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Xiaobian to share with you how to use local, global and static keywords in PHP, I believe most people do not know how to use, so share this article for your reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!

Introduction to PHP

PHP is an acronym for PHP Hypertext Preprocessor.

PHP is a widely used open source scripting language. PHP scripts are executed on the server.

PHP is a powerful server-side scripting language for creating dynamic interactive sites.

PHP is free, easy to learn, and powerful, such as WordPress, Facebook.

PHP file

PHP files can contain text, HTML, CSS, and PHP code

PHP code is executed on the server, and the results are returned to the browser in plain text

PHP files have the suffix ".php"

What can PHP do?

PHP can generate dynamic page content

PHP can create, open, read, write, delete, and close files on the server

PHP is able to receive form data

PHP can send and retrieve cookies

PHP can add, delete, and modify data in a database

PHP is able to restrict user access to certain pages of a website

PHP can encrypt data

Why use PHP?

PHP runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)

PHP is compatible with almost all servers (Apache, IIS, etc.)

PHP supports multiple databases

PHP is free. Please download from official PHP resources: www.php.net

PHP is easy to learn and runs efficiently on the server side

Getting started with PHP

You can use web hosts that support PHP and MySQL.

You can also install a web server on your PC and then install PHP and MySQL.

Run on PHP-enabled Web hosts: Create.php files and upload them, and the server will parse them automatically.

Run PHP on your PC: Install web server, install PHP, install database (like MySQL).

examples

Tip: With PHP, you are not limited to outputting HTML only. You can also export images, PDF files, and even Flash movies. You can also output any text, such as XHTML and XML.

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