多维数组，相同键的总和

Question

我有一个多维数组。我需要使用相同的“驱动程序”和“日期”键总结距离值

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'));

预期输出：

$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'));

我尝试了以下代码。但是输出是按日期排列的数组。

$subArr = array();
foreach($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作为键，

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

Answer 2

执行如下操作：-

$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'];
    }
}

print_r(array_values($finalArray));

输出：-https://3v4l.org/S8hdn