hi guys i’m new to css-tricks forum. I have a problem in php its some what advanced. I want my session to be accessible by all my sub domain. That is if a user login to http://www.example.com then the user should also be logged in sub.example.com . I used session_set_cookie_params(time() + 3600, ‘/’,’.domain.com’,false,false) it works fine in http://www.example.com and example.com but not in m.example.com . Can anyone help of out?