Newsgroups: php.internals
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Date: Thu, 22 Jan 2026 17:30:03 +0000
To: =?utf-8?Q?Tim_D=C3=BCsterhus?= <tim@bastelstu.be>
Cc: php internals <internals@lists.php.net>, Arnaud Le Blanc <arnaud.lb@gmail.com>
Subject: Re: [PHP-DEV] [RFC] Partial Function Application for instance of non-static methods ("$this")
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From: mathieu@rochette.cc (Mathieu Rochette)

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On Thursday, January 22nd, 2026 at 10:52, Tim D=C3=BCsterhus <tim@bastelst=
u.be> wrote:

> Hi
> =


> Arnaud and I would like to start discussion on our RFC =E2=80=9CPartial =
Function
> Application for instance of non-static methods ("$this")=E2=80=9D which =
is
> intended to round-off the Partial Function Application RFC that was
> accepted recently:
> =


> https://wiki.php.net/rfc/partial_function_application_this
> =



Hi!

I often whished something like this existed :) Didn't get trough to sugges=
t it because I wasn't sure of the syntax either (and lazyness)

still, my syntax suggestions:

    array_map(DateTimeImmutable->format("c"), $dates);

I understand this doesn't allow reordeing though, but it feels so much bet=
ter and I expect would be what's needed for most cases that I hope somethi=
ng like this could work.

and an opt-in mechanic to reorder could be introduced for that use case. t=
he previous suggestion could be a shortcut for:

    array_map(?::DateTimeImmutable->format("c"), $dates);

and a separate improvement to PFA could add support for picking arguments =
by name or position:

    array_find(?key::SomeObject->hasMatchingValue(?), $array);
    array_find(?2::SomeObject->hasMatchingValue(?), $array);


I noticed `?->method(?)` was considered; evne if it was possible, I would =
prefer if the type was explict, as you may want to use an interface name (=
or a union type, etc.) too

regards,


Mathieu Rochette


> Best regards
> Tim D=C3=BCsterhus
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