PHP Programming & Application Development

"PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML."
More from PHP.net

"PHP is a reflective programming language originally designed for producing dynamic web pages. PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses. PHP is a recursive acronym for 'PHP: Hypertext Preprocessor'."
More from Wikipedia