2 different php sessions: www.domain.com and domain.com: How to consolidate?

Question

So after spending several hours ripping my hair out I finally realized the issue with my sessions. The session data was being written but the server was "silently" starting 2 sessions.

1) Firs session for all pages that are in the www.domain.com

2) And another one for just domain.com

How can I consolidate the 2 sessions and be sure that regardless of "www" or not, I am pulling the same session?

Thank you! Appreciate all help.

Answer 1

Considering that www is practically a subdomain (to public readers: correct me if I am wrong), then maybe you can find useful information here:
Allow php sessions to carry over to subdomains