HHVM and Hack Documentation

Hack

Learn

• Overview

  A quick introduction to some of Hack's major features.

• Getting Started

  Five simple steps to installing Hack, and making your first program.

• Tools

  Tools to help you build Hack apps, like Nuclide - our IDE - or PHP to Hack migration helpers.

• FAQ

  Common information and questions around Hack.

• Types

  Introducing typing of parameters, variables, and return values, to prevent errors and make code more readable.

• Async

  Hack introduces async programming to PHP, letting your apps scale better and reduce blocking.

• Collections

  Improving upon PHP’s arrays with Vectors, Sets, Maps, and other Collections.

• XHP

  An easily reusable and customizable UI system that automatically handles escaping and XSS protection.

• Typechecker

  The bread and butter tool of Hack to ensure code type safety.

• Shapes

  Adding structure and type-checking to arrays used as structs or records.

• Tuples

  Bundle together values of possibly different types.

• Enums

  First-class enumeration types.

• Generics

  Code that works with multiple types and is type safe.

• Type Aliases

  Create complex type structures with type aliases

• Lambdas

  A simplified closure syntax.

• Type Constants

  An alternative to generics with types declared as members of a class.

• Attributes

  Decorate classes and methods with meta information.

• Operators

  Hack has various operators like null-safe and lambda.

• Callables

  An alternative to the PHP callable typehint.

• Other Features

  Various other Hack features like constructor parameter promotion.

• Unsupported

  Hack doesn't support some common PHP features and idioms.

Hack API Reference

Full reference docs for all functions, classes, interfaces, and traits in the Hack language.

HHVM

Learn

• Getting Started

  Get started with HHVM quickly and easily.

• Installation

  How to install HHVM on a supported platform.

• Basic Usage

  The easiest way to run HHVM, with sensible defaults.

• Advanced Usage

  Advanced usage, with more ways to run and configure HHVM.

• Configuration

  How to configure HHVM with various user-configurable options.

• Extensions

  The built in and dynamic extensions that HHVM currently supports.

• Inconsistencies

  Differences between HHVM and the PHP engine when running code.

• FAQ

  Common information and questions regarding HHVM.