<?phpnamespace Customize\EventSubscriber;use Eccube\Event\TemplateEvent;use Symfony\Component\EventDispatcher\EventSubscriberInterface;class ProductSubscriber implements EventSubscriberInterface{ /** * @inheritDoc */ public static function getSubscribedEvents() { return [ '@admin/Product/product.twig' => 'onTemplateAdminProduct' ]; } public function onTemplateAdminProduct(TemplateEvent $event) { $event->addSnippet('@admin/Product/product_customize.twig'); }}