Question

I have a question. Let’s say I am on website domain1.com and I click on a link on domain1.com that brings me to domain2.com. But I want to use the same session_id() that was set with session_start() in domain1.com on domain2.com. How do I accomplish this in PHP?

Thank you.

Answer 1

As the session_id() itself doen’t contain any data, there are a couple of things to consider:

• If the session is set in a cookie, you can’t transfer it (unless to a subdomain), make sure you transfer it via GET
• In order to have the data associated with the SESSION sync accross the servers, you have to share the file system (e.g. via GlusterFS), at least for the path the SESSIONS are saved (e.g. /tmp/php)
• if you save objects in the SESSION make sure they are available on both servers

If both domains are pointing to the same document root on the same server you only need to take care about the first point

If you only want to use the session_id() and not the associated data, you can just set the id: session_id('yourSessionIdFromDomain1')