PHP 5 Introduction

PHP is a server-side scripting language.

Basic knowledge you should have

Before continuing, you need to have a basic understanding of the following:

  • HTML
  • CSS

If you want to learn these items first, please visit these tutorials on our homepage .

What is PHP?

  • PHP (full name: PHP: Hypertext Preprocessor, or "PHP: Hypertext Preprocessor") is a universal open source scripting language.
  • PHP scripts are executed on the server.
  • PHP is free to download and use.
note PHP is easy to learn for beginners.

PHP also provides a number of advanced features for professional programmers.

What is a PHP file?

  • PHP files can contain text, HTML, JavaScript code, and PHP code
  • PHP code is executed on the server and the results are returned to the browser in plain HTML
  • The default file extension for PHP files is ".php"

What can PHP do?

  • PHP can generate dynamic page content
  • PHP can create, open, read, write, and close files on the server
  • PHP can collect form data
  • PHP can send and receive cookies
  • PHP can add, delete, and modify data in your database
  • PHP can restrict users from accessing some pages on your site
  • PHP can encrypt data

With PHP, you are no longer limited to outputting HTML. You can output images, PDF files, and even Flash movies. You can also output arbitrary text, such as XHTML and XML.

Why use PHP?

  • PHP runs on different platforms (Windows, Linux, Unix, Mac OS X, etc.)
  • PHP is compatible with almost all currently used servers (Apache, IIS, etc.)
  • PHP provides extensive database support
  • PHP is free and can be downloaded from the official PHP resources: www.php.net
  • PHP is easy to learn and runs efficiently on the server side