The previous article introduced to you "What are the vulnerabilities of commonly used functions in PHP? 》, this article continues to introduce to you how to use session in session control in PHP? It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
Session control (use of session)
How to use session
The operation of session is exactly the same as the operation of array.
If you use session in the page, you must first open the session (session_ start()) session at the beginning of the page.
Set or get sess ionid; through function sessionid();
Add session
- $ SESSION['下标'] -值;
Modify session
$ SESSION['下标'] -新值;
Delete session
1. Delete the variable value of the session (retain the data type)
$ SESSION - array();
2. Delete all session information (including files) - generally used for exit operations
1. Make the SESSIONID in the client COOKIE Expired.
2. Clear the variable value of page SESSION
3. Destroy the SESSION file of the server
使用session 查看全部SESSION信息 var_ dump( )或者print_ r(); 使用其中sesssion的某个元素 $_ SESSION[下标];|
First we create a new page (login page), and then create a new PHP page
1得到用户输入的用户名和密码 2.然后在数据库中查询是否有该用户的存储 //$sql = "SELECT id FROM user WHERE name=用户 输入的用户名&& pwd=等于用户输入的密码加密后的字符串”; //有数据 密码正确登录成功 //没有数据 提示用户名或密码错误 请注册
Then we create a new file (1.PHP): the code is as follows
<?php if(isset($_SESSION['user']['islogin']) && $_SESSION['user'][ 'islogin'] == true){ //已经登录 echo '亲爱的'. $_SESSION['user']['name']. '会员,欢迎您回来<br/>' ; echo '这是a页面<br/>'; echo '<a href="index . php">去首页</a><br/>'; echo '<a href="b. php">去b页面</a><br/>'; echo '<a href="c . php" >去c页面</a><br/>'; }else{ //用户没有登录 echo ' 对不起,您无权访问3S后自动跳转到登录页面' ; echo ' <meta http- equiv=" refresh" content="3;url=./login. html">' ; }
Then we create a new file (2.PHP): the code As follows
<?php if(isset($_SESSION['user']['islogin']) && $_SESSION['user'][ 'islogin'] == true){ //已经登录 echo '亲爱的'. $_SESSION['user']['name']. '会员,欢迎您回来<br/>' ; echo '这是2页面<br/>'; echo '<a href="index . php">去首页</a><br/>'; echo '<a href="b. php">去b页面</a><br/>'; echo '<a href="c . php" >去c页面</a><br/>'; }else{ //用户没有登录 echo ' 对不起,您无权访问3S后自动跳转到登录页面' ; echo ' <meta http- equiv=" refresh" content="3;url=./login. html">' ; }
Then we create a new file (3.PHP): The code is as follows
<?php if(isset($_SESSION['user']['islogin']) && $_SESSION['user'][ 'islogin'] == true){ //已经登录 echo '亲爱的'. $_SESSION['user']['name']. '会员,欢迎您回来<br/>' ; echo '这是3页面<br/>'; echo '<a href="index . php">去首页</a><br/>'; echo '<a href="b. php">去b页面</a><br/>'; echo '<a href="c . php" >去c页面</a><br/>'; }else{ //用户没有登录 echo ' 对不起,您无权访问3S后自动跳转到登录页面' ; echo ' <meta http- equiv=" refresh" content="3;url=./login. html">' ; }
Then we create a new file (index. PHP): The code is as follows
<?php //var_dump($_COOKIE); //这是项目的首页 if(isset($_SESSION[ 'user' ]['islogin']) && $_SESSION['user'][ 'islogin'] == true){ //已经登录 echo '亲爱的'.$_ SESSION[ 'user'][ 'name' ].'会员,欢迎您回来<br/>' ; echo '<a href="1.php">去1页面</a><br/>'; echo '<a href= "2.php" >去2页面</a><br/>'; echo '<a href="3.php">去3页面</a><br/>'; }else{ //用户没有登录 echo '对不起,您无权访问3S后自动跳转到登录页面' ; echo '<meta http- equiv=" refresh" content="3;url=./login. html">'; }
Recommended learning: "PHP Video Tutorial"
The above is the detailed content of How to use session in session control in PHP?. For more information, please follow other related articles on the PHP Chinese website!

The article compares ACID and BASE database models, detailing their characteristics and appropriate use cases. ACID prioritizes data integrity and consistency, suitable for financial and e-commerce applications, while BASE focuses on availability and

The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.

Article discusses best practices for PHP input validation to enhance security, focusing on techniques like using built-in functions, whitelist approach, and server-side validation.

The article discusses strategies for implementing API rate limiting in PHP, including algorithms like Token Bucket and Leaky Bucket, and using libraries like symfony/rate-limiter. It also covers monitoring, dynamically adjusting rate limits, and hand

The article discusses the benefits of using password_hash and password_verify in PHP for securing passwords. The main argument is that these functions enhance password protection through automatic salt generation, strong hashing algorithms, and secur

The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.

The article discusses strategies to prevent XSS attacks in PHP, focusing on input sanitization, output encoding, and using security-enhancing libraries and frameworks.

The article discusses the use of interfaces and abstract classes in PHP, focusing on when to use each. Interfaces define a contract without implementation, suitable for unrelated classes and multiple inheritance. Abstract classes provide common funct


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Dreamweaver CS6
Visual web development tools

WebStorm Mac version
Useful JavaScript development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Mac version
God-level code editing software (SublimeText3)