在php中从多维数组构建单独的数组

我有一个多维数组

$output

Array 
( 
    [2015-02-23] => 
        Array 
        ( 
            [0] => Array ( [timestamp] => 2015-02-23T16:00:00 [temp] => -7 [time] => 16) 
            [1] => Array ( [timestamp] => 2015-02-23T19:00:00 [temp] => -13 [time] => 19) 
            [2] => Array ( [timestamp] => 2015-02-23T22:00:00 [temp] => -16 [time] => 22)
        ) 
    [2015-02-24] => 
        Array 
        ( 
            [0] => Array ( [timestamp] => 2015-02-24T01:00:00 [temp] => -18 [time] => 01) 
            [1] => Array ( [timestamp] => 2015-02-24T04:00:00 [temp] => -19 [time] => 04) 
            [2] => Array ( [timestamp] => 2015-02-24T07:00:00 [temp] => -19 [time] => 07) 
            [3] => Array ( [timestamp] => 2015-02-24T10:00:00 [temp] => -14 [time] => 10) 
            [4] => Array ( [timestamp] => 2015-02-24T13:00:00 [temp] => -10 [time] => 13) 
            [5] => Array ( [timestamp] => 2015-02-24T16:00:00 [temp] => -8 [time] => 16) 
            [6] => Array ( [timestamp] => 2015-02-24T19:00:00 [temp] => -10 [time] => 19)
            [7] => Array ( [timestamp] => 2015-02-24T22:00:00 [temp] => -8 [time] => 22) 
        ) 
    [2015-02-25] => 
        Array 
        ( 
            [0] => Array ( [timestamp] => 2015-02-25T01:00:00 [temp] => -6 [time] => 01) 
        ) 
)

如何从子阵列创建新阵列？所以

$output\u 0

：

Array 
    ( 
        [0] => Array ( [timestamp] => 2015-02-23T16:00:00 [temp] => -7 [time] => 16) 
        [1] => Array ( [timestamp] => 2015-02-23T19:00:00 [temp] => -13 [time] => 19) 
        [2] => Array ( [timestamp] => 2015-02-23T22:00:00 [temp] => -16 [time] => 22)
    ) 

$output\u 1

：

Array 
    ( 
        [0] => Array ( [timestamp] => 2015-02-24T01:00:00 [temp] => -18 [time] => 01) 
        [1] => Array ( [timestamp] => 2015-02-24T04:00:00 [temp] => -19 [time] => 04) 
        [2] => Array ( [timestamp] => 2015-02-24T07:00:00 [temp] => -19 [time] => 07) 
        [3] => Array ( [timestamp] => 2015-02-24T10:00:00 [temp] => -14 [time] => 10) 
        [4] => Array ( [timestamp] => 2015-02-24T13:00:00 [temp] => -10 [time] => 13) 
        [5] => Array ( [timestamp] => 2015-02-24T16:00:00 [temp] => -8 [time] => 16) 
        [6] => Array ( [timestamp] => 2015-02-24T19:00:00 [temp] => -10 [time] => 19)
        [7] => Array ( [timestamp] => 2015-02-24T22:00:00 [temp] => -8 [time] => 22) 
    ) 

$output_2

：

Array
    ( 
        [0] => Array ( [timestamp] => 2015-02-25T01:00:00 [temp] => -6 [time] => 01) 
    )

我从一个递归迭代器开始，但找不到如何从使用收集的值构建新数组的逻辑

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($output));
foreach ($iterator as $value) {

    print strtoupper($value) . " <br>";

}

$iterator=new recursiveiterator（new RecursiveArrayIterator（$output））；
foreach（$iterator作为$value）{
打印strtoupper（$value）。“
”；
}

但我不明白这样做有什么意义

---

您还可以使用

$output=array\u值（$output）。这给了你
$output[0]
，
$output[1]
和
$output[2]
对你的答案的极大补充-你似乎读懂了我的心思。日期会变，所以我不能事先知道。我没有想到
array\u value
如何对数组进行数字索引。这解决了我的问题。谢谢
$output_0 = $output['2015-02-23'];
$output_1 = $output['2015-02-24'];
$output_2 = $output['2015-02-25'];