Cleanup on session expire

[Anon]

How do I get notified when a session expires? I would like a piece of code that is executed when a session expires so that cleanup can be performed.

Something like the HttpSessionBindingListener in the Java Servlet specification. Surely the capable PHP can do something like this.

Thanks.

[Anon]

I want to perform an event like deleting a file from the server when the session expires. How do i do this? I require a Sample code for the above..