If your server supports PHP you don't need to do anything.Just create some .php files in your web directory, and the server will parse them for you. Because it is free, most web hosts offer PHP support.However, if your server does not support PHP, you must install PHP.Here is a link to a good tutorial from PHP.net on how to install PHP5: http://www.php.net/manual/en/install.php

Download PHP for free here: http://www.php.net/downloads.php

Download MySQL for free here: http://www.mysql.com/downloads/index.html

Download Apache for free here: http://httpd.apache.org/download.cgi

Note: If you want simple installation for use PHP, you just need install WAMP or XAMPP Application.

• PHP stands for PHP: Hypertext Preprocessor
• PHP is a server-side scripting language, like ASP
• PHP scripts are executed on the server
• PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.)
• PHP is an open source software
• PHP is free to download and use
• PHP files can contain text, HTML tags and scripts
• PHP files are returned to the browser as plain HTML
• PHP files have a file extension of ".php", ".php3", or ".phtml"
• PHP runs on different platforms (Windows, Linux, Unix, etc.)
• PHP is compatible with almost all servers used today (Apache, IIS, etc.)
• PHP is FREE to download from the official PHP resource: www.php.net
• PHP is easy to learn and runs efficiently on the server side
• PHP combined with MySQL are cross-platform (you can develop in Windows and serve on a Unix platform)
• MySQL is a database server
• MySQL is ideal for both small and large applications
• MySQL supports standard SQL
• MySQL compiles on a number of platforms
• MySQL is free to download and use