HipHop VM (HHVM) is a new open-source virtual machine designed for executing programs written in PHP. HHVM uses a just-in-time compilation approach to achieve superior performance while maintaining the flexibility that PHP developers are accustomed to. HipHop VM (and before it HPHPc) has realized >5x increase in throughput for Facebook compared with Zend PHP 5.2.

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The latest information is available on the wiki.

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

Before changes can be accepted a Contributors Licensing Agreement must be signed and returned.