Method: First detect whether the variable exists through "if(isset($_SESSION["Variable"]))"; if it exists, use session_unset() and session_destroy() to release the session; finally use header( ) function jumps to the login interface.
Recommended: "PHP Video Tutorial"
In the PHP program, after the login is completed, it will be stored in the session , when logging out, the session needs to be released. The corresponding code is as follows.
<?php
session_start();
if(isset($_SESSION["uid"])) // 检测变量是否设置
{
session_unset(); // 释放当前在内存中已经创建的所有$_SESSION变量，但是不删除session文件以及不释放对应的session id；
session_destroy(); // 删除当前用户对应的session文件以及释放session id，内存中$_SESSION变量内容依然保留；
}
header("location:login.php"); // 重定向到登录界面
?>It should be noted that:
session_unset(); releases all $_SESSION variables currently created in the memory, but does not delete the session file and does not release the corresponding session id;
session_destroy(); deletes the session file corresponding to the current user and releases the session id. The content of the $_SESSION variable in the memory is still retained;
The above is the detailed content of How to implement the logout function in php?. For more information, please follow other related articles on the PHP Chinese website!
ACID vs BASE Database: Differences and when to use each.Mar 26, 2025 pm 04:19 PMThe 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
PHP Secure File Uploads: Preventing file-related vulnerabilities.Mar 26, 2025 pm 04:18 PMThe 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.
PHP Input Validation: Best practices.Mar 26, 2025 pm 04:17 PMArticle discusses best practices for PHP input validation to enhance security, focusing on techniques like using built-in functions, whitelist approach, and server-side validation.
PHP API Rate Limiting: Implementation strategies.Mar 26, 2025 pm 04:16 PMThe 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
PHP Password Hashing: password_hash and password_verify.Mar 26, 2025 pm 04:15 PMThe 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
OWASP Top 10 PHP: Describe and mitigate common vulnerabilities.Mar 26, 2025 pm 04:13 PMThe 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.
PHP XSS Prevention: How to protect against XSS.Mar 26, 2025 pm 04:12 PMThe article discusses strategies to prevent XSS attacks in PHP, focusing on input sanitization, output encoding, and using security-enhancing libraries and frameworks.
PHP Interface vs Abstract Class: When to use each.Mar 26, 2025 pm 04:11 PMThe 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
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Zend Studio 13.0.1
Powerful PHP integrated development environment
WebStorm Mac version
Useful JavaScript development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
Dreamweaver Mac version
Visual web development tools
