理解PHP中的获取器和修改器：让数据操作更加智能化

class Person {
  private $name;

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

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

  public function setName($name) {
    $this->name = $name;
  }
}

$person = new Person("张三");
echo $person->getName();  // 输出：张三
$person->setName("李四");
echo $person->getName();  // 输出：李四

class User {
  private $name;
  private $email;

  public function __construct($name, $email) {
    $this->name = $name;
    $this->email = $email;
  }

  public function getName() {
    return "Mr/Ms. " . $this->name;
  }

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

  public function setEmail($email) {
    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
      $this->email = $email;
      echo "邮箱设置成功！";
    } else {
      echo "无效的邮箱地址！";
    }
  }
}

$user = new User("张三", "zhangsan@example.com");
echo $user->getName();  // 输出：Mr/Ms. 张三
echo $user->getEmail();  // 输出：zhangsan@example.com

$user->setEmail("lisi@example.com");  // 输出：邮箱设置成功！
echo $user->getEmail();  // 输出：lisi@example.com

$user->setEmail("invalid_email");
// 输出：无效的邮箱地址！
echo $user->getEmail();  // 输出：lisi@example.com