Diff Two PHP Arrays of Associative Arrays by ID

function diffAssociativeArraysById(array $oldArray, array $newArray, string $idKey): array
{
    $oldMap = [];
    foreach ($oldArray as $item) {
        if (isset($item[$idKey])) {
            $oldMap[$item[$idKey]] = $item;
        }
    }

    $newMap = [];
    foreach ($newArray as $item) {
        if (isset($item[$idKey])) {
            $newMap[$item[$idKey]] = $item;
        }
    }

    $added = [];
    $modified = [];
    $removed = [];

    foreach ($newMap as $id => $newItem) {
        if (!isset($oldMap[$id])) {
            $added[] = $newItem;
        } elseif ($oldMap[$id] !== $newItem) {
            // Simple comparison, might need deeper check for complex objects
            $modified[] = $newItem;
        }
    }

    foreach ($oldMap as $id => $oldItem) {
        if (!isset($newMap[$id])) {
            $removed[] = $oldItem;
        }
    }

    return ['added' => $added, 'modified' => $modified, 'removed' => $removed];
}

$oldProducts = [
    ['id' => 1, 'name' => 'Laptop', 'price' => 1200],
    ['id' => 2, 'name' => 'Mouse', 'price' => 25],
    ['id' => 3, 'name' => 'Keyboard', 'price' => 75],
];

$newProducts = [
    ['id' => 1, 'name' => 'Laptop Pro', 'price' => 1300], // Modified
    ['id' => 2, 'name' => 'Mouse', 'price' => 25],       // Unchanged
    ['id' => 4, 'name' => 'Monitor', 'price' => 300],    // Added
];

$diff = diffAssociativeArraysById($oldProducts, $newProducts, 'id');
/*
$diff will contain:
[
    'added' => [
        ['id' => 4, 'name' => 'Monitor', 'price' => 300]
    ],
    'modified' => [
        ['id' => 1, 'name' => 'Laptop Pro', 'price' => 1300]
    ],
    'removed' => [
        ['id' => 3, 'name' => 'Keyboard', 'price' => 75]
    ]
]
*/