关于一个数组的有关问题，重新组合

$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
                )

        )

)

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
                        (