This is amazing, and way more advanced than what was there. Going to definitely use it on the next project.
Previously, there was https://github.com/deuill/go-php which was PHP5 and PHP7, but you needed to build PHP with ZTS. I had to forke it to focus on PHP5 and bring some improvements - my primary goal was to port some legacy PHP over iteratively via the Strangler pattern. If it can still be useful to some, the fork is here - https://github.com/borancar/go-php