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To: Rasmus Schultz <rasmus@mindplay.dk>,
 PHP internals <internals@lists.php.net>
References: <CADqTB_i=Sc2fA9O9E2vEFfOrQMTvmwbt2J2CuBJ8OLPLV7kP7Q@mail.gmail.com>
Message-ID: <16eb6670-f65a-a090-e17e-44554ba115be@gmx.de>
Date: Wed, 13 Feb 2019 18:23:25 +0100
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Subject: Re: proper anonymous classes?
From: cmbecker69@gmx.de ("Christoph M. Becker")

On 13.02.2019 at 09:01, Rasmus Schultz wrote:

> The fact that the anonymous class syntax defines a class *and* immediately
> constructs an instance is quite annoying.
> 
> For one, this is quite incompatible with DI containers' ability to resolve
> constructor arguments.
> 
> Lets say you DI container can register a named component by merely
> referencing a class that uses constructor injection - so lets say this
> works:
> 
> class MyController {
>     public function __construct(MyService $service) {
>         // ...
>     }
> }
> 
> $container->register("my-controller", MyController::class);
> 
> Now I want to register an anonymous class, for example as part of an
> integration test-suite, which is common enough:
> 
> $container->register("my-controller", new class {
>     public function __construct(MyService $service) {
>         // ...
>     }
> });
> 
> This doesn't work, because you're expected to actually pass the constructor
> arguments immediately - because you can only define an anonymous class
> while immediately creating an instance.
> 
> What I really want is just an anonymous class - not an instance, so:
> 
> $container->register("my-controller", class {
>     public function __construct(MyService $service) {
>         // ...
>     }
> });
> 
> The question is, what would a class expression without the new keyword
> evaluate to?
> 
> Since we normally reference classes with just a class-name, I guess I'd
> expect a string, like you'd get from the ::class constant.
> 
> Any hope for something like that?

Not particularly efficient, but likely sufficient for the use case:

  $container->register("my-controller", get_class(new class {
      public function __construct(MyService $service) {
          // ...
      }
  }));

-- 
Christoph M. Becker