Facebook SDK returned an error: Cross-site request forgery validation failed. The “state” param from the URL and session do not match

Question

i\'m trying to get Facebook user id using the php sdk like this

$fb = new Facebook\\Facebook([
    \'app_id\' => \'11111111111\',
    \'app_secret\' =>         


        

Answer 1

For me the problem was different; (I was stupid) I had a popup window with Facebook login and again Facebook login buttons in Login/Signup page.

• Whenever i click the Facebook button in the popup from other pages it worked fine.
• But, when i click the Facebook button in the popup from Login/Signup page, it would not work.

The reason was i had re-instantiated the Facebook and getRedirectLoginHelper objects. I had to comment out these statements in Login/Signup pages, as it was already available.

$_SESSION['FBRLH_state']=$_GET['state'];

is not the way to go. Although it worked.