load information:

<?php
// More PHP code for autoloading
?>
phpfacebookfacebook-graph-apifacebook-php-sdkhelper

Answer №1

It appears that there was an error in the URL the page was redirecting to, but now everything is functioning correctly. The next step is to investigate why the link isn't working in Internet Explorer.

Answer №2

<?php
session_start();
// added in version 4.0.0
require_once 'autoload.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;
// initialize app with app id and secret
FacebookSession::setDefaultApplication( '****','****' );
// login helper with redirect URI
    $helper = new FacebookRedirectLoginHelper('myurl/login_form.php' );
try {
  $session = $helper->getSessionFromRedirect();
} catch( FacebookRequestException $ex ) {
  // Handle errors when Facebook returns an error
} catch( Exception $ex ) {
  // Handle validation failures or other local issues
}
error_log("session = $session \n", 3 , "C:/wamp/logs/php_error.log");
// check if we have a session
if ( isset( $session ) ) {
  // graph API request for user data
  $request = new FacebookRequest( $session, 'GET', '/me' );
  $response = $request->execute();
  // obtain response
  $graphObject = $response->getGraphObject();
     $fbid = $graphObject->getProperty('id');              // Retrieve Facebook ID
     $fbfullname = $graphObject->getProperty('name'); // Get full name from Facebook
    $femail = $graphObject->getProperty('email');    // Retrieve Facebook email ID
/* ---- Session Variables -----*/
    $_SESSION['FBID'] = $fbid;           
        $_SESSION['FULLNAME'] = $fbfullname;
    $_SESSION['EMAIL'] =  $femail;
echo( $_SESSION['FBID']);
    /* ---- Redirect after session ----*/
  header("Location: login_form.php");
} else {
  $loginUrl = $helper->getLoginUrl();
 header("Location: ".$loginUrl);
}
?>

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