file_get_contents('php://input')数据如何转换成数组[2.0]

有时候表单数据量过大，就该用 file_get_contents('php://input') 得到的数据如下：

name[1][]=啊啊&name[2][]=啊啊&name[4][]=搜索&name[6][]=色&address[]=是的&address[]=恩爱&address[]=的我&sss[1]=wean&submit=Submit

可这串数据如何转换成：

Array
(
    [name] => Array
        (
            [1] => Array
                (
                    [0] => 啊啊
                )

            [2] => Array
                (
                    [0] => 啊啊
                )

            [4] => Array
                (
                    [0] => 搜索
                )

            [6] => Array
                (
                    [0] => 色
                )

        )

    [address] => Array
        (
            [0] => 是的
            [1] => 恩爱
            [2] => 的我
        )

    [sss] => Array
        (
            [1] => wean
        )

    [submit] => Submit
)

$str = 'name[1][]=啊啊&name[2][]=啊啊&name[4][]=搜索&name[6][]=色&address[]=是的&address[]=恩爱&address[]=的我&sss[1]=wean&submit=Submit';
parse_str($str, $data);
var_export($data);
[]就是数组吧
这不就是x-www-urlencoded类型，为嘛不用$_POST