Argument $abstract to Container::resolve?

[ptomulik]

Hi, I'm trying to understand some internals of Laravel Container. I've seen, the parameter $abstract to Container::resolve as well as Container::make is declared to be string|callable.

What's the use of callable there? Is it intentional? The $abstract is used within resolve() as a key to access array items. I guess, this is not supposed to work (supposedly, it will result with Fatal error: Illegal offset type).

So my question is: is this callable intentional, or it's there just by accident?

[henzeb]

It is for the bindings that use closures to build up concrete classes. the resolve method sees this as buildable and will execute that closure first before building up the concrete class.

See: https://laravel.com/docs/9.x/container#simple-bindings

[ptomulik]

Thank you for the answer. I'm still wondering how it's supposed to work. I've tried to use it with a closure and it doesn't seem to work. Note, that binding a callable doesn't mean it's passed to resolve/make. I made a simple experiment with the make (it just passes arguments to resolve) using psysh:

> namespace Illuminate\Container;
> $container = new Container();
> $e = $container->make(\Exception::class);
= Exception {#2734
    #file: "/home/ptomulik/sources/laravel-framework/src/Illuminate/Container/Container.php",
    #line: 929,
  }
> $container->make(function ($app) { return new \Exception(); });

    TypeError  Illegal offset type in isset or empty.

The type error is (probably) thrown from here