array(3) {
  [0]=>
  string(9) "Pepperoni"
  [2]=>
  string(9) "Anchovies"
  [3]=>
  string(8) "Tomatoes"
}
array(2) {
  [0]=>
  string(9) "Pepperoni"
  [3]=>
  string(8) "Tomatoes"
}
----------------------------------array(4) {
  [0]=>
  string(6) "Johnny"
  [1]=>
  string(5) "Timmy"
  [2]=>
  string(5) "Bobby"
  [4]=>
  string(5) "Tammy"
}
----------------------------------array(3) {
  ["London"]=>
  string(7) "England"
  ["Edinburgh"]=>
  string(8) "Scotland"
  ["Cardiff"]=>
  string(5) "Wales"
}
----------------------------------array(1) {
  [1]=>
  string(6) "Cheese"
}
Intersect: array(2) {
  ["Ildiko"]=>
  int(38)
  ["Nick"]=>
  int(27)
}
array(1) {
  ["Nick"]=>
  int(27)
}
----------------------------------