Passing Session Between 2 Subdomains?

[getDizzle]

I have two domains:

sub1.hostname.com
sub2.hostname.com

I have one script that redirects from sub2 to sub1 and then back to sub2. Basically, if someone is not logged in I send them to login, then it will send them back after they login. I have a lot of session data I want to retain, however. Simply using session_start() on each side does not seem to maintain the sessoin data.

Does anyone know a way around this?

[getDizzle]

Found the solution. I put:

php_value session.cookie_domain .hostname.com

in a .htaccess in the root folder of this application. So the session data will be shared with anything.hostname.com.

Hope this helps someone else.