关于php获取变量问题
- PHP code
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ -->@$judge=$_GET["speed"]; if(@$keyboard=$_GET["keyboard"]){ $keyboardfinal=100; } if(@$judge==1){ if($keyboard0){ @$keyboardfinal=50; } } if(@$judge==2){ if(@$keyboard0){ $keyboardfinal=50; } } if(@$judge==3 && (@$keyboard0)){ $keyboardfinal=50; }
如上代码~为什么在第二,三,四个if语句中,即使条件成立任然无法使$keyboardfinal=50;成立为什么呢?
------解决方案--------------------
@$judge=$_GET["speed"];
为什么变量前面加@有什么特别效果吗?
------解决方案--------------------
不明白楼主为什么要加那么多错误控制符,如果不报出错误,你怎么修改代码呢?
将楼主的代码修改了下:
- PHP code
$judge = 1; $keyboard = 35; $keyboardfinal = null; switch($judge){ case 1: if($keyboard0) $keyboardfinal=50; break; case 2: if($keyboard0) $keyboardfinal=50; break; case 3 && ($keyboard0): $keyboardfinal=50; break; } echo "keyboardfinal-->>".$keyboardfinal; #50 <br><font color="#e78608">------解决方案--------------------</font><br>

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

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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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