I am starting an old app refactoring, I will rebuild some functionality from spaghetti code to MVC (Symfony). Plan was I will set up new IIS app, using subdomain. Now, old app is running PHP 5.3 which can't be upgraded. New app will be running on PHP 5.6. Only thing I need to carry is authentication. I can have login script either on old or new app. I tried setting session cookie params but I can't get it working.
Is it possible at all or do I have to use database? If it is not possible, can that be achieved in Apache?
Edit:
What I'm to do is:
session.cookie_domain = ".dev"
In both php.ini. Then I start the session in one, set a session variable.
session_start();
$_SESSION['test'] = 123;
Then in the second app (php 5.6) I'm trying to read it:
session_start();
var_dump($_SESSION);
But it's empty.