Sum values in an multi-dimensional array - php

Question

I want to sum the values of the following array
I would like to group the same items by cumulating them, the output format would also be an array
Array
(
[0] => Array
(
[0] => Array
(
[0] => R421_FD03
[1] => 1
)
[1] => Array
(
[0] => R421_FD03
[1] => 1
)
)
[1] => Array
(
[0] => Array
(
[0] => R421_FD03
[1] => 1
)
[1] => Array
(
[0] => R421_FD02
[1] => 1
)
)
)
I tested this code but the result is not the one I'm waiting for:
$sumArray = array();
array_walk_recursive($data, function($item, $key) use (&$sumArray){
$sumArray[$key] = isset($sumArray[$key]) ? $item + $sumArray[$key] : $item;
});
The result I'm waiting for is this one
Array
(
[0] => Array
(
[0] => R421_FD03
[1] => 3
)
[1] => Array
(
[0] => R421_FD02
[1] => 1
)
)
)

Answer 1

You can apply simple foreach() with array_values()
$final_array = [];
foreach($array as $arr){
foreach($arr as $ar){
$final_array[$ar[0]][0] = $ar[0];
$final_array[$ar[0]][1] = (isset($final_array[$ar[0]][1])) ? $final_array[$ar[0]][1] + $ar[1] : $ar[1];
}
}
$final_array = array_values($final_array);
print_r($final_array);
Output:-https://3v4l.org/lABWG

Answer 2

You can use array_merge with splat operator and then iterate through the array
$merged = array_merge(...$arr);//splat operator
$r = [];
array_walk($merged, function($v,$k) use(&$r){
array_key_exists($v['0'], $r) ? ($r[$v[0]] += $v['1']) : ($r[$v[0]] = $v[1]);
});
print_r($r);
Result :-
Array
(
[R421_FD03] => 3
[R421_FD02] => 1
)