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Date: Sat, 5 Jun 2021 16:29:12 +0200
Message-ID: <CAEPJdukoekDUPpjp8rzDpXqYQ2wGTQ-Y=7kHWb=xi8hr6kKAug@mail.gmail.com>
To: Nikita Popov <nikita.ppv@gmail.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="00000000000076996a05c405a21f"
Subject: Re: [PHP-DEV] [RFC] Readonly properties
From: kontakt@beberlei.de (Benjamin Eberlei)

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On Fri, Jun 4, 2021 at 5:20 PM Nikita Popov <nikita.ppv@gmail.com> wrote:

> Hi internals,
>
> I'd like to open the discussion on readonly properties:
> https://wiki.php.net/rfc/readonly_properties_v2
>
> This proposal is similar to the
> https://wiki.php.net/rfc/write_once_properties RFC that has been declined
> previously. One significant difference is that the new RFC limits the scope
> of initializing assignments. I think a key mistake of the previous RFC was
> the confusing "write-once" framing, which is both technically correct and
> quite irrelevant.
>
> Please see the rationale section (
> https://wiki.php.net/rfc/readonly_properties_v2#rationale) for how this
> proposal relates to other RFCs and alternatives.
>

I have a question about Reflection support, the RFC states:

> ReflectionProperty::setValue() can bypass the requirement that
initialization occurs from the scope where the property has been declared.
However, reflection cannot modify a readonly property that has already been
initialized.

Is there a reason why this is not possible? I am thinking about ORMs or
Deserializers here where a pattern would be:

class MyDataObject
{
    public function __construct(
        public readonly $foo
    ) {}
}

$dataObject = $reflectionClass->newInstanceWithoutConstructor();
$dataObject->getProperty('foo')->setValue($row['value']);


>
> Regards,
> Nikita
>

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