On The Changelog podcast today hosts Adam and Jerod talk with Sara Golemon (of Facebook) about the PHP specification that was released a bit back by a group, largely at Facebook, to help define how the PHP language functions.

Some of the topics mentioned in this episode include:

• HipHop VM (HHVM)
• the php.internals mailing list thread about the specification's release
• Sara's extensions book
• The Hack language
• the AST and switch default multiple RFCs

You can listen to this episode either through their in page audio player or by downloading the mp3. If you enjoy it, be sure to subscribe to their feed and get the latest updates as they're released.