app VS config

The application is configured section of the params configuration file:

In params.php file you can define the locale identifier:

This ApplicationParameters.php allows you to globally configure some important parameters of your application, such as name and charset, you could also add any parameter you need.

Step 4: We modified our param.php config file.

Step 1: We install the application template to use in this case app .

Add support `SubFolder::class` middleware. by terabytesoftw · Pull Request #269 · yiisoft/app (github.com)

Let’s review this example, to use bootstrap5 in our app template.

**Yii Application Template:** [Template Yii3](https://github.com/yiisoft/app)

App template for Yii Framework v.3, provides a web and console environment, with minimal configuration, to create projects quickly.

Take a look at the configuration, and you'll see that changing it is as simple as changing a parameter in params.php, we've developed the right tools, that will do the job for you, that's simplicity.

Now we understand how to do any configuration of any YiiFramework package or external, it is not necessary to have a single long and complex configuration file, we can organize it according to the group of configurations and Yii config will do the work for you, as well as the container it applies the definitions for you, with the automatic wiring facility in controllers, which makes it easy to access any container dependency without the need to use static access to it, or depend on the container itself.

Now we are going to understand how the definition works inside the .php file, the first thing we do is define the class to configure in our container di, in this case ApplicationParameters::class, the other thing we observe is a comment /** @ var array $params */, here we can see the magic of Yii Config, it automatically allows you to access the parameters defined in the params group, and thus be able to use them in the configuration.

Yii Config 1.0.0