On Mon, Aug 31, 2020 at 10:35 AM David Rodrigues <david.pro...@gmail.com> wrote: >> It should be possible for the engine (at some layer) to look at that closure >> and see that it's just negating some proxied call and elide setting up the >> intermediate frame. Microoptimizations SHOULD be the engine's job, not userspace's. >> > > I really think that it should be a good solution, but how hard should it be to create a proxy like that? >
We already have a few examples of proxies of this sort. Closure::fromCallable() comes to mind in particular. We could detect the `fn($x) => !y($x)` pattern and replace it with a callable of y with negation (and a few other common idioms). I wouldn't vote against a flag on array_filter(), because doing the quick and easy thing is very much in PHP's DNA, but I think we can cover a lot more ground with a more general purpose solution that leaves userspace to deal with bigger problems. -Sara
