/**
 * Subject.php
 * Interface Subject
 */
interface Subject
{
    public function request();
}
/**
 * RealSubject.php
 * Class RealSubject
 */
class RealSubject implements Subject
{
    /**
     * 真实请求方法具体实现
     */
    public function request()
    {
        // TODO: Implement request() method.
        echo "真实的请求<br/>\n";
    }
}
/**
 * Proxy.php
 * Class Proxy
 */
class Proxy implements Subject
{
    /**
     * @var RealSubject
     */
    protected $realSubject;
    /**
     * Proxy constructor.
     */
    public function __construct()
    {
        $this->realSubject = new RealSubject();
    }
    /**
     * 调用真实请求方法
     */
    public function request()
    {
        // TODO: Implement request() method.
        $this->realSubject->request();
    }
}

$proxy = new Proxy();
$proxy->request();