expects callable(): mixed, array{object, non-empty-string} given

[zer0uno]

I have the following method:

public function addSubscriber(object $object): void
{
    $reflectionClass = new ReflectionClass($object);

    foreach ($reflectionClass->getMethods(ReflectionMethod::IS_PUBLIC) as $reflectionMethod) {
        $reflectionAttributes = $reflectionMethod->getAttributes(ListensTo::class);
        
        foreach ($reflectionAttributes as $reflectionAttribute) {
            $listensToAttribute = $reflectionAttribute->newInstance();
            
            $this->eventDispatcher->addListener(
                $listensToAttribute->getEventType(),
                [$object, $reflectionMethod->getName()]
            );
        }
    }
}

When I execute PHPStan I get the following error:

Parameter #2 $listener of method Cota\ScrApp\Event\EventDispatcher\EventDispatcherInterface::addListener() expects callable(): mixed, array{object, non-empty-string} given.

I can't figure out of [$object, $reflectionMethod->getName()] cannot be a callable as I'm fetching only public methods from the $object object.

[ondrejmirtes]

Please reproduce this on phpstan.org/try and I'll show you how to fix it.

[ondrejmirtes]

Do this: https://phpstan.org/r/04e43058-fda7-4e8d-b2d0-3422e6f9492e

Or this: https://phpstan.org/r/b6c99a4a-294c-4942-9005-2e0938af9625 (I really like that one)

[zer0uno]

@ondrejmirtes About the first solution, why should I use is_callable()? I mean [$object, $reflectionMethod->getName()] is of course a callable... I don't like the idea to add code not intended for my business logics, I don't know if you get my point

[ondrejmirtes]

PHPStan's type system does not understand that.

[zer0uno]

@ondrejmirtes can you argument a little bit the second solution? To be honest I didn't understand it quite well. I tried to execute it here https://onlinephp.io/c/d764b but it doesn't work

[ondrejmirtes]

Yeah I'm sorry, I misremembered how it works. You'd have to do something like this https://phpstan.org/r/dc905ea9-23ad-453b-86cf-f807bc6a1898.