They want to break backwards compatibility. That would arguably be a bad thing for PHP as a language. It's apparently something they need for themselves though.

They want to break backwards compatibility. That would arguably be a bad thing for PHP as a language. It's apparently something they need for themselves though. The only choice that isn't being a bad citizen is to break away from PHP. PHP. Can freely being in any improvements that fit their model, but the goals of the two projects are no longer compatible.