Six months ago, Facebook open-sourced ?a set of technologies called HipHop for PHP. It was a way to turbocharge PHP. Facebook says it has helped them get faster, it has helped improve php using open-source software that like WordPress, MediaWiki, phpBB and Drupal.
Facebook has come up with HipHop for PHP, a source code transformer that programmatically transforms PHP into highly optimized C++ and uses g++ to compile it. It was developed to boost the performance of Facebook and lower hardware costs and is now being open sourced.