Allow php sessions to carry over to subdomains

Question

I use php sessions (not cookies, except for session id cookie) for all user data, and when a user goes to their profile user.mydomain.com they are immediately \"logged out\"

Answer 1

I know this is quite old - but to further expand on @CTT's suggestion - I needed to add a php.ini file in each sub-directory (that will be executing php code and requires the session) of my subdomain with the following text:

suhosin.session.cryptdocroot=Off
suhosin.cookie.cryptdocroot=Off

I hope this helps (it took me ages to figure this out).