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Date: Tue, 17 Mar 2026 19:59:06 +0100
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Subject: [PHP-DEV] Re: [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.
>>
>
>
> Friendly reminder about this RFC. It's been quiet for 13 days so I plan to
> start the vote on Thursday if there are no more concerns to the text of the
> proposal.
>

I made some changes last week based on Ilia's review. Nothing substantial,
just clarifications, and removal of the implementation notes, which don't
belong to the RFC text.
Here is the diff FYI:
https://wiki.php.net/rfc/promoted_readonly_constructor_reassign?do=diff&rev2%5B0%5D=1771972248&rev2%5B1%5D=1773345559&difftype=sidebyside

This postpones the vote by 7 days, I'll open it next week, unless the
discussion continues of course!

Cheers,
Nicolas

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<div dir=3D"ltr"><div dir=3D"ltr">Dear all,</div><br><div class=3D"gmail_qu=
ote gmail_quote_container"><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"ltr"><div class=3D"gmail_quote"><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex"><div dir=3D"ltr"><div>Here is a=C2=A0new RFC for you t=
o consider:</div><div><a href=3D"https://wiki.php.net/rfc/promoted_readonly=
_constructor_reassign" target=3D"_blank">https://wiki.php.net/rfc/promoted_=
readonly_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=
 properties play badly with CPP (constructor property promotion).</div><div=
><br>Doing simple processing of any argument before assigning it to a reado=
nly 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 wa=
s previously (and implicitly) set using CPP.<br><br></div>This allows keepi=
ng property declarations in their compact form while still enabling validat=
ion, normalization, or conditional initialization.<br></div></blockquote><d=
iv><br></div><div><br></div><div>Friendly reminder about this RFC. It&#39;s=
 been quiet for 13 days so I plan to start the vote on Thursday if there ar=
e no more concerns to the text of the proposal.</div></div></div></blockquo=
te><div><br></div><div>I made some changes last week based on Ilia&#39;s re=
view. Nothing substantial, just clarifications, and removal of the implemen=
tation notes, which don&#39;t belong to the RFC text.</div><div>Here is the=
 diff FYI:</div><div><a href=3D"https://wiki.php.net/rfc/promoted_readonly_=
constructor_reassign?do=3Ddiff&amp;rev2%5B0%5D=3D1771972248&amp;rev2%5B1%5D=
=3D1773345559&amp;difftype=3Dsidebyside">https://wiki.php.net/rfc/promoted_=
readonly_constructor_reassign?do=3Ddiff&amp;rev2%5B0%5D=3D1771972248&amp;re=
v2%5B1%5D=3D1773345559&amp;difftype=3Dsidebyside</a></div><div><br></div><d=
iv>This postpones the vote by 7 days, I&#39;ll open it next week,=C2=A0unle=
ss the discussion continues of course!</div><div><br></div><div>Cheers,</di=
v><div>Nicolas</div><div><br></div></div></div>

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