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Please let me know how to keep a PHP session for a pre-defined time and then delete it.
$_SESSION['startTime'] = time(); // current time
// end the session in 50 mins
$_SESSION['expireTime'] = $_SESSION['start'] + (50 * 60);
Then check the current time with the $_SESSION['expireTime'] when you want to check for a user login validation or any other form of validation.