PHP

PHP is the scripting language in which Moodle is developed. PHP does not stand alone, it is tightly integrated with a suitable HTTP Server. Most people use the Apache HTTP Server for this purpose although a number of others are supported.

PHP describes itself thus:

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

PHP home page: http://www.php.net/