PHP: what is the purpose of session_name

I'm not quite sure what the purpose of session_names is.. Can someone please explain in what circumstances defining a name would be开发者_如何学编程 beneficial?

You have two sites on the same domain. (say, a blog and a forum)

They both run different pieces of software.

If they ran on the same session and used the same variables in $_SESSION, (say, user_id), they would conflict.

session_name lets you give each application a different session.

The default is - I think - PHPSESSID. If you have more than one application on the same host, they would share those sessions. So, you should set different session names for each application, so that there is no weird stuff happening.