PHP Subtract multidimensional arrays based on 2 values - php

Question

I need to subtract the qt from two arrays based on id and type, keeping the array complete.
How do I do in php to be able to subtract these arrays?
I have 2 arrays:
=> this is the first array with multiple key "down"
Array
(
[0] => Array
(
[id] => 26
[loc] => 1
[type] => down
[qt] => 12
)
[1] => Array
(
[id] => 32
[loc] => 1
[type] => down
[qt] => 34
)
[2] => Array
(
[id] => 26
[loc] => 2
[type] => down
[qt] => 5
)
[3] => Array
(
[id] => 86
[loc] => 3
[type] => down
[qt] => 45
)
[4] => Array
(
[id] => 23
[loc] => 9
[type] => down
[qt] => 3
)
[5] => Array
(
[id] => 23
[loc] => 3
[type] => down
[qt] => 99
)
)
=> this is the second array with multiple key "up"
Array
(
[0] => Array
(
[id] => 26
[loc] => 1
[type] => up
[qt] => 5
)
[1] => Array
(
[id] => 86
[loc] => 3
[type] => up
[qt] => 27
)
[2] => Array
(
[id] => 23
[loc] => 9
[type] => up
[qt] => 3
)
)
=> I need cubtract "qt" (if "id" and "loc" are the same then subtract the "qt")
Array
(
[0] => Array
(
[id] => 26
[loc] => 1
[type] => total
[qt] => 7
)
[1] => Array
(
[id] => 32
[loc] => 1
[type] => total
[qt] => 34
)
[2] => Array
(
[id] => 26
[loc] => 2
[type] => total
[qt] => 5
)
[3] => Array
(
[id] => 86
[loc] => 3
[type] => total
[qt] => 18
)
[4] => Array
(
[id] => 23
[loc] => 9
[type] => total
[qt] => 0
)
[5] => Array
(
[id] => 23
[loc] => 3
[type] => down
[qt] => 99
)
)

Answer 1

Try this out
function findMatch($array, $id, $loc)
{
foreach ($array as $key => $item) {
if ($item["id"] == $id and $item["loc"] == $loc) {
return $key;
}
}
return false;
}
$total = [];
foreach($down as $d) {
$matched = findMatch($up, $d["id"], $d["loc"]);
if($matched !== false){
$total[] = array_replace($d, [
"type" => "total",
"qt" => ($d["qt"] - $up[$matched]["qt"])
]);
} else {
$total[] = array_replace($d, ["type" => "total"]);
}
}
print_r($total);