[tpl] Composite

<?php




interface Element{
function prints();

}

class A implements Element{
    function prints(){
    echo 'A element';
    }
}
class B implements Element{
    function prints(){
    echo 'B element';
    }
}
class C implements Element{
    function prints(){
    echo 'C element';
    }
}
class Composite implements Element{
private $list=array();

    function prints(){
        foreach($this->list as $obj){
            if($obj instanceOf Element)$obj->prints();
            else echo $obj;
        }
    }
    function add($e){
        $this->list[]=$e;
    }

}

$c= new Composite();
$c2= new Composite();
$c2->add(1);
$c2->add(new C());

$c->add(new A());
$c->add(new B());

$c2->add($c);


$c2->prints();