how to sum in a multidimensional array in php - php

Question

As an example I have an array like this:
$Batches = array(
$Batch_1= array(
$A_Row= array(1,1,0,0),
$B_Row = array(0,0,0,1),
$C_Row = array(0,0,0,1)),
$Batch_2= array(
$A_Row= array(1,0,0,0),
$B_Row = array(0,0,0,1),
$C_Row = array(0,0,0,1))
);
I want to sum per each $n_Row:
So I should get a result like this:
$Sum_Array = array(
$A_row=array(2,1,0,0),
$B_row= array(0,0,0,2),
$C_row = array(0,0,0,2)
);
But I'm having difficulty trying to get this result and need some tips/advice from someone else.
This is my code so far:
//count rows and columns
$count_array= count($Batches);
$count_row = count($Batches[0]);
$count_column = count($Batches[0][0]);
$Array_sum = array();
for($array=0;$array<$count_array;$array++){
for($row=0;$row<$count_row;$row++){
for($col=0;$col<$count_column;$col++){
//echo $Batches[$array][$row][$col] . "\n";
if($Batches[$array][$row][$col]==1){
$Batches[$array][$row][$col]++;
}
$Array_sum[]=$Batches[$array][$row][$col];
}
}
}
Anyone who can help me in the right direction?
Thanks in advance.

Answer 1

I think your "array"
$Batches = array(
$Batch_1= array(
$A_Row= array(1,1,0,0),
$B_Row = array(0,0,0,1),
$C_Row = array(0,0,0,1)),
$Batch_2= array(
$A_Row= array(1,0,0,0),
$B_Row = array(0,0,0,1),
$C_Row = array(0,0,0,1))
);
is a product of the imagination. But it is also valid PHP code. I assume you want to work with keys and the array looks like this:
$Batches = array(
'Batch_1' => array(
'A_Row' => array(1,1,0,0),
'B_Row' => array(0,0,0,1),
'C_Row' => array(0,0,0,1)),
'Batch_2' => array(
'A_Row' => array(1,0,0,0),
'B_Row' => array(0,0,0,1),
'C_Row' => array(0,0,0,1))
);
The Summation works better with foreach.
$sum_arr = [];
foreach($Batches as $ib => $batch){
foreach($batch as $ir => $row){
foreach($row as $ic => $col){
$sum_arr[$ir][$ic] ??= 0;
$sum_arr[$ir][$ic] += $col;
}
}
}
var_export($sum_arr);
The Output:
array (
'A_Row' =>
array (
0 => 2,
1 => 1,
2 => 0,
3 => 0,
),
'B_Row' =>
array (
0 => 0,
1 => 0,
2 => 0,
3 => 2,
),
'C_Row' =>
array (
0 => 0,
1 => 0,
2 => 0,
3 => 2,
),
)
The summation also works with the original array. However, this array has only numeric keys.