PHP design pattern combination pattern and case sharing

The composition pattern enables clients to handle individual objects as well as composite objects in a consistent manner. The combination mode allows the client to complete recursive actions as simply as modifying the configuration file, eliminating the need for the client to think logically. Group objects into a tree structure to represent a 'part-whole' hierarchy.

PHP case:

Adding and deleting navigation directories:

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();

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