菜鸟PHP $_SESSION['liuyanyzm']!==$_POST['yzm']比较时出错了-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

菜鸟PHP $_SESSION['liuyanyzm']!==$_POST['yzm']比较时出错了

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 13, 2016 am 10:43 AM

postquotsession

初学者PHP $_SESSION['liuyanyzm']!==$_POST['yzm']比较时出错了
echo "session:".$_SESSION['liuyanyzm'].'
';
echo "表单：".$_POST['yzm'];
if(isset($_POST['submit']) and $_POST['submit']=="提交"){
if($_SESSION['liuyanyzm']!==$_POST['yzm']){
echo '';
}
}
?>
搞不明白为什么$_SESSION['liuyanyzm']和$_POST['yzm']都能打印出来，但是为什么比较都是false呢？各位帮我看看，谢谢了！（初学者）

------解决方案--------------------
var_dump($_SESSION['liuyanyzm'], $_POST['yzm']);
贴出结果
------解决方案--------------------
显示页面与处理页面分开
------解决方案--------------------
没有看到 $_SESSION['liuyanyzm'] 在哪里赋值的
------解决方案--------------------
$_SESSION['liuyanyzm']和$_POST['yzm']类型不同，一个是int，一个string，所以肯定是false
改成这样试试
if($_SESSION['liuyanyzm']!=$_POST['yzm'])

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

What data can be stored in a PHP session?May 02, 2025 am 12:17 AM

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

How do you start a PHP session?May 02, 2025 am 12:16 AM

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

What is session regeneration, and how does it improve security?May 02, 2025 am 12:15 AM

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.

What are some performance considerations when using PHP sessions?May 02, 2025 am 12:11 AM

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.

How do PHP sessions differ from cookies?May 02, 2025 am 12:03 AM

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

How does PHP identify a user's session?May 01, 2025 am 12:23 AM

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

What are some best practices for securing PHP sessions?May 01, 2025 am 12:22 AM

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.

Where are PHP session files stored by default?May 01, 2025 am 12:15 AM

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

See all articles