如何對(duì)多維關(guān)聯(lián)數(shù)組的值求和？我的數(shù)組如下：$testarray=[];$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"            ]        ],    ];我嘗試了以下方法：foreach($testarray[0] as $Offset=>$ArrayOfResults){    foreach($ArrayOfResults as $ResultOffset=>$Result){        $total+= $Result["total"];    }    $sums[$Offset]=$total;}結(jié)果是："2019-12-31" => 30"2020-01-31" => 330"2020-02-28" => 3330如何獲得所需的結(jié)果，如下將類別 1 和類別 2 值相加："2019-12-31" => 30"2020-01-31" => 300"2020-02-28" => 3000