PHP session time out on browser open -

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i know there many threads regarding php sessions while ajax queries etc... problem is,

i have ajax grid (build after page load), allow edit when use logged on. don't mind session not checked until user change page (then valid_session.php called), have issue, when next day user opens browser on same page - grid still editable! if refresh page, user logged out.

i have no-cache set on pages, browsers (in particular chrome) don't reload on open.

i can't head around how force refresh on reopen. please guide me right direction...

edit

btw - found way handle this. call session_destroy(); in session_destroy.php on unload() via $.get():

$(window).unload(function() {     $.get('session_destroy.php', function(data) {       alert(data); // alerts me of var set 0 - meaning session destroyed.     }); });

one solution set "last refreshed" cookie, , have javascript setinterval() checks if cookie older than, 20 minutes. if is, javascript triggers refresh. of course, still need log them out after inactivity period.


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