Replace multidimensional array values with one-dimensional array - php

Question

I would like to change the values in one multidimensional array if a corresponding key is found in another flat, associative array.
I have these two arrays:
$full = [
'Cars' => [
'Volvo' => 0,
'Mercedes' => 0,
'BMW' => 0,
'Audi' => 0
],
'Motorcycle' => [
'Ducati' => 0,
'Honda' => 0,
'Suzuki' => 0,
'KTM' => 0
]
];
$semi = [
'Volvo' => 1,
'Audi' => 1
];
I want the array to look like this:
Array
(
[Cars] => Array
(
[Volvo] => 1
[Mercedes] => 0
[BMW] => 0
[Audi] => 1
)
[Motorcycle] => Array
(
[Ducati] => 0
[Honda] => 0
[Suzuki] => 0
[KTM] => 0
)
)
I get the $semi array back from my input field and want to merge it into $full to save it into my database.
I already tried array_replace() like:
$replaced = array_replace($full, $semi);

Answer 1

You should loop your $semi array and check if it exists in one of $full arrays, then add to it:
foreach ($semi as $semiItem => $semiValue) {
foreach ($full as &$fullItems) {
if (isset($fullItems[$semiItem])) {
$fullItems[$semiItem] = $semiValue;
}
}
}

Answer 2

You only need to visit "leafnodes", it will be very direct to iterate and modify the full array with array_walk_recursive().
Modern "arrow function" syntax allows access to the semi array without writing use().
This approach makes absolutely no iterated function calls. It modifies $v by reference (&$v), uses the "addition assignment" combined operator (+=), and the null coalescing opetator (??) to conditionally increase values in the full array which are found in the semi array.
Code: (Demo)
array_walk_recursive(
$full,
fn(&$v, $k) => $v += $semi[$k] ?? 0
);
var_export($full);
Not using array_walk_recursive() would necessitate using nested loops to increase qualifying manufacturers.
Code: (Demo)
foreach ($full as &$manufacturers) {
foreach ($manufacturers as $m => &$count) {
$count += $semi[$m] ?? 0;
}
}
var_export($full);