A virtual machine for executing programs written in Hack.
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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.
If you're new, try our getting started guide.
You can run standalone programs just by passing them to hhvm:
sudo /etc/init.d/hhvm start* Visit your site at
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.
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.
There is also a FAQ for contributors to HHVM.