Re: Resurrecting named parameters

On Tue, Apr 7, 2020 at 2:45 PM Nikita Popov <nikita.ppv@gmail.com> wrote: > > ## LSP checks for parameter names > > Parameter names currently have no particular significance in PHP, only > their position in the signature is important. If named parameters are > introduced (in a way that does not require opt-in at the declaration-site), > then parameter names become significant. This means that changing a > parameter name during inheritance constitutes an LSP violation (for > non-constructor methods). There are a number of ways in which this issue > may be approached: > > 1. Silently ignore the problem. No diagnostic is issued when a parameter > name is changed during inheritance. An error exception will be thrown when > trying to use the (now) unknown parameter name. I prefer this approach. It might seem inelegant at first but I believe none of the other options will do us any real favors, especially stronger LSP enforcement on the language level. And opt-in seems like a non-starter for reasons Rowan Tommins lay out (though he's in favor :-) Dev side tools will be fully able to "deal" with the downfall.