PHP中两个多维数组的SUM值

Question

我有一个问题，如何在 PHP 中对两个多维数组的值求和。 两个数组存储在变量中，例如 $array_1 和 $array_2

$array_1 和 $array_2 都有子数组，它们的数据又存储在各自的数组中。请注意，数据被组织为 x 数据和 y 数据，其中 y 数据只是一个日期戳。

我需要对这两个数组 $array_1 和 $array_2 的 x 数据值求和，就 y 数据 (DATE) 维度而言。这就是为什么它对我来说很棘手，我发现的关闭答案只有数字。

例子：

$array_1

Array
(
    [0] => object
        (
            [x-data] => Array
                (
                    [data1] => 0
                    [data2] => 1
                    [data3] => 2
                    [data4] => 3
                    [data5] => 4
                    [data6] => 5
                    [data7] => 6
                    [data8] => 7
                )

            [y-data] => Array
                (
                    [date] => 20141127
                )

        )

    [1] => object
        (
            [x-data] => Array
                (
                    [data1] => 2
                    [data2] => 4
                    [data3] => 6
                    [data4] => 8
                    [data5] => 10
                    [data6] => 12
                    [data7] => 14
                    [data8] => 16
                )

            [y-data] => Array
                (
                    [date] => 20141128
                )

        )

)

$array_2

Array
(
    [0] => object
        (
            [x-data] => Array
                (
                    [data1] => 0
                    [data2] => 1
                    [data3] => 2
                    [data4] => 3
                    [data5] => 4
                    [data6] => 5
                    [data7] => 6
                    [data8] => 7
                )

            [y-data] => Array
                (
                    [date] => 20141127
                )

        )

    [1] => object
        (
            [x-data] => Array
                (
                    [data1] => 0
                    [data2] => 1
                    [data3] => 2
                    [data4] => 3
                    [data5] => 4
                    [data6] => 5
                    [data7] => 6
                    [data8] => 7
                )

            [y-data] => Array
                (
                    [date] => 20141128
                )

        )

)

$result = $array_1 + $array_2 应该如下所示：

Array
(
    [0] => object
        (
            [x-data] => Array
                (
                    [data1] => 0
                    [data2] => 2
                    [data3] => 4
                    [data4] => 6
                    [data5] => 8
                    [data6] => 10
                    [data7] => 12
                    [data8] => 14
                )

            [y-data] => Array
                (
                    [date] => 20141127
                )

        )

    [1] => object
        (
            [x-data] => Array
                (
                    [data1] => 2
                    [data2] => 5
                    [data3] => 8
                    [data4] => 11
                    [data5] => 14
                    [data6] => 17
                    [data7] => 20
                    [data8] => 23
                )

            [y-data] => Array
                (
                    [date] => 20141128
                )

        )

)

我已经尝试了一些东西，例如 foreach() 内部的 foreach() 但我得到了数组值的乘法效果（2 x 2 = 4 个子数组而不是 2）。

有什么帮助吗？ 谢谢！

Answer 1

这是一个部分答案，因为这仅适用于 $array1 和 $array2 具有相同数量的元素并且具有唯一的 y 数据，并且它们的每个 x 数据（具有共同的 y 数据）具有相同的数字元素。

$result = array_multisum($array1, $array2);

function array_multisum($array1, $array2)
{
    $newArray = array();
    foreach ($array1 as $object1) {
        $newObject = new stdClass();
        // find object in the 2nd array having the same data as current object
        foreach ($array2 as $object2) {
            // if object is found, sum the x-data with the current object 
            if ($object1->{'y-data'}['date'] === $object2->{'y-data'}['date']) {
                $newObject->{'x-data'} = data_sum($object1->{'x-data'}, $object2->{'x-data'});
                break;
            }
        }
        $newObject->{'y-data'} = $object1->{'y-data'};
        $newArray[] = $newObject;
    }
    return $newArray;
}

function data_sum($data1, $data2) 
{
    $newData = array();
    // sum up the values for each key
    foreach (array_keys($data1) as $key) {
        $newData[$key] = $data1[$key] + $data2[$key];
    }
    return $newData;
}