


In fact, during the project process, we often encounter the path to obtain the address of the previous page. You can return to the previous page using
<script>window.history.go(- 1);</script>
This is operated through JS
If such a scenario occurs, when the user needs to log out of the account, you want him to log out directly. Return to the current page
For example, the address of the current page is http://xxx/module.php?module=groupbook&view=index&id=2.
You must use $_SERVER[' to exit the system REQUEST_URI'] to get the current path, and then pass this value as a parameter to the path that needs to be returned when exiting. At this time, you will find that
he only got http://xxx/module.php?module= groupbook did not get &view=index&id=2, which means that the return address after we exit became
http://xxx/module.php?module=groupbook (it should be http://xxx /module.php?module=groupbook&view=index&id=2),
This is because he regards & as the first parameter, which is simply understood as
http://xxx/login .php?op=logout&return=http://xxx/module.php?module=groupbook&view=index&id=2,
became
http://xxx/login.php? op=logout&return=http://xxx/module.php?module=groupbook&view=index&id=2.
At this time we need to transcode the currently obtained $_SERVER['REQUEST_URI'] and use urlencode($_SERVER['REQUEST_URI'])
to solve our problem

Thedifferencebetweenunset()andsession_destroy()isthatunset()clearsspecificsessionvariableswhilekeepingthesessionactive,whereassession_destroy()terminatestheentiresession.1)Useunset()toremovespecificsessionvariableswithoutaffectingthesession'soveralls

Stickysessionsensureuserrequestsareroutedtothesameserverforsessiondataconsistency.1)SessionIdentificationassignsuserstoserversusingcookiesorURLmodifications.2)ConsistentRoutingdirectssubsequentrequeststothesameserver.3)LoadBalancingdistributesnewuser

PHPoffersvarioussessionsavehandlers:1)Files:Default,simplebutmaybottleneckonhigh-trafficsites.2)Memcached:High-performance,idealforspeed-criticalapplications.3)Redis:SimilartoMemcached,withaddedpersistence.4)Databases:Offerscontrol,usefulforintegrati

Session in PHP is a mechanism for saving user data on the server side to maintain state between multiple requests. Specifically, 1) the session is started by the session_start() function, and data is stored and read through the $_SESSION super global array; 2) the session data is stored in the server's temporary files by default, but can be optimized through database or memory storage; 3) the session can be used to realize user login status tracking and shopping cart management functions; 4) Pay attention to the secure transmission and performance optimization of the session to ensure the security and efficiency of the application.

PHPsessionsstartwithsession_start(),whichgeneratesauniqueIDandcreatesaserverfile;theypersistacrossrequestsandcanbemanuallyendedwithsession_destroy().1)Sessionsbeginwhensession_start()iscalled,creatingauniqueIDandserverfile.2)Theycontinueasdataisloade

Absolute session timeout starts at the time of session creation, while an idle session timeout starts at the time of user's no operation. Absolute session timeout is suitable for scenarios where strict control of the session life cycle is required, such as financial applications; idle session timeout is suitable for applications that want users to keep their session active for a long time, such as social media.

The server session failure can be solved through the following steps: 1. Check the server configuration to ensure that the session is set correctly. 2. Verify client cookies, confirm that the browser supports it and send it correctly. 3. Check session storage services, such as Redis, to ensure that they are running normally. 4. Review the application code to ensure the correct session logic. Through these steps, conversation problems can be effectively diagnosed and repaired and user experience can be improved.

session_start()iscrucialinPHPformanagingusersessions.1)Itinitiatesanewsessionifnoneexists,2)resumesanexistingsession,and3)setsasessioncookieforcontinuityacrossrequests,enablingapplicationslikeuserauthenticationandpersonalizedcontent.


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