bool(true)
bool(false)
array(0) {
}
array(1) {
  [0]=>
  NULL
}
Foo: foo 12 bar
array(6) {
  [0]=>
  int(1)
  [1]=>
  int(54)
  [2]=>
  int(3)
  [3]=>
  int(23)
  [4]=>
  int(5)
  [5]=>
  int(2)
}
array(6) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "b"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "d"
  [4]=>
  string(1) "e"
  [5]=>
  string(1) "f"
}
array(6) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(5)
  [4]=>
  int(23)
  [5]=>
  int(54)
}
array(6) {
  [0]=>
  string(1) "a"
  [1]=>
  string(1) "f"
  [2]=>
  string(1) "c"
  [3]=>
  string(1) "e"
  [4]=>
  string(1) "d"
  [5]=>
  string(1) "b"
}
array(6) {
  [0]=>
  int(54)
  [1]=>
  int(23)
  [2]=>
  int(5)
  [3]=>
  int(3)
  [4]=>
  int(2)
  [5]=>
  int(1)
}
array(6) {
  [0]=>
  string(1) "b"
  [1]=>
  string(1) "d"
  [2]=>
  string(1) "e"
  [3]=>
  string(1) "c"
  [4]=>
  string(1) "f"
  [5]=>
  string(1) "a"
}
array(3) {
  [0]=>
  array(3) {
    [0]=>
    int(3)
    [1]=>
    int(2)
    [2]=>
    int(1)
  }
  [1]=>
  array(3) {
    [0]=>
    int(4)
    [1]=>
    int(6)
    [2]=>
    int(5)
  }
  [2]=>
  array(3) {
    [0]=>
    int(7)
    [1]=>
    int(9)
    [2]=>
    int(8)
  }
}