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Date: Fri, 23 Jan 2026 09:37:39 +0100
To: Mathieu Rochette <mathieu@rochette.cc>
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: tim@bastelstu.be (=?UTF-8?Q?Tim_D=C3=BCsterhus?=)

Hi

Am 2026-01-22 18:30, schrieb Mathieu Rochette:
> I often whished something like this existed :) Didn't get trough to 
> suggest it because I wasn't sure of the syntax either (and lazyness)

Thank you for participating in the discussion of *this* RFC then. Having 
more voices available helps building things that suit the community best 
:-)

> still, my syntax suggestions:
> 
>     array_map(DateTimeImmutable->format("c"), $dates);

Unfortunately this doesn't work, because it is a already-legal method 
call on a method stored in the constant called `DateTimeImmutable`. See: 
https://3v4l.org/3khkT#veol

> 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

Union types would likely be unsupported either way, since multiple 
members of the union could have incompatible signatures for the same 
method. Interfaces are fully supported with the currently proposed 
syntax (it's explicitly mentioned in the RFC).

Best regards
Tim Düsterhus