PHP 组件注册的例子

<?php
namespace  Test;

abstract class Plugin
{
    protected $pluginName = null;

    abstract public function action();

    function toString()
    {
        return $this->pluginName;
    }
}

class HandPlugin extends Plugin
{
    protected $pluginName ;

    function __construct($name = 'Hand')
    {
        $this->pluginName = $name;
    }

    public function action()
    {
        // TODO: Implement action() method.
        echo 'Raise your hand!' ."\n";
    }
}

class FootPlugin extends Plugin
{
    protected $pluginName ;

    function __construct($name = 'Foot')
    {
        $this->pluginName = $name;
    }

    public function action()
    {
        // TODO: Implement action() method.
        echo 'Put down your foot!' ."\n";
    }
}


class People
{
    protected $bodyPlugin = array();
    protected $giveName = null;

    public function __construct($name ='Fully Man')
    {
        $this->giveName = $name;
    }

    public function register(Plugin $plugin)
    {
        if(!isset($this->bodyPlugin[$plugin->toString()]))
        {
            $this->bodyPlugin[$plugin->toString()] = $plugin;
        }
        else
        {
            return true;
        }
    }

    public function unRegister(Plugin $plugin)
    {
        if(isset($this->bodyPlugin[$plugin->toString()]))
        {
            unset($this->bodyPlugin[$plugin->toString()]);
        }
        return true;
    }

    public function doBodyAction()
    {
        if(empty($this->bodyPlugin))
        {
            echo 'Nothing to show!' ."\n";
            return false;
        }

        echo $this->giveName. " will do :\n";
        foreach($this->bodyPlugin as $name => $plugin)
        {
            echo $name. ": " ;
            echo $plugin->action();
        }
    }
}

$handPlugin = new HandPlugin();
$footPlugin = new FootPlugin();
$people = new People();

$people->register($handPlugin);
$people->register($footPlugin);

$people->doBodyAction();