How to define super global variables in php
When using global variables in PHP functions, we need to use the global keyword to declare the content used, but if there is no variable declared with the global keyword, we call it a super
Global variables.
Super global variables are variables defined in PHP and cannot be added arbitrarily by users. They mainly store values received from the Web server.
Let’s take a look at the types and formats of superglobal variables
There are currently nine types of superglobal variables in php
$GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION
These are associative arrays, so they are the same as Use the same for other arrays.
For example, if you access the URL https://server.com/user.php?id=123, use $ _GET $ _GET ["id"], you can get "123".
The above is the detailed content of How to define super global variables 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

AI Hentai Generator
Generate AI Hentai for free.

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

This article details implementing message queues in PHP using RabbitMQ and Redis. It compares their architectures (AMQP vs. in-memory), features, and reliability mechanisms (confirmations, transactions, persistence). Best practices for design, error

This article examines current PHP coding standards and best practices, focusing on PSR recommendations (PSR-1, PSR-2, PSR-4, PSR-12). It emphasizes improving code readability and maintainability through consistent styling, meaningful naming, and eff

This article details installing and troubleshooting PHP extensions, focusing on PECL. It covers installation steps (finding, downloading/compiling, enabling, restarting the server), troubleshooting techniques (checking logs, verifying installation,

This article explains PHP's Reflection API, enabling runtime inspection and manipulation of classes, methods, and properties. It details common use cases (documentation generation, ORMs, dependency injection) and cautions against performance overhea

PHP 8's JIT compilation enhances performance by compiling frequently executed code into machine code, benefiting applications with heavy computations and reducing execution times.

This article explores strategies for staying current in the PHP ecosystem. It emphasizes utilizing official channels, community forums, conferences, and open-source contributions. The author highlights best resources for learning new features and a

This article explores asynchronous task execution in PHP to enhance web application responsiveness. It details methods like message queues, asynchronous frameworks (ReactPHP, Swoole), and background processes, emphasizing best practices for efficien

This article addresses PHP memory optimization. It details techniques like using appropriate data structures, avoiding unnecessary object creation, and employing efficient algorithms. Common memory leak sources (e.g., unclosed connections, global v
