[PHP] 组合模式-结构型设计模式

interface Renderable
{
    public function render(): string;
}

class Form implements Renderable
{
    private array $elements;
    public function render(): string
    {
        //组合类里面循环调用其他类的同名方法
        foreach ($this->elements as $element) {
            $element->render();
        }
    }
    public function addElement(Renderable $element)
    {
        $this->elements[] = $element;
    }
}

class InputElement implements Renderable
{
    public function render(): string
    {
    }
}
class TextElement implements Renderable
{
    public function render(): string
    {
    }
}

$form = new Form();
$form->addElement(new TextElement());
$form->addElement(new InputElement());
$form->render();