PHP is a general-purpose scripting language widely used as a server-side language for creating dynamic web pages. Though its reputation is mixed, PHP is still extremely popular and is used in over 75% of all websites where the server-side programming language is known.
If interested in learning the basics and an introduction to the PHP language, we'd recommend the Learn PHP course. To view all of the courses and Paths that teach PHP and learn more about the language, please see the PHP course catalog.