When WordPress was first created, PHP was the obvious language to write it in. The language was pervasive, was all but ubiquitous on hosting servers and was considered a current language. That has changed. PHP is as ubiquitous as ever, but now showing its age. The next generation of developers aren’t flocking to PHP and most modern web apps are written in something else. So what is an open source project like WordPress to do? With a PHP codebase, you are effectively creating an interest barrier for many younger developers to contribute to your open source project. WordPress may be the biggest current example, but this conundrum is going to be a continual problem for other large open source projects. How do you keep an open source project modern and relevant when it’s built on top of an aging language?