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Date: Fri, 23 Jan 2026 14:13:58 +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 2026-01-23 14:06, schrieb Mathieu Rochette:
> `(DateTimeImmutable)?->format("c")` feels a bit weird. Reminds me too 
> much of the null-safe operator.

That's because it is. It's literally the same case of a 
`DateTimeImmutable` constant with useless parentheses and the null-safe 
object member access: https://3v4l.org/NebOR#veol

> They could have incompatible signatures, yes, but they also could have 
> compatible ones too. It's not a deal breaker. I don't imagine needing 
> this in practice. But I don't see why the language would prevent that; 
> I can already make that mistake with short closures or any methods. For 
> me, it's the role of the static analyzer to tell me if I made such a 
> mistake (or runtime errors ^^).

The signature would need to be “unique” to properly generate the 
signature of the resulting Closure.

Best regards
Tim Düsterhus