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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 the development flexibility that PHP provides.
HHVM is intended for Hack projects, and also supports a large subset of PHP 7 that is required by common tools and libraries. We no longer recommend using HHVM for purely PHP projects.
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 in to HHVM, fast and easy to deploy.
- Install our package
- Start your webserver
- Run
sudo /etc/init.d/hhvm start - Visit your site at
http://.../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.
See Reporting Crashes for helpful tips on how to report crashes in an actionable manner.
Please do not open GitHub issues or pull requests - this makes the problem immediately visible to everyone, including malicious actors. Security issues in HHVM can be safely reported via HHVM's Whitehat Bug Bounty program:
https://www.facebook.com/whitehat
Facebook's security team will triage your report and determine whether or not is it eligible for a bounty under our program.
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.