First they made HHVM for PHP and then they made the Hack language for HHVM. Hack is based on PHP. I don’t know how much non-Hack PHP they still have but it is m

First they made HHVM for PHP and then they made the Hack language for HHVM. Hack is based on PHP. I don’t know how much non-Hack PHP they still have but it is my impression that they turned pretty much all of their PHP code into Hack code. https://hacklang.org/ https://hacklang.org/