WordPress has never officially supported HHVM, but since WordPress 4.0 it has been compatible, largely thanks to the efforts of @wonderboymusic in #27881 and other tickets. Many large scale sites which switched to HHVM around 2014 have since switched to PHP 7, and usage numbers of HHVM according to the wordpress.org update statistics indicate that … Continue reading HHVM no longer part of WordPress core’s testing infrastructure