The previous else if() should just become else, and this one removed.
The original idea was to prevent a situation 2years down the road where we may not be supporting the latest write api and a user running oooold PHP driver with a new server (which for stupidity reason, didn't conflict wire version - or we fckdup the wire version check)...
Maybe I was just overthinking it, but the plan was to have this else case raise UnsupportedOperation exception of some sort.