code: static public function render($template, $userData)
      {
          if (!is_string($template)) return '';
          $path = strlen($template) <= 256 ? trim($template) : '';
          $data = array_merge(Tpl::$data, is_array($userData) ? $userData : []);
          $twig = TwigEnv::instance();
  
          // treat template as a path only if it *looks like* a Twig template path
          if (Str::startsWith($path, '@') || Str::endsWith(strtolower($path), '.twig')) {
              return $twig->renderPath($path, $data);
          }
          return $twig->renderString($template, $data);
      }
docs: Renders a Twig template string or template file
  Can be used in Kirby controllers and PHP templates
  
  * Example usage:
  
  <?php echo twig('Hello {{ who }}', ['who'=>'World']) ?>
  <?php echo twig('@snippets/header.twig', ['title'=>'Home page']) ?>
  
  Note: in Twig templates, you should use the `include` tag or function instead.
  
  @param string $template - path or template string to render
  @param array  $userData - data to pass as variables to the template
  @return string