使用PHP trait DTO实现数据交互的可复用性与可扩展性

class BaseDTO {
    protected $data;
    protected $mapping;

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

        foreach ($data as $key => $value) {
            if (isset($this->mapping[$key])) {
                $this->data[$this->mapping[$key]] = $value;
            }
        }
    }

    public function toArray() {
        return $this->data;
    }

    public function __get($name) {
        if (isset($this->mapping[$name])) {
            return $this->data[$this->mapping[$name]];
        }

        return null;
    }

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

require_once 'BaseDTO.php';

trait UserDTO
{
    public function getId()
    {
        return $this->id;
    }

    public function getName()
    {
        return $this->name;
    }
    
    public function getEmail()
    {
        return $this->email;
    }
}

class User extends BaseDTO
{
    use UserDTO;

    protected $id;
    protected $name;
    protected $email;

    protected $mapping = [
        'id' => 'id',
        'name' => 'name',
        'email' => 'email',
    ];
}