Refine return type of preg_filter()

[arnaud-lb]

Feature request

preg_filter() can return a string or an array of string depending on the type of its 3rd parameter.

It would be useful to refine the return type based on the 3rd parameter.

https://phpstan.org/r/43423551-a7d4-42fa-98ec-44a484c355af

[staabm]

on it..

I think the expected value for PHPStan\Testing\assertType('array|null', preg_filter(['#foo#'], ['bar'], ['subject'])); within the snippet is wrong, as preg_filter will not return null when $subject is a array

[github-actions]

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