What is HHVM? HHVM Stands for Hip Hop Virtual Machine and has been released with an Open Source License by Facebook. HHVM is an open-source virtual machine designed for executing programs written in Hack and PHP. HHVM uses a just-in-time (JIT) compilation approach to achieve superior performance while maintaining the development flexibility that PHP provides. HHVM runs much of the world’s existing PHP. Developers and hosts are...