组合模式（Composite Pattern）有时候又叫做部分-整体模式，用于将对象组合成树形结构以表示“部分-整体”的层次关系。组合模式使得用户对单个对象和组合对象的使用具有一致性。
常见使用场景：如树形菜单、文件夹菜单、部门组织架构图等。
<?php/** * ?*安全式合成模式 */interface Component { ???public function getComposite(); //返回自己的实例 ???public function operation();}class Composite implements Component { // 树枝组件角色 ???private $_composites; ???public function __construct() { $this->_composites = array(); } ???public function getComposite() { return $this; } ????public function operation() { ????????foreach ($this->_composites as $composite) { ???????????$composite->operation(); ???????} ????} ???public function add(Component $component) { ?//聚集管理方法 添加一个子对象 ???????$this->_composites[] = $component; ???} ???public function remove(Component $component) { // 聚集管理方法 删除一个子对象 ???????foreach ($this->_composites as $key => $row) { ???????????if ($component == $row) { unset($this->_composites[$key]); return TRUE; } ???????} ????????return FALSE; ???} ???public function getChild() { // 聚集管理方法 返回所有的子对象 ??????return $this->_composites; ???}}class Leaf implements Component { ???private $_name; ????public function __construct($name) { $this->_name = $name; } ???public function operation() {} ???public function getComposite() {return null;}}// client$leaf1 = new Leaf(‘first‘);$leaf2 = new Leaf(‘second‘);$composite = new Composite();$composite->add($leaf1);$composite->add($leaf2);$composite->operation();$composite->remove($leaf2);$composite->operation();/** * ?*透明式合成模式 */interface Component { // 抽象组件角色 ???public function getComposite(); // 返回自己的实例 ???public function operation(); // 示例方法 ???public function add(Component $component); // 聚集管理方法,添加一个子对象 ???public function remove(Component $component); // 聚集管理方法 删除一个子对象 ???public function getChild(); // 聚集管理方法 返回所有的子对象}class Composite implements Component { // 树枝组件角色 ???private $_composites; ???public function __construct() { $this->_composites = array(); } ????public function getComposite() { return $this; } ???public function operation() { // 示例方法，调用各个子对象的operation方法 ???????foreach ($this->_composites as $composite) { ???????????$composite->operation(); ???????} ???} ???public function add(Component $component) { // 聚集管理方法 添加一个子对象 ???????$this->_composites[] = $component; ???} ???public function remove(Component $component) { // 聚集管理方法 删除一个子对象 ???????foreach ($this->_composites as $key => $row) { ???????????if ($component == $row) { unset($this->_composites[$key]); return TRUE; } ???????} ????????return FALSE; ???} ???public function getChild() { // 聚集管理方法 返回所有的子对象 ??????return $this->_composites; ???}}class Leaf implements Component { ???private $_name; ???public function __construct($name) {$this->_name = $name;} ???public function operation() {echo $this->_name."<br>";} ???public function getComposite() { return null; } ???public function add(Component $component) { return FALSE; } ???public function remove(Component $component) { return FALSE; } ???public function getChild() { return null; }}// client $leaf1 = new Leaf(‘first‘);$leaf2 = new Leaf(‘second‘);$composite = new Composite();$composite->add($leaf1);$composite->add($leaf2);$composite->operation();$composite->remove($leaf2);$composite->operation();?>PHP设计模式 - 合成模式
原文地址：https://www.cnblogs.com/taozi32/p/9226544.html