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 <802fdb7d-69e5-edfa-de94-70416f9093d0@ralphschindler.com>
In-Reply-To: <802fdb7d-69e5-edfa-de94-70416f9093d0@ralphschindler.com>
Reply-To: Levi Morrison <levi.morrison@datadoghq.com>
Date: Fri, 2 Jul 2021 16:21:14 -0600
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To: Ralph Schindler <ralph@ralphschindler.com>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [VOTE] First-class callable syntax
From: internals@lists.php.net ("Levi Morrison via internals")

On Fri, Jul 2, 2021 at 10:32 AM Ralph Schindler
<ralph@ralphschindler.com> wrote:
>
>
> > This RFC uses a syntax that is forward-compatible with partial function
> > application. Should it not be accepted, I'll explore alternative syntax
> > possibilities.
>
> Given the choice of syntax in this proposal (which I do like)... Is the
> following (potentially future) use case precluded by the syntax (whether
> or not you like it immediately ;) )?
>
> Basically be able to:
>
> 1. be able to refer to an instance method statically (this is currently
> an error)
>
> 2. allow late binding of $this/context/closure scope, either via
> bindTo() or via Reflection setClosureThis() (does not exist)
>
>
>
>    class MyController {
>      public function myAction($name) {
>        return new Response("Hello, $name");
>      }
>    }
>
>    // Closure with no $this (to be filled in later)
>    $fn = MyController->myAction(...);
>
>
>    $controller = new MyController;
>    $response = ($fn->bindTo($controller))($params);

It would theoretically be:

    $fn = MyController::myAction(...);

It currently errors:

> Fatal error: Uncaught Error: Non-static method MyController::myAction() cannot be called statically

I would be okay with allowing this, as long as it's bound before it's called.