I think issue more that MikroTik choose not to publish API language clients themselves... than the forum. With only exception is MikroTik does publish a Python3 implementation, but its pretty basic
Now they do list API clients on the API help page, including PHP - so I can see the confusion - but I'm not sure MikroTik test or support them. And there was a recent change that an !empty is returned, so IDK if that work in the older PHP library since it predates that change.
You can open a feature request on the support portal for a MikroTik-supported PHP client, but no guarantees of quick action.