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Date: Wed, 15 Jun 2022 20:04:18 +0300
Message-ID: <CAAwdEzDAV3FtByKDXiJhr7UV5geCZT245vWMof=Th5jRD5yTPg@mail.gmail.com>
To: Ilija Tovilo <tovilo.ilija@gmail.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="000000000000f8ab4f05e17f8383"
Subject: Re: [PHP-DEV] [RFC][Under discussion] Fetch properties in const expressions
From: drealecs@gmail.com (=?UTF-8?Q?Alexandru_P=C4=83tr=C4=83nescu?=)

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On Wed, Jun 15, 2022 at 6:59 PM Ilija Tovilo <tovilo.ilija@gmail.com> wrote:

> Hi
>
> > Just a question.
> > Would this also be allowed?
> >
> > https://3v4l.org/RGdIA
> > <?php
> >
> > class A {public int $i = 42;}
> > const BARE_CONSTANT = new A;
> > class B {
> >     const ClassConstant = BARE_CONSTANT;
> > }
> > class C {
> >     const ClassConstantViaPropertyFetching1 = BARE_CONSTANT->i;
> >     const ClassConstantViaPropertyFetching2 = B::ClassConstant->i;
> > }
>
> Yes, that would work fine.
>
> Ilija
>
>
Hey, sorry to bump here on this topic.

My assumption was that the use of `->` in initializers would bear the same
limitations as using `new`.
That would mean it would not be supported for
- class constant initializers
- instance property initializers
- static property initializers

For `new` clarifications are here:
https://wiki.php.net/rfc/new_in_initializers#unsupported_positions

My assumption is that `->` would only work for:
- static variable initializers
- global constant initializers
- parameter default values
- attribute arguments

The examples shared by Shinji are for class constant initializers in class
C and I'm guessing it would not work.
If that's the case, I think we should clarify this in the RFC as well.

Regards,
Alex

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