組合模式能讓客戶以一致的方式處理個別物件以及組合物件。組合模式讓客戶端像修改設定檔一樣簡單的完成遞歸的動作，免除了客戶端的邏輯思考。將物件組合成樹狀結構以表示‘部分-整體’的層次結構。
PHP案例：
導航目錄的新增與刪除：
header("Content-type:text/html; charset=utf-8");
abstract class Component {
abstract function addNode(Component $obj);
abstract function removeNode(Component $obj);
abstract function show($str);
}
class Branch extends Component {
public $name='';
public $childNode = array();
public function __construct($name)
{
$this->name = $name;
}
public function addNode(Component $obj) {
// $this->childNode[] = $obj;
array_push($this->childNode,$obj);
}
public function removeNode(Component $obj) {
$key = array_search($obj, $this->childNode);
unset($this->childNode[$key]);
}
public function show($str="") {
echo $this->name."<br>";
$str.=" |- ";
foreach ($this->childNode as $val) {
echo $str;
$val->show($str);
}
}
}
class Leaf extends Component {
public $name;
public function __construct($name) {
$this->name = $name;
}
function addNode(Component $obj) {
return false;
}
function removeNode(Component $obj) {
return false;
}
function show($str="") {
echo $this->name."<br>";
}
}
$branch1 = new Branch("家电类");
$leaf11 = new Leaf("电饭煲");
$leaf12 = new Leaf("电冰箱");
$leaf13 = new Leaf("洗衣机");
$branch1->addNode($leaf11);
$branch1->addNode($leaf12);
$branch1->addNode($leaf13);
$branch2 = new Branch("电脑类");
$branch21 = new Branch("台式机");
$branch22 = new Branch("笔记本");
$leaf221 = new Leaf("华硕");
$leaf222 = new Leaf("联想");
$leaf223 = new Leaf("华为");
$leaf224 = new Leaf("华夏");
$branch22->addNode($leaf221);
$branch22->addNode($leaf222);
$branch22->addNode($leaf223);
$branch22->addNode($leaf224);
$branch2->addNode($branch21);
$branch2->addNode($branch22);
$branch1->addNode($branch2);
$branch1->show();相關推薦：
#相關推薦：
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