04 Templating with Twig

See the documentation of Slim, regarding Templates:

• https://www.slimframework.com/docs/features/templates.html
  • Especially note the path_for() method, which creates a proper link for named routes.

Twig is used by Symfony as well, so have a look at their documentation as well:

• https://twig.symfony.com/
• http://symfony.com/doc/current/templating.html