kess Hi Kess, I don't think this one will be possible. As a Website is considered a container, which itself is the PHP/SSH seperation in a docker container. So the isolation layer from the host. All domains, or addon websites added will have to use this PHP version. (Baked into the dockerfile and container remade as changed)
If you wanted different versions of PHP you'd need different containers, such as, different "websites". (the naming will be opened up to us, to choose container over website in future)
There is another feature request for PHP to have it's extensions etc... be more customisable. Again that would be per website (container).