How can you take advantage of the Hip Hop Virtual Machine (HHVM) & the Hack programming language two new technologies that Facebook developed to run their web servers? With this practical guide Owen Yamauchi-a member of Facebook&s core Hack & HHVM teams-shows you how to get started with these battle-tested open-source tools You&ll explore static typechecking & several other features that separate Hack from its PHP origins & learn how to set up configure deploy & monitor HHVM Ideal for developers with basic PHP knowledge or experience with other languages this book also demonstrates how these tools can be used with existing PHP codebases & new projects alike Learn how Hack provides static typechecking while retaining PHP&s flexible rapid development capability Write typesafe code with Hack&s generics feature Explore HHVM a just-in-time compilation runtime engine with full PHP compatibility Dive into Hack collections asynchronous functions & the XHP extension for PHP Understand Hack&s design rationale including why it omits some PHP features Use Hack for multitasking & for generating HTML securely Learn tools for working with Hack code including PHP-to-Hack migration