php设计模式 command (命令模式)

25种php设计模式，你全都知道吗？下面用代码介绍命令模式(command模式)

<?php
/**
 * 命令模式
 *
 * 将一个请求封装为一个对象从而使你可用不同的请求对客户进行参数化,对请求排除或记录请求日志,以及支持可取消的操作
 */
interface Command {
    public function execute();
}
class Invoker {
    private $_command = array();
    public function setCommand($command) {
        $this->_command[] = $command;
    }
    public function executeCommand() {
        foreach ($this->_command as $command) {
            $command->execute();
        }
    }
    public function removeCommand($command) {
        $key = array_search($command, $this->_command);
        if ($key !== false) {
            unset($this->_command[$key]);
        }
    }
}
class Receiver {
    private $_name = null;
    public function __construct($name) {
        $this->_name = $name;
    }
    public function action() {
        echo $this->_name . " action<br/>";
    }
    public function action1() {
        echo $this->_name . " action1<br/>";
    }
}
class ConcreteCommand implements Command {
    private $_receiver;
    public function __construct($receiver) {
        $this->_receiver = $receiver;
    }
    public function execute() {
        $this->_receiver->action();
    }
}
class ConcreteCommand1 implements Command {
    private $_receiver;
    public function __construct($receiver) {
        $this->_receiver = $receiver;
    }
    public function execute() {
        $this->_receiver->action1();
    }
}
class ConcreteCommand2 implements Command {
    private $_receiver;
    public function __construct($receiver) {
        $this->_receiver = $receiver;
    }
    public function execute() {
        $this->_receiver->action();
        $this->_receiver->action1();
    }
}
$objRecevier = new Receiver("No.1");
$objRecevier1 = new Receiver("No.2");
$objRecevier2 = new Receiver("No.3");
$objCommand = new ConcreteCommand($objRecevier);
$objCommand1 = new ConcreteCommand1($objRecevier);
$objCommand2 = new ConcreteCommand($objRecevier1);
$objCommand3 = new ConcreteCommand1($objRecevier1);
$objCommand4 = new ConcreteCommand2($objRecevier2); // 使用 Recevier的两个方法
$objInvoker = new Invoker();
$objInvoker->setCommand($objCommand);
$objInvoker->setCommand($objCommand1);
$objInvoker->executeCommand();
$objInvoker->removeCommand($objCommand1);
$objInvoker->executeCommand();
$objInvoker->setCommand($objCommand2);
$objInvoker->setCommand($objCommand3);
$objInvoker->setCommand($objCommand4);
$objInvoker->executeCommand();

其他相关设计模式：

http://www.phprm.com/develop/memento.html 备忘录模式(Memento模式)
http://www.phprm.com/develop/observer.html 观察者模式(Observer模式)
http://www.phprm.com/develop/template.html 模板方法模式(Template Method模式)
http://www.phprm.com/develop/command.html 命令模式(command模式)
http://www.phprm.com/develop/composite.html 组合模式(composite模式)
http://www.phprm.com/develop/flyweight.html 享元模式(flyweight模式)
http://www.phprm.com/develop/strategy.html 策略模式(strategy模式)
http://www.phprm.com/develop/state.html 状态模式(state模式)
http://www.phprm.com/develop/adapter.html 适配器模式(adapter模式)
http://www.phprm.com/develop/factory.html 工厂模式(factory模式)
http://www.phprm.com/develop/prototype.html 原型模式(prototype模式)
http://www.phprm.com/develop/facade.html 外观模式(facade模式)
http://www.phprm.com/develop/singleton.html 单例模式(singleton模式)
http://www.phprm.com/develop/bridge.html 桥梁模式(bridge模式)
http://www.phprm.com/develop/decorator.html 装饰模式(decorator模式)
http://www.phprm.com/develop/abstract.html 抽象工厂模式(abstract factory模式)
http://www.phprm.com/develop/builder.html 建造者模式(Builder模式)
http://www.phprm.com/develop/visitor.html 访问者模式(Visitor模式)
http://www.phprm.com/develop/interpreter.html 解释器模式(Interpreter模式)
http://www.phprm.com/develop/mediator.html 中介者模式(Mediator模式)
http://www.phprm.com/develop/chain.html 职责链模式(Chain Of Responsibility模式)
http://www.phprm.com/develop/proxy.html 代理模式(Proxy模式)
http://www.phprm.com/develop/interator.html 迭代器模式(Interator模式)
http://www.phprm.com/develop/dao.html 数据访问对象模式(DAO模式)
http://www.phprm.com/develop/delegation.html 委托模式(Delegation模式)

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