Question

How do I check if the user is really loggedin? $facebook->getUser() still returns an ID after logout. Do I need to do something like $facebook->api('/me') just to check if the user is “really” logged in?

Answer 1

Well, FB PHP SDK in my opinion is quite tricky because it relies on a cookie sent from Facebook when you are logging into the Facebook. This cookie is not deleted whilst logging out. Because of that in below code the variable $uid could store a proper user facebook id:

$uid = $facebook->getUser();

So, as far as I know, call $facebook->api('/me'); will tell the truth whether the user is logged in or not.

try {
   $facebook->api('/me');
   /* user is really logged into FB */
} catch (Exception $e) {
   /* user is not currently logged into the FB */
}

I use above code in my production application and it works well.