i haven't looked into it properly yet, but is there a way in PHP of recording the length of time a visitor stays on your website i can record the entry, but i don't know how to record the exit time
There's really no way to do this, only ways to estimate the time.
Assign each user a unique id (session_id or a username) and record the time during each request. After there are no more requests for X minutes (your choice), then consider the session terminated.
If you are using session, one possibility may be to use your own handler and write a garbage collection routine that records the "age" of the session file as it's cleaned up. You can consider the age of the session file as the time that the user was on your site.
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