Facebook has made their official announcement about their secretive PHP project today and have scheduled an event for them to give the world more information on the project.
Today I'm excited to share the project a small team of amazing people and I have been working on for the past two years; HipHop for PHP. With HipHop we've reduced the CPU usage on our Web servers on average by about fifty percent, depending on the page. Less CPU means fewer servers, which means less overhead. This project has had a tremendous impact on Facebook. We feel the Web at large can benefit from HipHop, so we are releasing it as open source this evening in hope that it brings a new focus toward scaling large complex websites with PHP.
The post elaborates a bit more on what the tool is (not really a compiler, more of an optimizer) and why they decided to go this direction. There's a bit of description on how the tool works and how the transformation happens.
Stay tuned to this post around 7:30pm Pacific time for more information.