问题
Array ( [0] => 12w12 [1] => 13w12 [2] => 14w12 [3] => 15w12 [4] => 2w13 [5] => 3w13 [6] => 4w13 [7] => 3w12 [8] => 7w12 [9] => 9w12 )
答案应该是
Array ( [0] => 3w12 [1] => 7w12 [2] => 9w12 [3] => 12w12 [4] => 13w12 [5] => 14w12 [6] => 15w12 [7] => 2w13 [8] => 3w13 [9] =>4w13 )