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Wed, 14 Jan 2026 22:36:15 -0800 (PST) Precedence: list list-help: list-unsubscribe: list-post: List-Id: x-ms-reactions: disallow MIME-Version: 1.0 Date: Thu, 15 Jan 2026 10:36:03 +0400 X-Gm-Features: AZwV_QgVJtZF3CTmCxj-cBRiSdEL8z_4seb7E5DrPdaJSBEWaVS99ES_3K0UkV4 Message-ID: Subject: [PHP-DEV] [php-src] PR #20903: GH-10497 (const obj->prop write) - language change notes To: PHP internals Content-Type: multipart/alternative; boundary="00000000000006358a064867719b" From: khaledalam.net@gmail.com (Khaled Alam) --00000000000006358a064867719b Content-Type: text/plain; charset="UTF-8" Hi internals, I opened PR #20903 to address GH-10497 by allowing writes to properties of objects referenced by consts (const binding stays immutable, referenced objects can be mutable). class C { public int $x = 0; } const OBJ = new C(); OBJ->x = 1; // currently rejected, PR makes it valid var_dump(OBJ->x); // 1 Notes: - This is a language/semantics change and may overlap with / impact GH-13800 . - A potentially surprising case: some newly-valid writes can be a no-op when they target a temporary const value, e.g. - const X = [1,2,3]; X[] = 4; - const Y = ['a' => 1]; Y['b'] = 2; These become valid syntax but have no effect because the write happens on a temporary basis. Feedback on semantics + expected behavior for the temporary-write case is appreciated. Thanks, __ *Khaled Alam* --00000000000006358a064867719b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi internals,

I opened PR #20903 to address GH-10497 by allowing writes to prop= erties of objects referenced by consts (const binding stays immutable, refe= renced objects can be mutable).

class C { public int $x = =3D 0; } const OBJ =3D new C(); OBJ->x =3D 1; =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 // currently rejected, PR makes i= t valid var_dump(OBJ->x);=C2=A0 =C2= =A0 // 1

Notes:

<= /font>

  • This is a language/semantics chan= ge and may overlap with / impact GH-13800.

  • A potent= ially surprising case: some newly-valid writes can be a no-op when they tar= get a temporary const value, e.g.

    • const X =3D [1,2,3];=C2=A0 X[] =3D 4;
      • <= li>const Y =3D ['a= 9; =3D> 1];=C2=A0 Y['b'] =3D 2;
These becom= e valid syntax but have no effect because the write happens on a temporary = basis.

Feedback on semantics + expected beh= avior for the temporary-write case is appreciated.

Thanks,

__

Khaled Alam

<= /div>
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