HHVM and Hack Documentation

Hack

• Getting Started

  • Getting Started

    Installing Hack, running your first program, and introducing the tools.

  • Source Code Fundamentals

    Basic syntax, namespaces, and the autoloader.

  • Functions

    Named functions, anonymous functions and parameters.

  • Arrays And Collections

    Hack arrays, (legacy) PHP arrays, and mutable collections.

  • Built In Types

    Built-in types known to the type checker.

  • Silencing Errors

    HH_FIXME best practices and error codes.

• Control Flow

  • Expressions And Operators

    Expressions, operators, associativity, and precedence.

  • Statements

    Simple statements, blocks, and loops.

  • Asynchronous Operations

    Asynchronous functions, await, and the concurrent keyword.

• Classes, Interfaces, Traits

  • Classes

    Classes provide a way to group functionality and state together.

  • Traits And Interfaces

    Implementing class capabilities and optimizing code reuse.

  • Attributes

    Attaching metadata to Hack programs, built-in attributes and defining your own.

  • XHP

    Safe, composable HTML templating.

• Types and Generics

  • Types

    The type checker.

  • Generics

    Generic types, where constraints, and variance.

  • Contexts And Capabilities

    A generalized system for the description and enforcement of permissions and restrictions of a context.

  • Reified Generics

    Generics with type information accessible at runtime.

• Advanced Features

  • Readonly

    Specialized feature for performantly controlling object mutability

• Experimental Additions

  • Experimental Features

    Experimental features in the Hack language.

Hack API Reference

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

Hack Standard Library Reference

Full reference docs for all functions, classes, interfaces, and traits in the Hack Standard Library (HSL).

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.

  • FAQ

    Common information and questions regarding HHVM.