Combined Strings and sum numeric two multidimensional arrays in PHP - php

Question

I have below two arrays with strings and numbers,
I want to keep only one strings header and sum numeric value from each key value with another array.
I have tried many of the solutions available online but nothing found as required.
$array1 =
Array
(
[0] => Array
(
[0] => Out Of Warranty
[1] => Total Orders
[2] => Total Qty
[3] => Canceled Orders
)
[1] => Array
(
[0] => Today<br/>(04-26-2020)
[1] => 1
[2] => 1
[3] => 0
)
[2] => Array
(
[0] => Yesterday<br/>(04-25-2020)
[1] => 0
[2] => 0
[3] => 0
)
[3] => Array
(
[0] => This Week<br/>(04-20-2020 - 04-26-2020)
[1] => 22
[2] => 39
[3] => 0
)
[4] => Array
(
[0] => Last Week<br/>(04-13-2020 - 04-19-2020)
[1] => 7
[2] => 7
[3] => 0
)
[5] => Array
(
[0] => This Month<br/>(04-01-2020 - 04-26-2020)
[1] => 29
[2] => 46
[3] => 0
)
[6] => Array
(
[0] => This Year<br/>(01-01-2020 - 04-26-2020)
[1] => 30
[2] => 47
[3] => 0
)
)
$array2 =
Array
(
[0] => Array
(
[0] => Out Of Warranty
[1] => Total Orders
[2] => Total Qty
[3] => Canceled Orders
)
[1] => Array
(
[0] => Today<br/>(04-24-2020)
[1] => 10
[2] => 10
[3] => 0
)
[2] => Array
(
[0] => Yesterday<br/>(04-23-2020)
[1] => 7
[2] => 7
[3] => 0
)
[3] => Array
(
[0] => This Week<br/>(04-20-2020 - 04-24-2020)
[1] => 51
[2] => 51
[3] => 0
)
[4] => Array
(
[0] => Last Week<br/>(04-13-2020 - 04-19-2020)
[1] => 31
[2] => 31
[3] => 0
)
[5] => Array
(
[0] => This Month<br/>(04-01-2020 - 04-24-2020)
[1] => 93
[2] => 93
[3] => 0
)
[6] => Array
(
[0] => This Year<br/>(01-01-2020 - 04-24-2020)
[1] => 1281
[2] => 1281
[3] => 1
)
)
Expected output as Strings should be use only once and numbers should be added to each other.
For example output should be 6 index i.e sum of 6 index from array1 and array2 -
[6] => Array
(
[0] => This Year<br/>(01-01-2020 - 04-26-2020)
[1] => 1311
[2] => 1328
[3] => 1
)

Answer 1

If your arrays are always sorted in the same order:
$newItems = [];
foreach ($array1 as $key => $item) {
$newItems[] = [
$item[0],
$item[1] + $array2[$key][1],
$item[2] + $array2[$key][2],
$item[3] + $array2[$key][3],
];
}
If keys in arrays are in distinct orders:
$newItems = [];
foreach ($array1 as $item) {
$name = $item[0];
$newItems[$name] = $item;
}
foreach ($array2 as $item) {
$name = $item[0];
$newItems[$name][1] += $item[1];
$newItems[$name][2] += $item[2];
$newItems[$name][3] += $item[3];
}
// apply array_values to get 0-indexed array
$newItems = array_values($newItems);

Answer 2

Only iterate the elements that are necessary for your summing logic. Using 2 loops will be the most concise and deliberate way to sum columns [1], [2], and [3].
You can create a new output array, but merely adding the second array values to the first affords a simpler addition-assignment syntax.
Code: (Demo)
for ($i = 1, $size = count($array2); $i < $size; ++$i) { // don't iterate [0] subarray (headers)
for ($col = 1; $col <= 3; ++$col) { // don't iterate [0] element (name)
$array1[$i][$col] += $array2[$i][$col];
}
}
var_export($array1);
Output:
array (
0 =>
array (
0 => 'Out Of Warranty',
1 => 'Total Orders',
2 => 'Total Qty',
3 => 'Canceled Orders',
),
1 =>
array (
0 => 'Today<br/>(04-26-2020)',
1 => 11,
2 => 11,
3 => 0,
),
2 =>
array (
0 => 'Yesterday<br/>(04-25-2020)',
1 => 7,
2 => 7,
3 => 0,
),
3 =>
array (
0 => 'This Week<br/>(04-20-2020 - 04-26-2020)',
1 => 73,
2 => 90,
3 => 0,
),
4 =>
array (
0 => 'Last Week<br/>(04-13-2020 - 04-19-2020)',
1 => 38,
2 => 38,
3 => 0,
),
5 =>
array (
0 => 'This Month<br/>(04-01-2020 - 04-26-2020)',
1 => 122,
2 => 139,
3 => 0,
),
6 =>
array (
0 => 'This Year<br/>(01-01-2020 - 04-26-2020)',
1 => 1311,
2 => 1328,
3 => 1,
),
)