Aerys is a new kind of server which has just become open source after years of work. It’s an application server completely written in PHP and based on the Amp Concurrency Framework. If you’re not familiar with Amp yet, you may want to read my previous blog post “Getting Started with Amp” first.
Modern web technology lets us create real time apps within the users browser. WebSockets make this communication dead simple, but traditionally, we couldn’t really write performant WebSocket apps in PHP, because of the single request / response model.