Question

How to get session cookies working / to be accessible under domain and subdomains?

Answer 1

For session cookies you need to override the cookie params:

So you can either use:

ini_set('session.cookie_domain', '.website.com');

or

session_set_cookie_params(0, '/', '.website.com');

The ‘.’ in front makes it accessible under the domain and the subdomains.

Note: you will have to delete all existing cookies from your browser for the domain you’re working with so they can be re-initialized properly to work.