//陣列排列組合：array(array(1,2,3),array('a','b','c','d'),array('白色','黑色'))
function combination_arr($arrs) {

  $num = 1;
  foreach ($arrs as $k=>$v) {
    $num *= count($v);
  }

  $arr_num = $num;
  foreach ($arrs as $key=>$v_list) {

    $v_num = count($v_list);
    //$v_list中的元素在排列組合中出現的最大重複次數
    $arr_num = $arr_num / $v_num;
    $position = 0;
    // 開始對$v_list進行迴圈
    foreach($v_list as $v)
    {
      $v_position = $position;
      $count = $num / $v_num / $arr_num;
      for($j = 1; $j <= $count; $j ++)
      {
        for($i = 0; $i < $arr_num; $i ++)
        {
          $result[$v_position + $i][$key] = $v;
        }
        $v_position += $arr_num * $v_num;
      }
      $position += $arr_num;
    }
  }

  return $result;
}