Gonzalo Ayuso has a quick post to his site showing you how to make a "PHP dumper" for websocket connections based on a simple Silex application.
Another crazy idea. I want to dump my backend output in the browser's console. There're several PHP dumpers. For example Raul Fraile's LadyBug. There're also libraries to do exactly what I want to do, such as Chrome Logger. But I wanted to use Websockets and dump values in real time, without waiting to the end of backend script. Why? The answer is simple: Because I wanted to it.