如何在PHP8中使用Constructor Property Promotion简化数据库操作？

class User {
    private $db;
    private $id;
    private $name;
    private $email;
    
    public function __construct($db, $id) {
        $this->db = $db;
        $this->id = $id;
        
        // 根据ID从数据库中加载用户数据
        $stmt = $this->db->prepare("SELECT * FROM users WHERE id = ?");
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $result = $stmt->get_result();
        
        // 将查询结果赋值给属性
        $row = $result->fetch_assoc();
        $this->name = $row['name'];
        $this->email = $row['email'];
    }
    
    // ...
}

class User {
    public function __construct(private $db, private $id) {
        // 根据ID从数据库中加载用户数据
        $stmt = $this->db->prepare("SELECT * FROM users WHERE id = ?");
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $result = $stmt->get_result();
        
        // 将查询结果赋值给属性
        $row = $result->fetch_assoc();
        $this->name = $row['name'];
        $this->email = $row['email'];
    }
    
    // ...
}

class User {
    public function __construct(private $db, private $id) {
        // 根据ID从数据库中加载用户数据
        $stmt = $this->db->prepare("SELECT * FROM users WHERE id = ?");
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $result = $stmt->get_result();
        
        // 将查询结果赋值给属性
        $row = $result->fetch_assoc();
        $this->name = $row['name'];
        $this->email = $row['email'];
    }
    
    public function getName() {
        return $this->name;
    }
    
    public function getEmail() {
        return $this->email;
    }
}

// 创建数据库连接
$db = new Mysqli("localhost", "username", "passWord", "database");

// 创建User对象，并传入数据库连接和用户ID
$user = new User($db, 1);

// 使用User对象获取用户信息
echo "Name: " . $user->getName() . "<br>";
echo "Email: " . $user->getEmail() . "<br>";