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HHVM is an open-source virtual machine designed for executing programs written inHack. 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 deployProxygen, or aFastCGI-based webserver on top of nginx or Apache.

If you're new, try ourgetting started guide.

You can install aprebuilt package orcompile 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 ourpackage
• Start your webserver
• Runsudo /etc/init.d/hhvm start
• Visit your site athttp://.../main.hack

Ourgetting 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 ourguide to contributing.

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

TheHack typechecker is licensed under the MITLicense except as otherwise noted.

TheHack Standard Library is licensed under the MITLicense except as otherwise noted.

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

For information on reporting security vulnerabilities in HHVM, seeSECURITY.md.

Ouruser FAQ has answers to many common questions about HHVM, fromgeneral questions to questions geared towards those that want touse.

There is also a FAQ forcontributors to HHVM.