<?
$arr[0] = "A";
$arr[1] = "B";
$arr[2] = "C";
$loop_arr = count($arr);
$index = 0;
while($index < $loop_arr)
  {
    echo $arr[$index]."<br />";
    $index++;
  }
?>

A
B
C

<?
$arr[0][0] = "00";
$arr[0][1] = "01";
$arr[0][2] = "02";
$arr[1][0] = "A";
$arr[1][1] = "B";
$arr[1][2] = "C";
$loop_arr = count($arr);
$index = 0;
while($index < $loop_arr)
  {
    $loop_sub = count($arr[$index]);
    $sub = 0;
    while($sub < $loop_sub)
      {
        echo $arr[$index][$sub]."<br />";
        $sub++;
      }
    $index++;
  }
?>

00
01
02
A
B
C