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\n\n A couple of years ago, Facebook switched its production servers from a PHP-to-C++ compiler to their own HipHop Virtual Machine (HHVM) and then launched a new version of PHP to run on HHVM called Hack. This comprehensive guide—written by a member of the core HHVM and Hack teams at Facebook—shows you how to get up and running with both HHVM and Hack.