本文实例讲述了PHP设计模式之组合模式定义与应用。分享给大家供大家参考，具体如下：
<?php
/**
* 组合模式
*
* 将对象组合成树形结构以表示"部分-整体"的层次结构,使得客户对单个对象和复合对象的使用具有一致性
*/
abstract class MenuComponent
{
public function add($component)
{
}
public function remove($component)
{
}
public function getName()
{
}
public function getUrl()
{
}
public function display()
{
}
}
class Menu extends MenuComponent
{
private $_items = array();
private $_name = null;
public function __construct($name)
{
$this->_name = $name;
}
public function add($component)
{
$this->_items[] = $component;
}
public function remove($component)
{
$key = array_search($component, $this->_items);
if ($key !== false) unset($this->_items[$key]);
}
public function display()
{
echo "-- " . $this->_name . " --------- rn ";
foreach ($this->_items as $item) {
$item->display();
}
}
}
class Item extends MenuComponent
{
private $_name = null;
private $_url = null;
public function __construct($name, $url)
{
$this->_name = $name;
$this->_url = $url;
}
public function display()
{
echo $this->_name . "#" . $this->_url . " rn ";
}
}
class Client
{
private $_menu = null;
public function __construct($menu)
{
$this->_menu = $menu;
}
public function setMenu($menu)
{
$this->_menu = $menu;
}
public function displayMenu()
{
$this->_menu->display();
}
}
// 实例一下
// 人
$item3 = new Item("bAIdu", "www.baidu.com");
$item4 = new Item("google", "www.google.com");
$item1 = new Item("163", "www.163.com");
$item2 = new Item("sina", "www.sina.com");
// 班级
$subMenu1 = new Menu("sub menu1");
$subMenu1->add($item1);
$subMenu1->add($item2);
$subMenu2 = new Menu("sub menu2");
$subMenu2->add($item3);
$subMenu2->add($item4);
$subMenu3 = new Menu("sub menu3");
$subMenu3->add($item3);
$subMenu3->add($item4);
// 所有班级
$allMenu = new Menu("All Menu");
$allMenu->add($subMenu1);
$allMenu->add($subMenu2);
$allMenu->add($subMenu3);
// 打印所有班级
$objClient = new Client($allMenu);
$objClient->displayMenu();
// 打印第2 班级
$objClient->setMenu($subMenu2);
$objClient->displayMenu();
?>
运行结果：
-- All Menu ---------
-- sub menu1 ---------
163#www.163.com
sina#www.sina.com
-- sub menu2 ---------
baidu#www.baidu.com
google#www.google.com
-- sub menu3 ---------
baidu#www.baidu.com
google#www.google.com
-- sub menu2 ---------
baidu#www.baidu.com
google#www.google.com
