PHP设计模式之组合模式与案例分享-tutorial php-php.cn

PHP设计模式之组合模式与案例分享

小云云

Lepaskan： 2023-03-21 08:56:01

asal

1346 orang telah melayarinya

组合模式能让客户以一致的方式处理个别对象以及组合对象。组合模式让客户端像修改配置文件一样简单的完成递归的动作，免除了客户端的逻辑思考。将对象组合成树状结构以表示‘部分-整体’的层次结构。

PHP案例：

导航目录的添加与删除：

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=&#39;&#39;;
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();

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