The life cycle of the session is how long _php Foundation

The life cycle of the session is 1 when the browser ends and its lifecycle ends at the same time, but the file still exists in/tmp/(Sess_???)
2 The next time you open the browser will redistribute SessionID, if you use session_id () to bring back the previous ID, you will read the remaining in/tmp Sess_???, get back all the parameters you've set before
3 can modify the duration of the session file in PHP.ini

Session.gc_maxlifetime = 1440; After this number of seconds, stored
; Data would be seen as \ ' garbage\ ' and
; Cleaned up by the GC process

The default is 1440 seconds, 24 minutes.