使用PHP实现命令模式（转）

<?php
/**
 * 命令模式 2010-08-21 sz
 * @author phppan.p#gmail.com  http://www.phppan.com                                                       
 * 哥学社成员（http://www.blog-brother.com/）
 * @package design pattern
 */
 
/**
 * 命令角色
 */
interface Command {
 
    /**
     * 执行方法
     */
    public function execute();
}
 
/**
 * 具体命令角色
 */
class ConcreteCommand implements Command {
 
    private $_receiver;
 
    public function __construct(Receiver $receiver) {
        $this->_receiver = $receiver;
    }
 
    /**
     * 执行方法
     */
    public function execute() {
        $this->_receiver->action();
    }
}
 
/**
 * 接收者角色
 */
class Receiver {
 
    /* 接收者名称 */
    private $_name;
 
    public function __construct($name) {
        $this->_name = $name;
    }
 
    /**
     * 行动方法
     */
    public function action() {
        echo $this->_name, ‘ do action.<br />‘;
    }
}
 
/**
 * 请求者角色
 */
class Invoker {
 
    private $_command;
 
    public function __construct(Command $command) {
        $this->_command = $command;
    }
 
    public function action() {
        $this->_command->execute();
    }
}
 
/**
 * 客户端
 */
class Client {
 
     /**
     * Main program.
     */
    public static function main() {
        $receiver = new Receiver(‘phpppan‘);
        $command = new ConcreteCommand($receiver);
        $invoker = new Invoker($command);
        $invoker->action();
    }
}
 
Client::main();
 
?>