PHP is a popular general-purpose scripting language that is especially suited to web development.
Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world.
PHP code is easily embedded into HTML code or utilized in combination with various Web template systems and web frameworks. PHP code is processed by a PHP interpreter implemented as a module in the web server or as a Common Gateway Interface (CGI) executable. The web server will combine the results of the interpreted and executed PHP code, which may be any data type, including images, with the generated web page. PHP code may also be performed with a command-line interface (CLI) and can be used to implement standalone graphical applications.
The standard PHP interpreter, powered by the Zend Engine, is free software released under the PHP License. PHP has been widely ported and can be deployed on most web servers on almost every operating system and platform, free of charge.
Version History for PHP: http://www.php.net/ChangeLog-7.php#7.1.10