Save Session Variables to Database on Session Expire

I am wondering if it is po开发者_如何学Gossible to rescue session data into a database or a file when the session expires. For example when I have a object living in my session, will the destructor be called when the session expires?

Basically the question is about how PHP handle sessions when they expire.

Thanks for your help!

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It looks like you can use the session_set_save_handler function to define a callback that gets called whenever the session is destroyed.

As a side note, I would question whether or not it's good design to be saving data when the session times out, rather than just saving it during the session.

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To change the max lifetime for a session try this:

ini_set("session.gc_maxlifetime", "18000");

This will set the lifetime to 5 hours. You have to use this in every script that you want to change the default lifetime for.

To get the lifetime of a session:

echo ini_get("session.gc_maxlifetime");