hhvm/hphp/test/quick/array_callbacks.php.expect

array(4) {
  [0]=>
  int(1)
  [2]=>
  int(3)
  [4]=>
  int(5)
  [6]=>
  int(7)
}
8 times
array(6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [6]=>
  int(7)
  [7]=>
  int(8)
}
8 times