使用的系统信息:
[root@localhost ~]# uname -aLinux localhost.localdomain 3.15.4-x86_64-linode45 #1 SMP Mon Jul 7 08:42:36 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux[root@localhost ~]# php -vPHP 5.4.16 (cli) (built: Aug 6 2014 13:12:28)Copyright (c) 1997-2013 The PHP GroupZend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies[root@localhost ~]# httpd -vServer version: Apache/2.4.6 (CentOS)Server built: Jul 23 2014 14:48:00[root@localhost ~]#
ab测试 phpinfo() 结果:吞吐量 759!
D:\wamp\bin\apache\apache2.4.9\bin>ab -n 100 -c 10 http://linode.zbphp.com/This is ApacheBench, Version 2.3 Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking linode.zbphp.com (be patient).....doneServer Software: Apache/2.4.6Server Hostname: linode.zbphp.comServer Port: 80Document Path: /Document Length: 52627 bytesConcurrency Level: 10Time taken for tests: 7.592 secondsComplete requests: 100Failed requests: 14 (Connect: 0, Receive: 0, Length: 14, Exceptions: 0)Total transferred: 5280981 bytesHTML transferred: 5262681 bytesRequests per second: 13.17 [#/sec] (mean)Time per request: 759.206 [ms] (mean)Time per request: 75.921 [ms] (mean, across all concurrent requests)Transfer rate: 679.29 [Kbytes/sec] receivedConnection Times (ms) min mean[+/-sd] median maxConnect: 60 73 4.7 70 80Processing: 208 635 101.4 660 690Waiting: 70 237 120.5 220 640Total: 279 708 101.5 740 770Percentage of the requests served within a certain time (ms) 50% 740 66% 740 75% 740 80% 745 90% 750 95% 760 98% 760 99% 770 100% 770 (longest request)D:\wamp\bin\apache\apache2.4.9\bin>

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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