桥接模式

<?php
//桥接模式
abstract class info {
    protected $send = null;
    
    public function __construct(Send $send){
        $this->send = $send;
    }
    
    abstract public function msg($content);
    public function send($to,$content){
        $content = $this->msg($content);
        $this->send->send($to,$content);
    }
}

interface Send {
    public function send($to,$content);
}
class zn implements Send {
    public function send($to,$content){
        echo '站内给' . $to .'，内容是：' . $content;
    }
}

class email implements Send {
    public function send($to,$content){
        echo 'email给' . $to .'，内容是：' . $content;
    }
}

class sms implements Send {
    public function send($to,$content){
        echo '短信给' . $to .'，内容是：' . $content;
    }
}

class commoninfo extends info {
    public function msg($content){
        return '普通' . $content;
    }
}

class warninfo extends info {
    public function msg($content){
        return '紧急' . $content;
    }
}

class dangerinfo extends info {
    public function msg($content){
        return '特急' . $content;
    }
}

//站内发普通信息
$commoninfo = new commoninfo(new zn());
$commoninfo->send('小明','吃饭了');

echo '<br />';
//用手机发特急信息
$dangerinfo = new dangerinfo(new sms());
$dangerinfo->send('小刚','你家失火了');