Inheritance: extends Subject
Example #1
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}
class RealSubject implements Subject
{
    public function request()
    {
        echo "RealSubject request\n";
    }
    public function display()
    {
        echo "RealSubject display\n";
    }
}
class ProxySubject
{
    private $_subject = null;
    public function __construct()
    {
        $this->_subject = new RealSubject();
    }
    public function request()
    {
        $this->_subject->request();
    }
    public function display()
    {
        $this->_subject->display();
    }
}
$objProxy = new ProxySubject();
$objProxy->request();
$objProxy->display();
    {
    }
}
class ProxySubject extends Subject
{
    // 代理主题角色
    private $_real_subject = NULL;
    public function __construct()
    {
    }
    public function action()
    {
        $this->_beforeAction();
        if (is_null($this->_real_subject)) {
            $this->_real_subject = new RealSubject();
        }
        $this->_real_subject->action();
        $this->_afterAction();
    }
    private function _beforeAction()
    {
        echo '在action前,我想干点啥....';
    }
    private function _afterAction()
    {
        echo '在action后,我还想干点啥....';
    }
}
// client
$subject = new ProxySubject();
$subject->action();