Thanks for the PHP spec.
Btw. GitHub says "Sorry, this blob took too long to generate.":
Personally, this is exciting news, but I'm not sure that PHP is ready for this after 20 years. There's plenty of cleanup that needs to be done to userland naming conventions and parameter orders that in all likelihood won't get done anytime soon to avoid breaking BC
PHP ships with a lot of third party C libraries that are exposed in PHP with usually their original function names. Object orientation came with PHP 4 and later with PHP 5 the new better one (5.3+ with namespace support, traits, etc.).
I'm not sure that I would call PHP4 objects object oriented, as I remember it, it was all such a huge hack (down to being able to return null from a constructor). I only had to maintain some code like that at the tail end of PHP4's life, so I never found out whether that was how OOP was done in PHP4, or if it was a hack to simulate OOP in a language that didn't support it.