The PHPClasses.org blog has a new post today looking at a recently introduced proposal for updates to the core PHP functionality that could lead to significant speed and overall performance gains. In this latest article they talk about PHPNG.
Not a very long after Facebook announced the Hack language, Dmitry Stogov of Zend announced a somewhat secret development branch of PHP called PHPNG that brings a JIT engine, significant speed and memory management improvements eventually to PHP 6. [...] This branch was added somewhat secretly by Zend developers to the PHP development repository in April 16 but it was openly described only in May 5 when Sebastian Bergmann of the PHPUnit fame asked in the PHP internals about it. Dmitry Stogov of Zend presented a more or less detailed description of the PHPNG branch. He explained that he has been experimenting using a JIT engine (Just In Time compilation to native machine code) using LLVM.
The post talks about the availability of the branch and some of the changes (like updates to extensions) that would need to be made for it to work correctly. There's also a mention about the "plot to kill mod_php" in the future and how the discussion around it reminds the author of the deprecation of the MySQL extension a few years back. The rest of the post compares the PHPNG branch's features with that of one of the other high-performance PHP tools out there, HHVM.