The MediaWiki extensions run the PHPUnit test suite with Zend. We should switch to hhvm and run zend+hhvm on gate-and-submit.
@Legoktm did that for mediawiki/core with https://gerrit.wikimedia.org/r/#/c/197951/ . There is even a new Zuul pipeline zend which lets folks manually trigger the zend job on open patch sets.
For wikibase that is proposed with T101382: Only run Wikibase Zend Jenkins jobs on gate-and-submit
Thoughts?