On Sun, 25 Apr 2021 at 16:12, David Rodrigues <david.pro...@gmail.com>
wrote:
> I know that this discussion comes back from time to time, but now that PHP
> is quite strong in relation to argument typing, I think it is worthwhile to
> have a quick discussion about it. Maybe to PHP 9.
>
> One of the things I remember that was a big problem was the performance
> impact in determining what the ideal method would be, without testing it
> each time.
>
> 1. The test only needs to happen for overloaded methods. So, most of the
> time, no change will occur.
>
> 2. Opcache may be able to help indicate which method will be executed, when
> it is available. And perhaps, in some situations, it is possible to
> determine which method will be tested as a priority, without having to test
> all the time (in a loop, for example).
>
> function printId(User $user) { return a($user->id); }
> function printId(int $userId) { printf($userId); }
>
> foreach ([1, 2, 3, 4, $userInstance] as $userId) {
> printId($userId);
> // First time:
> // 1. Overload detected, but the best option is unknown;
> // 2. Test option #1: rejected;
> // 3. Test option #2: accepted and used;
> // Next times:
> // 1. Overload detected, the last occurrence was option #2, accepted
> and used;
> // 2. Option #2 can't be used for $userInstance, retest all options
> (except #2).
> }
>
> 3. Poorly typed functions or methods cannot be overloaded.
>
> function printId(User $user) { ... }
> function printId($user) { ... } // Fatal error
>
>
> Atenciosamente,
> David Rodrigues
>
This was brought up four years ago (https://externals.io/message/93831) and
you brought this up two years ago, but I don't think anything has changed
to change the answer.
The responses in the four-years-ago post contain some good explanations.
Unless you have a draft implementation that fixes the issues mentioned I'm
not sure it's productive to bring it up again.
Best wishes,
Matt
