Check filter_input* type param type

[herndlm]

Specifying invalid ints there fails with a fatal error since PHP 8, see https://3v4l.org/2QvBP and https://3v4l.org/EP3T8
It would also be wrong on pre PHP 8 but there's no fatal error there at least.

This is the easiest I could come up with to check this, but it feels a bit weird. Any better ideas?

See also https://www.php.net/manual/en/function.filter-input.php and https://www.php.net/manual/en/function.filter-input-array.php
The 2 failing tests seem unrelated.

Some special handling based on PHP version could also be additionally built into e.g. #2010 (which can be merged I believe ;))

[ondrejmirtes]

Although it makes the code safer, it can be quite annoying to require users to write a more specific PHPDoc type in their @param.

We need to figure out a way how to do these changes only in bleedingEdge. Then we'd also be albe to merge this #2163 and this #2217.

[staabm]

We need to figure out a way how to do these changes only in bleedingEdge

what do you think about enabling these errors/use more precise signatures only when bleedingEdge and strict-rules are enabled?

[herndlm]

makes sense, thx for the inputs! I thought here it might be okay, because nobody ever should call these functions differently. I think it's a bit different compared to the linked PRs, but I get the general problem and point :)

[phpstan-bot]

This pull request has been marked as ready for review.

[ondrejmirtes]

Thank you!