Are you staring at a legacy application, wishing you could give its front-end a modern, dynamic facelift without a full rewrite? Have you invested in a server-side rendering framework like Twig, but have stakeholders who feel like full-page reloads feel sluggish when compared to a slick, single-page application? In this article, we’ll look at how to progressively enhance a PHP application using a lightweight, non-intrusive library called Unpoly.js. by Oscar Merida