Description:
------------
array_multisort() will not sort static variables.

Reproduce code:
---------------
function sort_test() {
  static $data = NULL;
  if (!isset($data)) {
    $data[] = array('volume' => 67, 'edition' => 2);
    $data[] = array('volume' => 86, 'edition' => 1);
    $data[] = array('volume' => 85, 'edition' => 6);
    $data[] = array('volume' => 98, 'edition' => 2);
    $data[] = array('volume' => 86, 'edition' => 6);
    $data[] = array('volume' => 67, 'edition' => 7);
    foreach ($data as $key => $row) {
      $volume[$key]  = $row['volume'];
      $edition[$key] = $row['edition'];
    }
    array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);
  }
  return $data;
}

Expected result:
----------------
array(
  0 => array('volume' => 98, 'edition' => 2),
  1 => array('volume' => 86, 'edition' => 1),
  2 => array('volume' => 86, 'edition' => 6),
  3 => array('volume' => 85, 'edition' => 6),
  4 => array('volume' => 67, 'edition' => 7),
  5 => array('volume' => 67, 'edition' => 2),
)

Actual result:
--------------
array(
  0 => array('volume' => 67, 'edition' => 2),
  1 => array('volume' => 86, 'edition' => 1),
  2 => array('volume' => 85, 'edition' => 6),
  3 => array('volume' => 98, 'edition' => 2),
  4 => array('volume' => 86, 'edition' => 6),
  5 => array('volume' => 67, 'edition' => 7),
)