session自动清理

http://php.net/manual/zh/session.configuration.php#ini.session.gc-maxlifetime

https://segmentfault.com/q/1010000004200007

session(array('name'=>'session_id','expire'=>3600));

https://blog.csdn.net/qq_40872870/article/details/79500404

https://blog.csdn.net/xiaoniu__/article/details/72650311

https://www.cnblogs.com/mrcln/p/5564656.html