PHP的设计模式总结命令链模式

命令链 模式以松散耦合主题为基础，发送消息、命令和请求，或通过一组处理程序发送任意内容。每个处理程序都会自行判断自己能否处理请求。如果可以，该请求被处理，进程停止。您可以为系统添加或移除处理程序，而不影响其他处理程序。

<?php   
interface icommand{
    function oncommand($name,$arg);
};

class commandchain{
    private $_commands=array();
    public function addCommand($cmd){
        $this->_commands[]=$cmd;
    }
    public function runCommand($name,$args)
    {
        foreach ($this->_commands as $cmd)
        {$cmd->oncommand($name,$args);}
    }
}

class mycommand implements icommand{
    function oncommand($name,$arg){
           if($name=='mytask'){
               echo 'it is my task'.'参数是'.$arg;
           }
        }
    }
    
class yourcommand implements icommand{
        function oncommand($name,$arg){
            if($name=='yourtask'){
                echo 'it is your task'.'参数是'.$arg;
            }
        }
    }
    
$mycom=new mycommand();
$yourcom=new yourcommand();
$comchain=new commandchain();
$comchain->addCommand($mycom);
$comchain->addCommand($yourcom);
$comchain->runCommand('mytask',1);
$comchain->runCommand('yourtask',6);



?> 

代码依旧比较简单。请见谅。