when someone logs in, it sets $HTTP_SESSION_VARS with the appropriate
information. to log them out, I tried just using
unset($HTTP_SESSION_VARS['valid_user']) but it doesn't actually remove
it from the session. it will only work if valid_user was set on the same
script call (for example, if it logs me in and then immediately logs me
out without making another call to the script). How come
$HTTP_SESSION_VARS won't destroy session variables unless they're
created during the same script call? Or maybe it just has to do with if
$HTTP_SESSION_VARS creates any variable before it deletes any. Thanks
for your help =)

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