re[PHP] moving data from old users (session_set_save_handler ??)

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hi all,
I need to remove data when user leaves my webapplication. I fire an unload
event (that calls a php script) but sometimes fails, so I need a more secure
option.
I wonder if session_set_save_handler is what I need. I think so but not
sure.

So, EVEN if  the user leaves my webapplication, will his session be
destroyed (after reaching $maxlifetime) and, as consequence, the associated
functions will be executed (functions like deleting from database, user
folders...)?

In PHP documentation, it's said:"session.gc_maxlifetime specifies the number
of seconds after which data will be seen as 'garbage' and cleaned up.
Garbage collection occurs during session start. "

And..."session.gc_probability in conjunction with session.gc_divisor is used
to manage probability that the gc (garbage collection) routine is
started.Defaults to 1"   ----> does it mean that only 1% of the old sessions
(and associated actions) are deleted each time?

Some idea?

thanks alot, 
Pere
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