


Implement the session and cookie data value transfer function in PHP
1.session After logging in to the previous page, if there is no operation for a long time, you need to log in again after refreshing the page.
Features: (1) The session is stored on the server;
(2) Each person (login) saves a copy of the session;
(3) The session has a default Expiration time; (If too many people log in, there will be too much data. Since it is stored on the server, it will put pressure on the server and will be cleared after a certain period of time)
(4) Any arbitrary data can be stored in the session type of data.
From the above characteristics, it can be concluded that the characteristics of session are relatively safety. The disadvantage is that it puts a certain amount of pressure on the server.
(5) When a page needs to use session, you need to add session_start() at the top of the page; it should be written at the top of the page, and no code can appear in front. The code refers to the PHP code, which can be There is HTML code. It is best to develop a habit and write at the top of the page. Just write one page once.
(6) Manipulate session. a. Assignment. b. Value.
Assignment:
<?php session_start();//session开始标签,在最顶部写。?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> <?php $_SESSION["uid"] = "zhangsan";//给$_SESSION["uid"]赋值。?> </body> </html>
Value:
The value can be obtained on any page, for example, when making a login page, you can Assign the login name, password name and other information to $_SESSION["uid"]. You can also get the login name, password name and other values from other pages on the same browser, provided that the assigned page has been opened first. If you directly open other pages to get the value, you will not be able to get it. Then, if you close the browser and then open it again, you must first open the assignment page before other pages can get the value.
<?php session_start();?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> <?php echo $_SESSION["uid"]?> </body> </html>
2. Cookie
Features: (1) Cookies are stored on the client side, and the browser will have a cookie clearing option when clearing browsing information.
(2) Save one cookie per person.
(3) There is no default expiration time for cookies.
(4) Only strings can be stored.
From the above characteristics, it can be concluded that cookies are not safe and will not put pressure on the server.
If there are no special requirements, both session and cookie can be used, but when it comes to higher security, session should be selected.
The above is the detailed content of Implement the session and cookie data value transfer function in PHP. For more information, please follow other related articles on the PHP Chinese website!

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

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

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

Hot Topics

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
