Multi Sort

<?
//sort by second column then first one
$orderBy=array('0'=>'asc', '1'=>'asc');
 
function KES_cmp($a, $b) {
  global $orderBy;
  $result= 0;
  foreach( $orderBy as $key => $value ) {
    if( $a[$key] == $b[$key] ) continue;
    $result= ($a[$key] < $b[$key])? -1 : 1;
    if( $value=='desc' ) $result= -$result;
    break;
    }
  return $result;
  }
 
$result= array();
$result[]= array( 'first'=>6, 2);
$result[]= array( 'first'=>3, 2);
$result[]= array( 'first'=>1, 3);
$result[]= array( 'first'=>1, 2);
$result[]= array( 'first'=>6, 1);
 
print "</br<b>Source</b></br>";
print_r($result);
 
usort($result, 'KES_cmp');
print "</br<b>Result</b></br>";
print_r($result);
?>