Symfony2 - 如何动态访问实体方法？

namespace AppBundle\Entity;

class User
{
    private $firstName;
    private $lastName;

    public function __construct($firstName, $lastName)
    {
        $this->firstName = $firstName;
        $this->lastName = $lastName;
    }

    public function getFullName()
    {
        return $this->firstName . ' ' . $this->lastName;
    }
}

namespace AppBundle\Controller;

use AppBundle\Entity\User;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Response;

class DefaultController extends Controller
{
    public function indexAction()
    {
        // 创建一个User实例
        $user = new User('John', 'Doe');

        // 使用反射API动态访问getFullName()方法
        $reflectionClass = new \ReflectionClass(User::class);
        $method = $reflectionClass->getMethod('getFullName');
        $fullName = $method->invoke($user);

        // 返回响应
        return new Response('Full name: ' . $fullName);
    }
}