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https://github.com/yiisoft/yii2/issues/3647

By default Yii comes with advanced application template that allows you to properly structure backend and frontend. It's a good way to deal with the problem except when you want to redistribute parts of your application. In this case a better way is to use modules.

Directory structure

common
  components
  models
backend
  controllers
  views
  Module
frontend
  controllers
  views
  Module

Namespaces

Root namespace is the same as in any extension i.e. samdark\blog (PSR-4 record required in composer.json). Common stuff is under samdark\blog\common. Backend module is samdark\blog\backend\Module, frontend module is samdark\blog\frontend\Module.

Using it

• Install via Composer.
• In your application config use modules:

'modules' => [
  'blogFrontend' => [
    'class' => 'samdark\blog\frontend\Module',
    'anonymousComments' => false,
  ],
  'blogBackend' => [
    'class' => 'samdark\blog\backend\Module',
  ],
]

• Access via browser:

http://example.com/blog-frontend/post/view?id=10
http://example.com/blog-backend/user/index