0 1
1 2
2 3
array(4) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(400)
}
array(4) {
  [0]=>
  string(4) "fub1"
  [1]=>
  string(4) "fub2"
  [2]=>
  string(4) "fub3"
  [3]=>
  string(6) "fub400"
}