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Date: Mon, 27 Jan 2020 14:20:13 -0500
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To: Larry Garfield <larry@garfieldtech.com>,
 Nikita Popov <nikita.ppv@gmail.com>
Subject: Re: [PHP-DEV] [RFC] Adding a "Stringable" interface to PHP 8
From: mike@newclarity.net (Mike Schinkel)

> On Jan 27, 2020, at 10:55 AM, Larry Garfield <larry@garfieldtech.com> =
wrote:
>=20
> On Mon, Jan 27, 2020, at 10:19 AM, Nikita Popov wrote:
>> Automatically implementing interfaces based on implemented methods =
could
>> also be a general language feature (see Go interfaces for example), =
but
>> likely not one we're interested in having in it's full generality. In =
this
>> particular case, it seems useful though.
>>=20
>> Regards,
>> Nikita
>=20
> I believe Anthony Ferrara proposed "Weak interfaces" once many years =
ago, which is essentially what you're describing.  It didn't get much =
traction although I'm unclear why.  (Possibly just less familiarity with =
Go at the time?)
>=20
> I agree not all interfaces should be implicit, but having =
implicitly-implementable interfaces does sound generally useful.  That =
shouldn't block this RFC, but might this RFC be a model for how to =
implement such things more generically in the future?
>=20
> --Larry Garfield

Glad to see you picked up on this Larry.

I don't think "Weak Interfaces" became an RFC unless Google is failing =
me, but I found a reference to it being on the mailing list from =
Matthieu Napoli's article on GitHub about decoupling, which is worth a =
read:

=
https://github.com/mnapoli/mnapoli.github.io/blob/master/articles/decoupli=
ng-packages.md

As far as Go's implicit interfaces, I have found that to be one of the =
most compelling language features of Go, and would be ecstatic if we =
could find a way to support implicit interfaces in PHP.

-Mike