Laravel根据其他集合替换集合值

// 用户集合
$users = collect([
    ['id' => 1, 'name' => 'Alice'],
    ['id' => 2, 'name' => 'Bob'],
    ['id' => 3, 'name' => 'Charlie'],
]);

// 订单集合
$orders = collect([
    ['id' => 101, 'user_id' => 2, 'product' => 'Book'],
    ['id' => 102, 'user_id' => 1, 'product' => 'Pen'],
    ['id' => 103, 'user_id' => 3, 'product' => 'Notebook'],
]);

// 根据订单集合中的 user_id 替换用户集合中的用户名
$orders->map(function ($order) use ($users) {
    $user = $users->firstWhere('id', $order['user_id']);
    return [
        'order_id' => $order['id'],
        'user_name' => $user ? $user['name'] : 'Unknown',
        'product' => $order['product'],
    ];
});

$usersByKey = $users->keyBy('id');

$orders->map(function ($order) use ($usersByKey) {
    $user = $usersByKey[$order['user_id']] ?? ['name' => 'Unknown'];
    return [
        'order_id' => $order['id'],
        'user_name' => $user['name'],
        'product' => $order['product'],
    ];
});