Parameter #1 $callback of function array_map expects (callable(object): mixed)|null, Closure(App\Entity\EntityObject): ArrayObject<int, mixed>|string|false given.

[kdaniel95]

Hey!

So I am new to PHPStan and I came accross a problem using array_map:

Parameter #1 $callback of function array_map expects (callable(object): mixed)|null, Closure(App\Entity\EntityObject): ArrayObject<int, mixed>|string|false given.

I do not know what the exact problem is. Is it that I use Closure instead of callable or that the parameter and return type of my Closure is mismatched?
If the case is the latter, why is it a problem that I pass and return a narrower type? (because object and mixed are a broader type if I understand correctly)

Thanks for the help!

[herndlm]

I had a related thing literally minutes ago. Turned out that I was using string parameter type hints for the callable in the closure but somewhere up added an element to the array mapping from a method that had incorrectly a string|null return type.
So what I want to say - check your array elements and param hints. \PHPStan\dumpType($array); might help you there.

[ondrejmirtes]

If your problem still isn't solved, please post an example with a link to phpstan.org playground.

[celinederoland]

Maybe this could help, I had the problem with an iterable that have a well defined type of elements (T) but a non well defined type of keys (TKey) :

Iterable<type1,type2> ==> OK ; phpstan accepts a callable of type2 as the first argument of array_map
Iterable<TKey,type2> ==> NOT OK ; phpstan expects a callable of mixed as the first argument of array_map ; doesn't accept a collable of type2

https://phpstan.org/r/b4a949e2-3b8a-41cd-9727-f52a1712e924