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HHVM is an open-source virtual machine designed for executing programs written in Hack. HHVM uses a just-in-time (JIT) compilation approach to achieve superior performance while maintaining amazing development flexibility.

HHVM should be used together with a webserver like the built in, easy to deploy Proxygen, or a FastCGI-based webserver on top of nginx or Apache.

If you're new, try our getting started guide.

You can install a prebuilt package or compile from source.

You can run standalone programs just by passing them to hhvm: hhvm example.hack.

If you want to host a website:

• Install your favorite webserver. Proxygen is built into HHVM, fast and easy to deploy.
• Install our package
• Start your webserver
• Run sudo /etc/init.d/hhvm start
• Visit your site at https://.../main.hack

Our getting started guide provides a slightly more detailed introduction as well as links to more information.

We'd love to have your help in making HHVM better. If you're interested, please read our guide to contributing.

HHVM is licensed under the PHP and Zend licenses except as otherwise noted.

The Hack typechecker is licensed under the MIT License except as otherwise noted.

The Hack Standard Library is licensed under the MIT License except as otherwise noted.

See Reporting Crashes for helpful tips on how to report crashes in an actionable manner.

For information on reporting security vulnerabilities in HHVM, see SECURITY.md.

Our user FAQ has answers to many common questions about HHVM, from general questions to questions geared towards those that want to use.

There is also a FAQ for contributors to HHVM.