On the Symfony Finland blog there's a new post showing you how to serve PHP over HTTP/2 with HHVM and H2O. H2O describes itself as a "new generation HTTP server providing quicker response to users when compared to older generation of web servers".
This article is not about improvements made in HTTP/2 - as there are plenty of locations for you to read up on the internals. It's a hands on article to get started using HTTP/2 today with popular tools such as Symfony, WordPress and Drupal with the HHVM PHP runtime from Facebook. You can just as well use PHP-FPM.
They start with a bit of a look at the current state of PHP and HTTP/2 on the various major web server types. H2O, while younger, natively supports HTTP/2, he does offer the caveat that "waiting won't kill you". Despite this, they go on to show you how to set up the PHP+H2O+HHVM combination complete with configuration examples and what to look for in the logs to ensure HTTP/2 functionality.