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Date: Mon, 24 Jun 2024 14:53:12 +0700
Message-ID: <CANLbj-qvn-BFfN8hEQRciUuT_qCiiPfyqc=YiL1Pw5+Oy-Ad4Q@mail.gmail.com>
Subject: Re: [PHP-DEV] [RFC] Static class
To: Bilge <bilge@scriptfusion.com>
Cc: php internals <internals@lists.php.net>
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From: ayesh@php.watch (Ayesh Karunaratne)

>
> This work is based on the previous discussion thread on this list of the
> same name, and hopefully captured all the relevant details,
> notwithstanding anything unanticipated that may present itself during
> the implementation. Let me know if you feel anything important has been
> missed. I am aware it omits to mention specifics about messages so
> emitted when runtime or compile-time errors occur, but I anticipate this
> can be hashed out in the PR, unless consensus indicates otherwise.


Hi Bilge,
I was reading the mailing list discussions, and I am glad you created the RFC.

Personally, I think this will be a useful feature. Just like we have
`readonly` properties and `readonly` classes, I don't see why we can't
have static methods. I also saw in the draft PR that it does not
require a lot of changes to the engine to have this.

I'd like to propose to add some more information and points addressed
in the RFC. This is of course merely a suggestion, but it's something
I was thinking when reading the RFC.

 - Why is it a class-level flag and not an attribute (similar to the
`#[Override]` attribute in PHP 8.3) ?
 - Can a subclass extend a static parent class without using the
`static` keyword in the subclass? This will avoid a lot of BC issues
if a library decides to declare classes as static.
 - Are there any opt-out mechanisms for subclasses?
 - Can you mark interfaces, abstract classes, and Enums as static?