how to check session

From: Date: Tue, 12 Mar 2002 10:26:44 +0000
Subject: how to check session
Groups: php.general 
Request: Send a blank email to php-general+get-88169@lists.php.net to get a copy of this message
How can I check if a session is still valid or if it has been expired. I want to check that and if not valid then execute an other script. Can't be that difficult but after 2 hours in traffic jams my brain is not working anymore .

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