PHP方法能否访问私有属性_PHP方法访问私有属性的规则与实现方法

class User {
    private $name;

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

    public function setName($name) {
        if (!empty($name)) {
            $this->name = trim($name);
        }
    }
}

$user = new User();
$user->setName("Alice");
echo $user->getName(); // 输出: Alice

class Person {
    private $data = [];

    private $hiddenFields = ['ssn', 'password'];

    public function __get($key) {
        if (array_key_exists($key, $this->data)) {
            if (in_array($key, $this->hiddenFields)) {
                throw new Exception("无法访问敏感字段: $key");
            }
            return $this->data[$key];
        }
        return null;
    }

    public function __set($key, $value) {
        if (in_array($key, $this->hiddenFields)) {
            throw new Exception("禁止设置敏感字段: $key");
        }
        $this->data[$key] = $value;
    }
}

$person = new Person();
$person->name = "Bob";
echo $person->name; // 输出: Bob

// $person->ssn = "123-45-6789"; // 会抛出异常

$reflection = new ReflectionClass('User');
$property = $reflection->getProperty('name');
$property->setAccessible(true); // 绕过 private 限制

$user = new User();
$user->setName("Charlie");
echo $property->getValue($user); // 输出: Charlie