array(
  [0]=>array(
          [0]=>aaaa
          [1]=>aaaa
          [2]=>aaaa
             )
  [1]=>array(
          [0]=>bbb
          [1]=>bbb
          [2]=>bbb
             )  [3]=>array(
          [0]=>ccc
          [1]=>ccc
          [2]=>ccc
             ))最终数组倒序排序  形成  [3]=>cccc  [2]=>cccc [1]=>cccc