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Date: Sun, 29 Mar 2026 23:42:48 +0200
Message-ID: <CABE7Eu8wTLhVD4+xfcK-ZB10on5cRszKuWSaM45ncVBkBO99iw@mail.gmail.com>
Subject: [PHP-DEV] RFC proposal: Invokable interface
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From: aldemeery@gmail.com (Osama Aldemeery)

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Hi all,

I'd like to propose an Invokable interface, the Stringable equivalent for
__invoke().

The idea has come up a few times over the years (most recently in the PR
#15492 discussion, where Gina suggested this exact approach) but never had
a concrete implementation.

I've put one together: https://github.com/php/php-src/pull/21574

It follows the Stringable pattern: auto-implemented for any class defining
__invoke(), explicitly implementable with enforcement, and covariant to
callable in return type checks.

I'm working on a formal RFC and would love feedback before posting it.

I'd also like to request wiki karma to create the RFC page =E2=80=94 my wik=
i
username is *aldemeery*.

Thanks,

Osama Aldemeery

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<div dir=3D"ltr">Hi all,<br><br>I&#39;d like to propose an Invokable interf=
ace, the Stringable equivalent for __invoke().<br><br>The idea has come up =
a few times over the years (most recently in the PR #15492 discussion, wher=
e Gina suggested this exact approach) but never had a concrete implementati=
on.<br><br>I&#39;ve put one together:=C2=A0<a href=3D"https://github.com/ph=
p/php-src/pull/21574" target=3D"_blank">https://github.com/php/php-src/pull=
/21574</a><br><br>It follows the Stringable pattern: auto-implemented for a=
ny class defining __invoke(), explicitly implementable with enforcement, an=
d covariant to callable in return type checks.<br><br>I&#39;m working on a =
formal RFC and would love feedback before posting it.<br><br>I&#39;d also l=
ike to request wiki karma to create the RFC page =E2=80=94 my wiki username=
 is=C2=A0<b>aldemeery</b>.<br><br>Thanks,<br><br>Osama Aldemeery</div>

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