如何求多维关联数组的和？

Question

如何对多维关联数组的值求和？我的数组如下：$testarray=[];$testarray[]=[    "2019-12-31" => [        "category1" => [            "total" => "10"            ],        "category2" => [            "total" => "20"            ],        ],    "2020-01-31" => [        "category1" => [            "total" => "100"            ],        "category2" => [            "total" => "200"            ],        ],    "2020-02-28" => [        "category1" =>  [            "total" => "1000"            ],        "category2" => [            "total" => "2000"            ]        ],    ];我尝试了以下方法：foreach($testarray[0] as $Offset=>$ArrayOfResults){    foreach($ArrayOfResults as $ResultOffset=>$Result){        $total+= $Result["total"];    }    $sums[$Offset]=$total;}结果是："2019-12-31" => 30"2020-01-31" => 330"2020-02-28" => 3330如何获得所需的结果，如下将类别 1 和类别 2 值相加："2019-12-31" => 30"2020-01-31" => 300"2020-02-28" => 3000

Answer 1

array_sum()使用and代替嵌套循环array_column()。

foreach ($testarray[0] as $date => $results) {
    $sums[$date] = array_sum(array_column($results, 'total'));

Answer 2

您只需要重置$total每次迭代：

foreach($testarray[0] as $Offset=>$ArrayOfResults){ 

    $total = 0;

    foreach($ArrayOfResults as $ResultOffset=>$Result){

        $total+= $Result["total"];

    }

    $sums[$Offset]=$total;

}