Standard PHP function are not checked if array and callback type matches - support generics in functionMap

[olsavmic]

Feature request

Hi,
I was surprised to find out that PHPStan does not support checking if types match in case of native function like array_map/array_filter and similar.

https://phpstan.org/r/d7ff2afa-6d0a-436f-9011-dee78f6d994e#

I suppose that's due to the fact that the functionMap.php does not support generics or at least the generic types are not specified.

I would really appreciate if it could be done at least for some of the most used methods as it gives a false sense of security now with runtime error :)

Do you think it is possible to add support for something like this in the future?

Thanks a lot!

[ondrejmirtes]

Duplicate of: #1954

Support for stub files overriding internal functions could be added, but array_map and array_filter have a lot of special handling in the core already, and I worry that generics would clash with that so there needs to be special care applied during the implementation.

One example of such special handling is: https://phpstan.org/r/a9f6a271-8f4d-4dee-b1ce-8a82cabdc51e

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