mio_lt;?php
    class cd
    {
        public $band = '';
        public $title = '';
        protected $mediator;
        public function __construct($mediator = null)
        {
            $this-mio_gt;mediator = $mediator;
        }
        public function save()
        {
            //保存到数据库
            var_dump($this);
        }
        public function chageBandName($name)
        {
            //如果存在中介者 则调用中介者的change()
            if(!empty($this-mio_gt;mediator))
                $this-mio_gt;_mediator-mio_gt;change($this, array('band'=mio_gt;$name));
            //调用自己的更新方法
            $this-mio_gt;band = $name;
            $this-mio_gt;save();
        }
    }
    //一个类似的类
    class MP3Archive
    {
        protected $mediator;
        public $title = '';
        public $band = '';
        public function __construct($mediator = null)
        {
            $this-mio_gt;mediator = $mediator;
        }
        public function save()
        {
            //同样是将更新后的数据写入数据库
            var_dump($this);
        }
        public function changeBandName($name)
        {
            //同理,但如果将这个动作移动到下面 中介者类会更加省事,少了个foreach
            if(!empty($this-mio_gt;mediator))
                $this-mio_gt;_mediator-mio_gt;change($this, array('band'=mio_gt;$name));
            $this-mio_gt;band = $name;
            $this-mio_gt;save();
        }
    }
    //中介者类
    class MusicContainerMediator
    {
        //用于保存需要通知更改的类
        protected $_containers = array();
        public function __construct()
        {
            $this-mio_gt;_containers[] = 'CD';
            $this-mio_gt;_containers[] = 'MP3Archive';
        }
        public function change($originalObject, $newValue)
        {
            $title = $originalObject-mio_gt;title;
            $band = $originalObject-mio_gt;band;
            foreach($this-mio_gt;_containers as $container){
                //排除掉发起更改的类
                if(empty($changedObject instanceof $container)){
                    $obj = new $container;
                    $obj-mio_gt;title = $title;
                    $obj-mio_gt;band = $band;
                    //update val
                    foreach($newValue as $k =mio_gt; $v)
                        $obj-mio_gt;$k = $v;
                    $obj-mio_gt;save();
                }
            }
        }
    }
?mio_gt;