> What you'll need to do is add *two* timestamps to each user -- one for
> when they first accessed the system, and one when they last requested
a
> page. Your "15 minute check" should then use the difference between
> these values to determine whether the user has been inactive for 15
> minutes.
My apologies -- this will give you their total session time. To work
out if they've been inactive for more than 15 minutes you'll have to do
a time check comparing the "last active" timestamp and the current time
using now().
Tim.
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