使用PHP trait DTO提高代码复用性

trait DTO {
    private $data = [];

    public function setData(array $data): void {
        $this->data = $data;
    }

    public function getData(): array {
        return $this->data;
    }

    public function __get(string $name) {
        return $this->data[$name] ?? null;
    }

    public function __set(string $name, $value) {
        $this->data[$name] = $value;
    }

    public function __isset(string $name): bool {
        return isset($this->data[$name]);
    }

    public function __unset(string $name) {
        unset($this->data[$name]);
    }
}

class User {
    use DTO;

    private $id;
    private $name;
    private $email;

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

$userData = [
    'id' => 1,
    'name' => 'John',
    'email' => 'john@example.com',
];

$user = new User($userData);

echo $user->id; // 输出1
echo $user->name; // 输出John
echo $user->email; // 输出john@example.com

$user->email = 'newemail@example.com';

var_dump(isset($user->email)); // 输出bool(true)

unset($user->email);

var_dump(isset($user->email)); // 输出bool(false)