Summarize the same key name in php multidimensional array - php

Question

I have an array like this:
[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
...
)
)
I want to add one more row = total of all items
[1] => Array
(
[id_station] =>
[hour] =>
[data] => Array
(
[cameraon] => 4261120
[cameraoff] => 6204
[camerabroken] => 147525
)
)
I used array_sum(array_column($array["data], 'cameraon')) but I have to do for all items cameraon, cameraoff, camerabroken (I have a hundred items).
Is there any way to get total row in this case?

Answer 1

I assume that you don't know the depth of data sub-array. (that is how many key-value pairs are there)
So do like below:-
$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;
}
}
Output:-https://eval.in/926729

Answer 2

You wish to sum the columnar data, so leveraging array_sum() and array_column() are wise choices. The only thing left to do is set up the loop.
You can first isolate the data subarrays using array_column() then "drill down" into the first subarray to iterate each column. Use the column names to access all values in all columns. This makes the method dynamically successful regardless of the complexity of your data subarrays.
Code: (Demo)
$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
Output:
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,
),
),
)