Array
(
    [0] => Array
        (
        [0] => 2012-02-26 07:15:00
        )
    [1] => Array
        (
            [0] => 2012-02-26 17:45:00
            [1] => 2012-02-26 18:55:00
        )
    [2] => Array
        (
            [0] => 2012-02-26 18:55:00
            [1] => 2012-02-26 17:45:00
        )
    [3] => Array
        (
            [0] => 2012-02-26 18:57:00
            [1] => 2012-02-26 17:45:00
            [2] => 2012-02-26 18:55:00
        )

当我计运算符阵列时,我得到1,2,3.我怎么能在3,1中收到它？我需要得到最后3个具有最高子阵列数的子阵列(DESC,它意味着3,2).我怎样才能做到这一点？