PHP And Friends PHP is now the number one language for Web development under Linux. PHP works by having an engine parse HTML pages that contain PHP code fragments, and interpreting them on the fly. They are similar to ASP (Active Server Pages, commonly used on windows platforms), but support a more elegant and a much stronger language then Jscript or VBScript. PHP supports connections to many types of databases, integration with various transaction systems, support for user sessions, etc. PHP also has now many 3rd-party extension modules that allow extending the base system.