Yes, you can do this in one function, but you’ll still need to do some hard coding. Your sub field keys are different.
The 3rd argument to your filter is $field. This contains all the information on the current field being validated. You could check $field[‘key’] to see what field is being validated and then set your other values based on that check.
While combining the validation filters will reduce some of the duplication of code it will also mean that you’ll need to add additional code to deal with the differences of each field. Where on the other hand, creating a different filter for each field means that you don’t need to worry about those differences.
