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Date: Thu, 6 Jan 2022 19:36:41 +0200
Message-ID: <CAAwdEzDNBdBPLqN4gjzWMxGMPs88WV=fXKNu=5LBoXuhj3UVLw@mail.gmail.com>
To: Rowan Tommins <rowan.collins@gmail.com>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] RFC: Trait expects interface
From: drealecs@gmail.com (=?UTF-8?Q?Alexandru_P=C4=83tr=C4=83nescu?=)

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On Thu, Jan 6, 2022 at 7:12 PM Rowan Tommins <rowan.collins@gmail.com>
wrote:

>
> But some comments seem to be hinting at some *separate* advantage, to do
> with "correct usage" of the trait, which I haven't grasped. It's possible
> that the mention of static analysis relates to that in some way, and I'm
> just completely missing the point.
>

Yes, traits are a language construct that has in general more negative
implications than positive so it's good to keep an eye on their usage.
One of the okish usages is to define some implementation for an interface
that classes can use.
Limiting that trait to be used only by classes implementing the interface
is seen as a restriction placed on the trait that would not allow it to be
used in other places when it might have a negative impact.

Just as a note, on the composition vs inheritance line, I see traits
somewhere in the middle.
I'll always prefer to go for full composition, even if that means a bit
more boilerplate. The implementation can very well sit in a class and have
it as a dependency of the class that needs it.

Alex

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