Sort two-dimensional array

/* http://stackoverflow.com/a/4230273 (see accepted answer too!) */
/* PHP 5.3 required */

/*
Can use multiple arguments, for example: sort_multi_array($my_array, 'column_1', 'column_2');
*/

function sort_multi_array($array, $key)
{
  $keys = array();
  for ($i=1;$i<func_num_args();$i++) {
    $keys[$i-1] = func_get_arg($i);
  }

  // create a custom search function to pass to usort
  $func = function ($a, $b) use ($keys) {
    for ($i=0;$i<count($keys);$i++) {
      if ($a[$keys[$i]] != $b[$keys[$i]]) {
        return ($a[$keys[$i]] < $b[$keys[$i]]) ? -1 : 1;
      }
    }
    return 0;
  };

  usort($array, $func); // use uasort() to maintain index association

  return $array;
}