PHP:我可以在方法重载(__get)中获得数组功能吗？

class MyClass {
    private $data = array();

    public function __get($key) {
        if (array_key_exists($key, $this->data)) {
            return $this->data[$key];
        }
        return null;
    }

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

$obj = new MyClass();
$obj->name = "John";
$obj->age = 30;

echo $obj->name; // 输出 "John"
echo $obj->age; // 输出 30