PHP数据适配器模式如何兼容接口

interface DataAdapterInterface {
    public function getId();
    public function getName();
    public function getEmail();
}

class ArrayDataAdapter implements DataAdapterInterface {
    private $data;

    public function __construct(array $data) {
        $this->data = $data;
    }

    public function getId() {
        return $this->data['id'] ?? null;
    }

    public function getName() {
        return $this->data['full_name'] ?? $this->data['name'] ?? '';
    }

    public function getEmail() {
        return $this->data['email_address'] ?? $this->data['email'] ?? '';
    }
}

class ObjectDataAdapter implements DataAdapterInterface {
    private $obj;

    public function __construct($obj) {
        $this->obj = $obj;
    }

    public function getId() {
        return $this->obj->user_id ?? $this->obj->id ?? null;
    }

    public function getName() {
        return $this->obj->username ?? $this->obj->name ?? '';
    }

    public function getEmail() {
        return $this->obj->contact_email ?? $this->obj->email ?? '';
    }
}

// 模拟从不同来源获取的数据
$arrayData = [
    'id' => 1,
    'full_name' => '张三',
    'email_address' => 'zhangsan@example.com'
];

$jsonString = '{"user_id": 2, "username": "李四", "contact_email": "lisi@example.com"}';
$objData = json_decode($jsonString);

// 创建对应的适配器
$adapter1 = new ArrayDataAdapter($arrayData);
$adapter2 = new ObjectDataAdapter($objData);

// 统一调用
function displayUserInfo(DataAdapterInterface $adapter) {
    echo "ID: " . $adapter->getId() . "\n";
    echo "姓名: " . $adapter->getName() . "\n";
    echo "邮箱: " . $adapter->getEmail() . "\n\n";
}

displayUserInfo($adapter1);
displayUserInfo($adapter2);

ID: 1
姓名: 张三
邮箱: zhangsan@example.com

ID: 2
姓名: 李四
邮箱: lisi@example.com