The input fiter "ArrayInput" needs some explanations and code examples.
https://github.com/laminas/laminas-inputfilter/blob/2.11.x/src/ArrayInput.php
This is the old issue from here zendframework/zf2-documentation#936 .
I was trying to find documentation about ArrayInput here https://docs.laminas.dev/laminas-inputfilter/ using searchbar but no results.