Using Parameters in Routes

You can use parameters from parameters.yml in routes. There are serveral use-cases when this may be useful.

Let’s say you want to localize your routes but you want to store the list of available locales only once. Then you could define a parameter in config.yml:

parameters:
    allowed_locales: en|de|fr

Now you can use the parameter in your routing.yml:

some_bundle:
    resource: "@MyBundle/Controller/"
    prefix:   /{_locale}
    type:     annotation
    requirements:
        _locale: %allowed_locales%

Another use-case is routes based on a hostname. Instead of writing the hostname directly into routing.yml you could use a parameter, as seen in the official documentation.

As fas as I know parameters only work for routes defined in YAML, XML or PHP. If it also works for annotation routes, please let me know.