set_default_bool("holiday_aprilfools", false); } public function onSetupBuilding(SetupBuildingEvent $event): void { $sb = $event->panel->create_new_block("Holiday Theme"); $sb->add_bool_option("holiday_aprilfools", "Enable April Fools"); } public function onPageRequest(PageRequestEvent $event): void { global $config, $page; if (date('d/m') == '01/04' && $config->get_bool("holiday_aprilfools")) { $page->add_html_header( "" ); } } }