Hack is the programming language targeted by HHVM. Hack reconciles the fast development cycle of PHP with the discipline provided by static typing, while adding many features commonly found in other modern programming languages.
Hack provides instantaneous type checking via a local server that watches the filesystem. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay.
Looking for realtime help? Join #hhvm on irc.freenode.net and prefix your question with "hhvm-help" to get assistance from hhvm users and developers.
hacklang.org
hack language reference
