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Date: Thu, 22 Jan 2026 16:33:27 +0100
Message-ID: <CAOWwgp=JtbTSVCv9z=QGx9yS=8G72L-hcAjcOj33eEMLB0zfvg@mail.gmail.com>
Subject: [PHP-DEV] [RFC] Allow Reassignment of Promoted Readonly Properties in Constructor
To: PHP Internals List <internals@lists.php.net>
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From: nicolas.grekas+php@gmail.com (Nicolas Grekas)

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Dear all,

Here is a new RFC for you to consider:
https://wiki.php.net/rfc/promoted_readonly_constructor_reassign

As a quick intro, my motivation for that RFC is that I find it quite
annoying that readonly properties play badly with CPP (constructor property
promotion).

Doing simple processing of any argument before assigning it to a readonly
property forces opting out of CPP.

This RFC would allow setting once a readonly property in the body of a
constructor after the property was previously (and implicitly) set using
CPP.

This allows keeping property declarations in their compact form while still
enabling validation, normalization, or conditional initialization.

Cheers,
Nicolas

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<div dir=3D"ltr"><div>Dear all,</div><div><br></div><div>Here is a=C2=A0new=
 RFC for you to consider:</div><div><a href=3D"https://wiki.php.net/rfc/pro=
moted_readonly_constructor_reassign">https://wiki.php.net/rfc/promoted_read=
only_constructor_reassign</a></div><div><br></div><div>As a quick intro, my=
 motivation for that RFC is that I find it quite annoying that readonly pro=
perties play badly with CPP (constructor property promotion).</div><div><br=
>Doing simple processing of any argument before assigning it to a readonly =
property forces opting out of CPP.<br><br>This RFC would allow setting once=
 a readonly property in the body of a constructor after the property was pr=
eviously (and implicitly) set using CPP.<br><br></div>This allows keeping p=
roperty declarations in their compact form while still enabling validation,=
 normalization, or conditional initialization.<br><br><div>Cheers,</div><di=
v>Nicolas</div></div>

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