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PHP: Hypertext Preprocessor is a server side scripting language which is most suitable for website development. Php is placed in HTML pages. PHP scripts are executed on the server. PHP supports many databases like MYSQL, Oracle etc.. You can query from db & retrieve data. Almost all free webhosts allow php or provide this service.
PHP files contain html tags and are sent to browser as plain html pages. They might have extension like .php or .php3 or .phtml .
PHP is platform independent.

To practice php on you computer you need to download php parser from http://www.php.net/