How can I judge a sessionid is being used or not?

From: Date: Sat, 07 Apr 2001 00:49:34 +0000
Subject: How can I judge a sessionid is being used or not?
Groups: php.windows 
Request: Send a blank email to php-windows+get-6558@lists.php.net to get a copy of this message
I mean that I have a onlineuser table,which contains two columns, sessionid and username. When the user is online,I insert his sessionid(created by php) and username into the sessionid table,and I want to delete the record when the user is offline,That's: How can I judge a sessionid is being used or not? or:How can I judge a user is online or not by his sessionid?

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