in file Session2.php, method HTTP_Session2::setGcMaxLifetime() If optional parameter is specified it determines the number of seconds after which session data will be seen as 'garbage' and cleaned up
setGcProbability
in file Session2.php, method HTTP_Session2::setGcProbability() If optional parameter is specified it determines the probability that the gc (garbage collection) routine is started and session data is cleaned up
in file Session2.php, method HTTP_Session2::useCookies() If optional parameter is specified it indicates whether the module will use cookies to store the session id on the client side in a cookie.