FAQ

• General
• Users
• Contributors

General

What is the history of HHVM?

For a history of what is now HHVM, please visit our Wikipedia page

How does Facebook use and run HHVM?

Facebook's entire desktop site runs on HHVM.

What is the roadmap for HHVM?

Are there are any videos, presentations, etc. about HHVM?

For a discussion about HHVM and its benefits, please see [this PHP UK Conference 2013 presentation] (http://www.youtube.com/watch?v=Dwek7dZDFN0) For a deep dive into the HHVM internals, please see this QCon 2012 presentation. Other information can be found in the references of our Wikipedia page.

Who are the key players on the HHVM team?

You can see a list of common contributors to HHVM [on the Github contributors page]. Key people include Sara Golemon, Paul Tarjan and Sean Cannella.

Users

How do I install HHVM? Where are the binaries?

How do I configure HHVM? What are my options?

What code does HHVM currently run?

What is known to be broken with HHVM?

What do I do if I run into a problem (e.g., an error, fatal or segfault)?

When is HHVM going to run my code?

When will HHVM support Apache?

What PHP extensions does HHVM currently support?

The list of supported extensions can be found in the extensions directory of the hhvm codebase: https://github.com/facebook/hiphop-php/tree/master/hphp/runtime/ext

Contributors

How do I contribute to HHVM?

What is the HHVM team currently working on?

I want to port extensions to HHVM. How do I do that?

Where are ported extensions located in the codebase?

What is the process for committing code to HHVM?

How do I test code that I write for HHVM?

Where are the technical specifications for the HHVM runtime (e.g., bytecode spec)?

I need a feature, but don't know how to implement it? What can I do to get this feature into HHVM?