PHP Hash Recursion & Order

hash_recursion_order.php

<?php
//recursion
$arr=array(1,2,3,4,5,);
$arr[]=&$arr;
var_dump($arr);
printf("<br>");

$ar[2]='aaaaa';
$ar[1]=2007;
$ar[0]=2008;
foreach($ar as $key=>$val){
  var_dump($key);
  var_dump($val);
  printf("<br>");
}

array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> &array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> RECURSION } }

int(2) string(5) "aaaaa" 
int(1) int(2007) 
int(0) int(2008)