Array 1:
$VAR1 = [
          '1',
          '2',
          '2',
          '3',
          '3',
          '3',
          '4',
          '4',
          '4',
          '4'
        ];
Array 2:
$VAR1 = [
          '1',
          '2',
          '3',
          '4'
        ];
Array 1 minus Array 2:
$VAR1 = [
          '2',
          '3',
          '3',
          '4',
          '4',
          '4'
        ];
Array 2 minus Array 1:
$VAR1 = [];
Result a:
$VAR1 = [
          '2',
          '3',
          '3',
          '4',
          '4',
          '4'
        ];
----------------------------------------
Array 1:
$VAR1 = [
          'one',
          'one',
          'two'
        ];
Array 2:
$VAR1 = [
          'one',
          'two'
        ];
Array 1 minus Array 2:
$VAR1 = [
          'one'
        ];
Array 2 minus Array 1:
$VAR1 = [];
Result b:
$VAR1 = [
          'one'
        ];
----------------------------------------
Array 1:
$VAR1 = [
          'one',
          'one',
          'two'
        ];
Array 2:
$VAR1 = [
          'one',
          'two',
          'three'
        ];
Array 1 minus Array 2:
$VAR1 = [
          'one'
        ];
Array 2 minus Array 1:
$VAR1 = [
          'three'
        ];
Result c:
$VAR1 = [
          'one',
          'three'
        ];