PHP is a popular open-source scripting language. It is widely deployed as a web-server side scripting language. PHP scripts are embedded within HTML pages.

PHP offers excellent support for many databases like MySQL, Oracle etc. This makes it even more relevant for web-servers since web-applications, typically, use databases to store data.

This module on PHP presents an overview of PHP elements like variables, loops, conditional expressions, functions, arrays, strings, objects, error-handling, and interaction with MySQL and HTML. A good understanding of these concepts would allow the to develop high-quality, robust, and scalable PHP applications.