Fix https://github.com/kixe/FieldtypeSelectExtOption/issues/19

[tiefenb]

Replaced each('value') with Manual Loops:
For both $value and $_value, if they are instances of SelectExtOptionArray, we iterate over each item and collect the value property into $array1 or $array2.

Handled Different Value Types:
Properly checks if $value is a SelectExtOption, SelectExtOptionArray, array, or numeric, and processes each case to build $array1 and $int1 accordingly.

This approach ensures that we're working with plain PHP arrays, preventing the type error when using array_values().

[kixe]

SelectExtOptionArray::each('SelectExtOptionProperty') should always return a PHP array. I can't see any case where this function returns an object of type SelectExtOptionArray. Maybe you are using a different version or modified code, as the error also marks a different line in the code, as I had mentioned here before: #19 (comment) Thanks for helping to understand the issue.

[tiefenb]

I don't know - I upgraded from Version 2.1.3 to 2.2.0. The only modified code I'm using in our version is const OPTIONSLIMIT = 2000;