作者:limodou
这里向大家汇报我发现的一个4.0.0版的一个bug,只限于windows版本。那就是:在4.0.0版下,
session.save_path如果使用绝对目录,即加上盘符的话,盘符不起作用。如session.save_path设为
c: emp,此时存在c: emp目录。但是当php程序文件在其它盘上时,如在f盘上,c:不起作用。而是在处理
session时寻找f盘上的 emp目录。如果f盘上无 emp目录,则会报如下错误:
Warning: open( emp/sess_0beef27320944002381aa93c9ec0968d, O_RDWR) failed: m (2)
in f: esta.php3 on line 2
Warning: open( emp/sess_0beef27320944002381aa93c9ec0968d, O_RDWR) failed: m (2)
in Unknown on line 0
Warning: Failed to write session data. Please check that the current setting of
session.save_path is correct (c: emp) in Unknown on line 0
如果在f盘上创建一个temp目录,则错误消失。我查了查源程序,看着很费劲,也没查出来。发现我看
的是4.0.1pl2版的源码。于是我又升级php为4.0.1pl2版,再运行,咦,错误不见了。看来4.0.1pl2版改正
了这个错误。
建议大家装上4.0.1pl2版吧。
同时设置session.save_path时,目录分隔符用'/'或'\'均可。

PHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.

TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.

PHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.

PHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita


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