session_on_close function?

Hello, I would like to use something like a session_on_close function with a php function as argument, so that this php function gets called when a session is closed or destroyed. Such a function is very usefull for keeping certain statistics and in the old days we used it a lot in asp. As far as i know, this does not exist yet in php. I've searched the mailinglists and some websites but i could not find anything about it. Is there any possibility that such a function can be added to php? Any idea what is needed to get this into php? I've completeley no experience with the development op php. I only use it as a normal user: i write php scripts. Do you think this is to difficult to implement myself? Thanks in advance, Dries Verachtert -- ---- Dries Verachtert, Skotty@IRC, dries@ulyssis.org "You're one of those condescending Unix computer users!" "Here's a nickel, kid. Get yourself a better computer" - Dilbert.