array(2) {
  [0]=>
  string(5) "hello"
  [1]=>
  string(5) "world"
}
helloarray(4) {
  ["name"]=>
  string(3) "Bob"
  ["age"]=>
  string(2) "21"
  ["likes-pizza"]=>
  bool(true)
  ["gender"]=>
  string(4) "Male"
}
<br><br>hello<br>world<br>Key: name   Value: BobKey: age   Value: 21Key: likes-pizza   Value: 1Key: gender   Value: Malearray(2) {
  [0]=>
  array(2) {
    [0]=>
    string(7) "COLUMN1"
    [1]=>
    string(7) "COLUMN2"
  }
  [1]=>
  array(2) {
    [0]=>
    string(3) "Bob"
    [1]=>
    string(5) "JONES"
  }
}
<br><br>Bob<br>Sally<br>Mark<br>Betty<br>$ar6 is an arrayBob<br>Sally<br>Mark<br>Bettyarray(4) {
  [0]=>
  string(3) "Bob"
  [1]=>
  string(6) " Sally"
  [2]=>
  string(5) " Mark"
  [3]=>
  string(6) " Betty"
}
array(2) {
  [0]=>
  array(2) {
    ["firstName"]=>
    string(3) "Bob"
    ["lastName"]=>
    string(5) "Smith"
  }
  [1]=>
  array(2) {
    ["firstName"]=>
    string(5) "Betty"
    ["lastName"]=>
    string(5) "Jones"
  }
}