PHP多维数组内爆？

<?php
// 原始复杂的多维数组
$complexArray = [
    'users' => [
        ['id' => 1, 'name' => 'Alice', 'details' => ['age' => 25, 'city' => 'New York']],
        ['id' => 2, 'name' => 'Bob', 'details' => ['age' => 30, 'city' => 'Los Angeles']]
    ],
    'products' => [
        ['id' => 101, 'name' => 'Laptop', 'price' => 999.99],
        ['id' => 102, 'name' => 'Smartphone', 'price' => 699.99]
    ]
];

// 封装函数简化数组访问
function getUserDetails($array, $userId) {
    foreach ($array['users'] as $user) {
        if ($user['id'] == $userId) {
            return $user['details'];
        }
    }
    return null;
}

// 使用封装函数获取用户详情
$aliceDetails = getUserDetails($complexArray, 1);
print_r($aliceDetails);
?>