Question

If I have an app and it is run inside facebook. the first load I will get the

$_REQUEST['signed_request'] 

but if you click on any link inside my app and navigate within the app you will lose that $_REQUEST['signed_request'].

Is there any other way to know if my app is being run in a browser or inside facebook?

Answer 1

You can save value of signed_request in php session, something like this:

session_start();
if (isset($_REQUEST['signed_request'])){
  $_SESSION['signed_request'] = $_REQUEST['signed_request'];
}

Later you can check if signed_request value is saved in session:

if (isset($_SESSION['signed_request'])){
  //do something
}