请教上面的是什么数据格式？用PHP如何避免？多谢

Array
(
    [2] => Array
        (
            [df] => 0
            [da] => 1
        )

    [22] => Array
        (
            [df] => 1
            [da] => 1
        )

    [18] => Array
        (
            [df] => 0
            [da] => 1
        )

    [130] => Array
        (
            [df] => 0
            [da] => 2
        )

    [4] => Array
        (
            [df] => 1
            [da] => 1
        )

    [128] => Array
        (
            [df] => 1
            [da] => 1
        )

    [20] => Array
        (
            [df] => 0
            [da] => 2
        )

    [1] => Array
        (
            [df] => 1
            [da] => 2
        )

    [3] => Array
        (
            [df] => 1
            [da] => 2
        )

    [129] => Array
        (
            [df] => 1
            [da] => 1
        )

)

------解决方案--------------------
学习了，没序列化过几次。

------解决方案--------------------
我也学习了！！