PHP is an HTML-embedded scripting language.
PHP attempts to make it easy for developers to write dynamically generated web pages.
PHP also offers built-in database integration for several commercial and non-commercial database management systems, so writing a database-enabled webpage with PHP is fairly simple.
The most common use of PHP coding is probably as a replacement for CGI scripts. This package is a meta-package with the usual Recommends and Requires. This version has been compiled with GCC.