Before:<br>array(5) {
  [0]=>
  int(520)
  [1]=>
  string(2) "33"
  [2]=>
  int(9)
  [3]=>
  string(3) "199"
  ["zero"]=>
  int(1234)
}
<br><br>After sort numeric:<br>array(5) {
  [0]=>
  int(9)
  [1]=>
  string(2) "33"
  [2]=>
  string(3) "199"
  [3]=>
  int(520)
  [4]=>
  int(1234)
}
<br><br>After sort string:<br>array(5) {
  [0]=>
  int(1234)
  [1]=>
  string(3) "199"
  [2]=>
  string(2) "33"
  [3]=>
  int(520)
  [4]=>
  int(9)
}
<br><br>After sort regular (default using relational operators):<br>array(5) {
  [0]=>
  int(9)
  [1]=>
  string(2) "33"
  [2]=>
  string(3) "199"
  [3]=>
  int(520)
  [4]=>
  int(1234)
}