如何利用PHP7的匿名类实现简单的工厂模式？

interface User
{
    public function getInfo();
}

class Admin implements User
{
    public function getInfo()
    {
        return "This is an admin user.";
    }
}

class Member implements User
{
    public function getInfo()
    {
        return "This is a member user.";
    }
}

class UserFactory
{
    public static function createUser($type)
    {
        return new class($type) implements User {
            private $type;

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

            public function getInfo()
            {
                if ($this->type === 'admin') {
                    return new Admin();
                } elseif ($this->type === 'member') {
                    return new Member();
                } else {
                    throw new Exception('Unsupported user type.');
                }
            }
        };
    }
}

$admin = UserFactory::createUser('admin');
echo $admin->getInfo();  // 输出：This is an admin user.

$member = UserFactory::createUser('member');
echo $member->getInfo();  // 输出：This is a member user.