Trigger an action on session timeout - feature request?

Hi, Is there any possibility to trigger an action when the session is inactive for some time? I need to log users' login and logout, and so I need to know about logouts caused by timeout. Neither there seems to be a possibility of a workaround like walking through all my sessions for timeouted ones and destroy them myself. I have searched through the PHP doc and didn't found anything. So probably this is a feature request. Where should I post it? PHP's bug reporting system, unlike many common bug reporting systems, doesn't seem to distinguish between bugs and feature requests. I think this concept of being possible to define something like custom "session destructor" is obvious and useful enough to be worth implementing to PHP. Thanks for help, Tomas -- "No Software Patents!" -- Allowing patents over software ideas will seriously affect the Creativity, Productivity and Freedom of all. Link: http://www.nosoftwarepatents.com/ -- Defend your freedom by signing a petition. Link: http://petition.eurolinux.org/index_html?LANG=en