关于一个数组的有关问题，重新组合

关于一个数组的问题，重新组合
原数组：

$arr=array

(

    [0] => Array

        (

            [caseid] => 31

            [name] => 张三

            [shijian] => Array

                (

                    [0] => 8:00

                    [1] => 18:00

                )


        )


    [1] => Array

        (

            [caseid] => 32

            [name] => 李四

            [shijian] => Array

                (

                    [0] => 8:00

                    [1] => 12:00

                    [2] => 18:00

                )


        )


    [2] => Array

        (

            [caseid] => 33

            [name] => 王五

            [shijian] => Array

                (

                    [0] => 8:00

                    [1] => 12:00

                    [2] => 18:00

                )


        )


)

我要将这个数组 重新组合，按照时间组合，组合完毕应该是这样的，搞了好久搞不出来。求助，谢谢

Array

(

    [0] => Array

        (

            [time] => 8:00

            [detail] => Array

                (

                    [0] => Array

                        (

                            [caseid] => 31

                            [casename] => 张三

                            

                        )

					[1] => Array

						(

							[caseid] => 32

							[casename] =>李四


						)

					[2] => Array

						(

							[caseid] => 33

							[casename] => 王五


						)


                )


        )


    [1] => Array

        (

            [time] => 12:00

            [detail] => Array

                (

                    [0] => Array

                        (