Design-patterns/proxy.php at master · LaughingMeMe/Design-patterns · GitHub

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<?php

//行为型

//代理模式：代理模式跟我们PC上用的代理道理一样，主要是在我们电脑和远程站点之间加了一层代理，可以使访问透明，截取或者代理这两个对象之间的访问,过滤或增强两个对象之间的通信

class cd{

protected $title = null;

protected $band = null;

public function __construct($title,$band){

$this->title = $title;

$this->band = $band;

}

public function buy(){

$sql = 'update num = num - 1 where title = '.$this->title.' and band = '.$this->band;

mysql_query($sql);

}

protected function _connect(){

mysql_connect('A','root','123456');

mysql_select_db('cds');

}

//hangzhoucd,基于代理模式的新对象

class hangzhoucd extends cd{

protected function _connect(){

mysql_connect('B','root','123456');

mysql_select_db('cds');

}