php - 总结php多维数组中相同的键名

Question

我有一个这样的数组：

[0] => Array
            (
                [id_station] => 2397
                [hour] => 12
                [data] => Array
                    (
                        [cameraon] => 355654
                        [cameraoff] => 4532
                        [camerabroken] => 76745
                        ...
                    )
            )
[1] => Array
            (
                [id_station] => 2399
                [hour] => 13
                [data] => Array
                    (
                        [cameraon] => 3905466
                        [cameraoff] => 1672
                        [camerabroken] => 70780
                        ...
                    )
            )

我想再添加一行 = 所有项目的总和

[1] => Array
            (
                [id_station] => 
                [hour] => 
                [data] => Array
                    (
                        [cameraon] => 4261120
                        [cameraoff] => 6204
                        [camerabroken] => 147525
                    )
            )

我用过array_sum(array_column($array["data], 'cameraon'))，但我必须为所有项目做cameraon，，cameraoff（camerabroken我有一百个项目）。

在这种情况下，有什么办法可以获得总行数？

Answer 1

我假设您不知道data子阵列的深度。（即有多少键值对）

所以像下面这样： -

$final_array = [];
$final_array['id_station'] ='';
$final_array['hour'] ='';
foreach($original_array as $original_arr){
  foreach($original_arr['data'] as $key=>$original){
     $final_array['data'][$key] +=$original;
  }
}

输出：- https://eval.in/926729

Answer 2

您希望对柱状数据求和，因此利用array_sum()和array_column()是明智的选择。剩下要做的就是设置循环。

您可以首先data使用array_column()“向下钻取”到第一个子数组以迭代每一列来隔离子数组。使用列名访问所有列中的所有值。无论data子数组的复杂性如何，这都会使该方法动态成功。

代码：（演示）

$array=[
    [
        'id_station'=>2397,
        'hour'=>12,
        'data'=>['cameraon'=>355654,'cameraoff'=>4532,'camerabroken'=>76745]
    ],
    [
        'id_station'=>2399,
        'hour'=>14,
        'data'=>['cameraon'=>3905466,'cameraoff'=>1672,'camerabroken'=>70780]
    ]
];
$datas=array_column($array,'data');  // isolate the data subarrays
foreach(current($datas) as $column=>$data){  // iterate the columns
    $result[$column]=array_sum(array_column($datas,$column));  // sum the column values
}
$array[]=['id_station'=>'','hour'=>'','data'=>$result];  // completenew item and append
var_export($array);  // print to screen

输出：

array (
  0 => 
  array (
    'id_station' => 2397,
    'hour' => 12,
    'data' => 
    array (
      'cameraon' => 355654,
      'cameraoff' => 4532,
      'camerabroken' => 76745,
    ),
  ),
  1 => 
  array (
    'id_station' => 2399,
    'hour' => 14,
    'data' => 
    array (
      'cameraon' => 3905466,
      'cameraoff' => 1672,
      'camerabroken' => 70780,
    ),
  ),
  2 => 
  array (
    'id_station' => '',
    'hour' => '',
    'data' => 
    array (
      'cameraon' => 4261120,
      'cameraoff' => 6204,
      'camerabroken' => 147525,
    ),
  ),
)