PHP合并数组数组和增量值？

Question

I have the following array structure:

[0] => Array
    (
        [name] => Spinat boller
        [amount] => 3
        [category] => Bløddej og Boller
        [unit_amount] => 15
    )

[1] => Array
    (
        [name] => Bedste boller
        [amount] => 15
        [category] => Bløddej og Boller
        [unit_amount] => 15
    )

[2] => Array
    (
        [name] => Grov boller
        [amount] => 15
        [category] => Bløddej og Boller
        [unit_amount] => 15
    )

I have multiple of these arrays, and i would like to merge them on the AMOUNT KEY ONLY. That means if i have another array containing this:

[0] => Array
    (
        [name] => Spinat boller
        [amount] => 2
        [category] => Bløddej og Boller
        [unit_amount] => 15
    )

And i merge it, it would show this:

[0] => Array
    (
        [name] => Spinat boller
        [amount] => 5
        [category] => Bløddej og Boller
        [unit_amount] => 15
    )

Obviously i could traverse this manually, but i was hoping i could utilize the PHP Merge function somehow, but not sure how to go about it.

Thanks everyone!

* Edit 1 * If i just do the array_merge function, it simply appends it all together, so i go from:

[0] => Array
(
    [name] => Spinat boller
    [amount] => 3
    [category] => Bløddej og Boller
    [unit_amount] => 15
)

to:

[0] => Array
(
    [name] => Spinat boller
    [amount] => 3
    [category] => Bløddej og Boller
    [unit_amount] => 15
)
[0] => Array
(
    [name] => Spinat boller
    [amount] => 2
    [category] => Bløddej og Boller
    [unit_amount] => 15
)

but i want:

[0] => Array
(
    [name] => Spinat boller
    [amount] => 3
    [category] => Bløddej og Boller
    [unit_amount] => 15
)

[0] => Array ( [name] => Spinat boller [amount] => 5 [category] => Bløddej og Boller [unit_amount] => 15 )

Notice how the amount is now 5 (the other arrays had 2 and 3). Everything else is the same and matches, ONLY the amount gets added and incremented.

Answer 1

So I gave it some thought, to see if it's possible to do it in a single expression.

You have to combine quite a few functions, but the behaviour is the same as with manual iteration. The result of this functional approach looks like this:

$result = array_values(
    array_merge(
        ...array_reverse(
            array_map(function ($arr) {
                return array_combine(
                    array_column($arr, 'name'),
                    array_values($arr)
                );
            }, [$arr1, $arr2, $arr3])
        )
    )
);

Though it can be done, I sticking with the iteration approach would be best for maintainability reasons:

$tmp = [];

foreach ($arrays as $arr) {
    foreach ($arr as $elem) {
        if (!isset($tmp[$elem['name']])) {
            $tmp[$elem['name']] = $elem;
        }
    }
}

$result = array_values($tmp);