note 109630 added to function.session-cache-expire

I'm a beginner PHP programming. When reviewing a source code, I saw something like this: session_start() ; session_cache_limiter("") ; session_cache_expire(30) ; In the code above, the session_cache_expire was called after the session_start(). I don't know what the web exactly doing? Please take a look. Thanks. ---- Server IP: 69.147.83.197 Probable Submitter: 14.161.5.128 ---- Manual Page -- http://www.php.net/manual/en/function.session-cache-expire.php Edit -- https://master.php.net/note/edit/109630 Del: integrated -- https://master.php.net/note/delete/109630/integrated Del: useless -- https://master.php.net/note/delete/109630/useless Del: bad code -- https://master.php.net/note/delete/109630/bad+code Del: spam -- https://master.php.net/note/delete/109630/spam Del: non-english -- https://master.php.net/note/delete/109630/non-english Del: in docs -- https://master.php.net/note/delete/109630/in+docs Del: other reasons-- https://master.php.net/note/delete/109630 Reject -- https://master.php.net/note/reject/109630 Search -- https://master.php.net/manage/user-notes.php