Do anybody knows what is the full form of the PHP? How much will it cost?

Well, 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 (OSS). PHP is free to download and use.