在多维数组中对值进行分组和求和时未定义的索引 [英] Undefined index when Grouping and sum values in multidimensional array

问题描述

我正在使用下面的代码按 currency 将数组$summary分组，并获得分组的持续时间和成本的总和.到目前为止，我可以对数组进行分组和求和，但是由于数组单元格$result[$split['currency']]['duration']和$result[$split['currency']]['cost']是未定义的，因此我在运行代码时会注意到.如何在不使用error_reporting(0)的情况下删除通知?

I am using the below code to group the array $summary by currency and get the sum of grouped duration and cost. So far I am able to group and sum the array but since the array cells $result[$split['currency']]['duration'] and $result[$split['currency']]['cost'] are undefined I am getting notice when I run the code. How can I remove the notice without using error_reporting(0)?

foreach ($summary as $split) {

            if (isset($split['currency'])) {
                $result[$split['currency']]['duration'] += $split['duration'];
                $result[$split['currency']]['cost'] += $split['cost'];
            } else {
                $result[0]['duration'] += $split['duration'];
                $result[0]['cost'] += $split['cost'];
            }
        }

编辑

$summary = Array
(
[0] => Array
    (
        [currency] => SGD
        [duration] => 8.00
        [cost] => 228.57
    )

[1] => Array
    (
        [currency] => SGD
        [duration] => 8.00
        [cost] => 228.57
    )

[2] => Array
    (
        [currency] => 
        [duration] => 8.00
        [cost] => 
    )

[3] => Array
    (
        [currency] => MYR
        [duration] => 12.00
        [cost] => 342.86
    )

[4] => Array
    (
        [currency] => SGD
        [duration] => 8.00
        [cost] => 228.57
    )

[5] => Array
    (
        [currency] => MYR
        [duration] => 12.00
        [cost] => 342.86
    )

$result如下所示

 Array
(
[0] => Array
    (
        [currency] => SGD
        [duration] => 24
        [cost] => 685.71
    )

[1] => Array
    (
        [currency] => MYR
        [duration] => 24
        [cost] => 685.72
    )

[2] => Array
    (
        [currency] => 
        [duration] => 8
        [cost] => 0
    )

)

推荐答案

您需要先定义数组:

foreach ($summary as $split) {
        if (isset($split['currency'])) {
            if (!isset($result[$split['currency']]) {
                $result[$split['currency']] = [
                    'duration' => 0,
                    'cost' => 0
                ];
            }
            $result[$split['currency']]['duration'] += $split['duration'];
            $result[$split['currency']]['cost'] += $split['cost'];
        } else {
            $result[0]['duration'] += $split['duration'];
            $result[0]['cost'] += $split['cost'];
        }
    }

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