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Documentation for those that use HHVM and write Hack and PHP code for HHVM.
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.hhconfig Add Reified Generics to docs (#627) Jun 3, 2019 pip3 => pip in travis-deploy Jun 24, 2019 clean up everything at the end of the test run Jun 20, 2019
.travis.yml Try to automatically push to Jun 20, 2019 OSS Automated Fix: Addition of Code of Conduct (#621) Mar 28, 2019 Update documentation for direclty using hphp/test/run May 31, 2019
Dockerfile Update to HHVM 4.10 Jun 19, 2019 Remove need to commit as part of the deployment process Jun 20, 2019
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LICENSE Change license date Jul 27, 2015
LocalConfig.php Split out HSL from /hack/ to /hsl/ Nov 22, 2017
PATENTS Add PATENTS file Jul 7, 2017 Remove the need for explicit ruby dependency installation Jun 5, 2019 Update URL and text to reflect the current AWS UI Dec 18, 2018 Make the README less verbose. Simpler build instructions. Dec 4, 2015
composer.json Update to HHVM 4.10 Jun 19, 2019
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hh_autoload.json Keep the build/final/codegen directory around so autoloader doesnt fail Apr 19, 2019
hhast-lint.json add linter Dec 10, 2017 Specify worker counts Jan 16, 2019 Specify worker counts Jan 16, 2019 Update installation-detailed to say to use PHP to execute composer Jun 6, 2019
legacy-docs-site-index.json Support API reference URLs from the old site Nov 18, 2015 update Jun 5, 2019

HHVM and Hack User Documentation Build Status

This is the repo for the HHVM and Hack user documentation. Contributions and feedback are welcome.

If you see anything egregious, you can file an issue or ping us at #hhvm-dev on Freenode IRC or on Facebook


There are three keys areas to this repo:

  • User Documentation: The guides. We realized that finding out how to do simple things like setting up HHVM to more complicated things like using async were more tedious than they should be. The documentation should be a friend, not a nuisance.
  • API Reference: We use our own HHVM code documentation for Hack and HHVM specific API documentation. And for anything PHP specific, we defer to This serves two purposes:
    • The HHVM source code is the source of truth
    • We don't duplicate PHP documentation, and their documentation will serve as the source of truth for PHP-specific documentation
  • Infrastructure: An easier, more modular and scalable way for documentation. Markdown, not docbook, for user-guide content. Easy to follow, Hack-based source code for building the site.


Our strategy to create better documentation begins with a re-thinking of our doc infrastructure.

  • Markdown instead of docbook provides an easier path for documentation source readability and updates.
    • Have extensions to support things like example insertion, etc.
  • Token scan our the HHVM code block documentation (instead of reflection) so that rebuilding HHVM isn't necessary to update the documentation.
  • Ensure the source code that builds the site is as reusable as possible, so that it has the potential to provide reusability to documentation projects beyond Hack and HHVM.

Check out the source code for building the site. bin/build.php is where all the execution begins.

Running A Local Copy

If you just want to quickly run a copy and don't plan on contributing changes:

  1. Install Docker
  2. docker run -p 8080:80 -d hhvm/user-documentation; this will output a container ID
  3. You can then access a local copy of the documentation at http://localhost:8080
  4. To stop the instance, run docker stop ID_FROM_STEP_2_ABOVE. If you don't have a copy of that ID any more, run docker ps and use the container name in the right-most column instead.

Building The Site

If you would like to build the site locally (e.g., to test your content contributions), you will need to install and configure your system to be able to build and run the site locally.

These are the basic step-by-step instructions to get you up and running. It assumes certain packages are installed on your system. Click here for detailed installation information.

  1. Clone this repository
  2. cd path/to/user-documentation
  3. git submodule update --init
  4. php /path/to/composer.phar install # Make sure you have composer downloaded
  5. hhvm bin/build.php # build the site!

Follow the next steps to access this build from a browser.

Running The Site From A Checkout

Configure a webserver and HHVM to serve the public/ directory, with all requests that don't match a file being served by index.php. For local development, HHVM's built-in webserver should be sufficient:

$ cd public
$ hhvm -m server -p 8080 -c ../

Then, in your browser, go to http://localhost:8080

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