PHP Sessions across sub domains

Question

I am trying to set up the following:

auth.example.com
sub1.example.com
sub2.example.com

If the user visits sub1.example.com or

Answer 1

I had a similar problem, however, this solution was good for me, perhaps will help others in the future

edit the php.ini

session.cookie_domain = ".example.com"

the magic is here

suhosin.session.cryptdocroot = Off

suhosin.cookie.cryptdocroot = Off

https://www.sitepoint.com/community/t/sessions-across-subdomains-domain-com-phpsessid-changes/3013/19