PHP powers an enormous share of the web, so a screen of it implies access to exactly the kind of site everyone actually uses. Dollar-sign variables and arrow operators make it recognizable at a glance, even to people who last saw PHP in 2009.
The sample is modern, namespaced PHP: an application controller working with User and Transaction models, written in present-day MVC style rather than the spaghetti of legend. Displayed, never served.
Like every HackerTyping screen, this is harmless entertainment: the PHP code is a local, prewritten sample that is displayed and never executed, and your keystrokes are never recorded. See the main hacker typer, the filmmaker guide for shooting tips, or the privacy policy. A project of Wild Monkey Labs.