how to see all sessions sets in server

From: Date: Sun, 04 Aug 2013 09:02:55 +0000
Subject: how to see all sessions sets in server
Groups: php.general 
Request: Send a blank email to php-general+get-321782@lists.php.net to get a copy of this message
hi i want to write online user module for my site and i want to check $_SESSION['userID'] to find all users id who loged in but when i echo this code its return only current user detail how i can see all sessions? foreach($_SESSION as $k => $v) { echo $k."----------".$v; } or how i handle online users?

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