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Date: Tue, 24 Mar 2026 18:48:22 +0000
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Subject: =?US-ASCII?Q?Re=3A_=5BPHP-DEV=5D_=5BVOTE=5D_Allow_Reassignment_of_?=
 =?US-ASCII?Q?Promoted_Readonly_Properties_in_Constructor?=
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From: imsop.php@rwec.co.uk ("Rowan Tommins [IMSoP]")

On 24 March 2026 14:06:53 GMT, "Micha=C5=82 Marcin Brzuchalski" <michal=2Eb=
rzuchalski@gmail=2Ecom> wrote:
>So while I understand the motivation behind the RFC, I think this moves
>readonly further toward special-case behavior, when it would be better to
>keep it strict and predictable=2E

I agree with Ilija and Michal here=2E I can see why this might seem useful=
, but the detailed rules feel very complicated, weakening the value of "rea=
donly"=2E

I think it also weakens the premise of CPP, which was to merge *three* pie=
ces of code: the property declaration, the parameter declaration, and the a=
ssignment=2E

Perhaps what's actually needed is a variant that only merges the *assignme=
nt* with the property declaration? That would then cover the case mentioned=
 in the RFC with a change in type, as well as the "readonly" case:

```
class Config {
    public function __construct(
        ?string $cacheDir =3D null,
    ) {
        public readonly string $this->cacheDir =3D $cacheDir ?? sys_get_te=
mp_dir() =2E '/app_cache';
    }
}
```

I'm not sure I love it, but it feels more consistent with the intention of=
 both CPP and readonly=2E=20

Regards,

Rowan Tommins
[IMSoP]