多維數組，對同一個key的值求和

Question

我有一個多維數組。 我需要用相同的“驅動程序”和“日期”鍵來總結距離值

Input : 

$firstArr = array(
0 =>array('driver'=>'xxxx',
                    'distance' => 100,
                    'vehicle' => 1,
                    'date' => '2019-10'),

1=>array('driver'=>'xxxx',
                    'distance' => 200,
                    'vehicle' => 2,
                    'date' => '2019-10'),
2=>array('driver'=>'yyyy',
                    'distance' => 100,
                    'vehicle' => 3,
                    'date' => '2019-10'));

預期輸出：

$finalArr = array(
0 =>array('driver'=>'xxxx',
                    'distance' => 300,
                    'vehicle' => '1,2',
                    'date' => '2019-10'),

1=>array('driver'=>'yyyy',
                    'distance' => 100,
                    'vehicle' => 3,
                    'date' => '2019-10'));

我試過下面的代碼。 但輸出是一個按日期排列的數組。

$subArr = array();
foreach($firstArr as $key => $val){
$subArr[$val['driver']][$val['date']]['distance'] += $val['distance'];
$subArr[$val['driver']][$val['date']]['vehicle'] .= $val['vehicle'].',';
$subArr[$val['driver']][$val['date']]['date'] = $val['date'];
$subArr[$val['driver']][$val['date']]['driver'] = $val['driver'];

}
$result = array_values($subArr); 

Answer 1

您可以使用dirver和date作為重點， 演示

$result = [];
foreach($array as $v){
    $key = $v["driver"] . "_" . $v["date"];
    if(isset($result[$key])){
        $result[$key]["distance"] += $v["distance"];
    }else{
        $result[$key] = $v;
    }
}
$result = array_values($result);

Answer 2

使用dreiver列作為索引來dreiver和連接事物，操作如下：-

$finalArray= array();

foreach($firstArr as $arr){

    if(!isset($finalArray[$arr['driver']])){

        $finalArray[$arr['driver']] = $arr;
    }else{
     $finalArray[$arr['driver']]['distance']=  $finalArray[$arr['driver']]['distance']+$arr['distance'];
     $finalArray[$arr['driver']]['vehicle']=  $finalArray[$arr['driver']]['vehicle'].','.$arr['vehicle'];
    }
}
$finalArray = array_values($finalArray);
print_r($finalArray);

輸出： -https : //3v4l.org/ZTem8

Answer 3

您還可以使用array_reduce來按駕駛員和日期匯總距離和車輛。 借助於array_combine，我們可以為每個驅動程序日期組合設置初始數組（如果不存在），然后處理必填字段。

$keys = array_keys($input[0]);
$result = array_reduce($input, function ($sum, $row) use ($keys) {
    $key = $row['driver'] . $row['date'];
    $sum[$key] = $sum[$key] ?? array_combine($keys, [$row['driver'], null, null, $row['date']]);
    $sum[$key]['distance'] += $row['distance'];
    $sum[$key]['vehicle'] .= (($sum[$key]['vehicle']) ? ',': '' ) . $row['vehicle'];
    return $sum;
}, []);

結果是：

Array
(
    [xxxx2019-10] => Array
        (
            [driver] => xxxx
            [distance] => 300
            [vehicle] => 1,2
            [date] => 2019-10
        )

    [yyyy2019-10] => Array
        (
            [driver] => yyyy
            [distance] => 100
            [vehicle] => 3
            [date] => 2019-10
        )

)