Explain request Life Cycle in Yii2 framework.

When handling a user request, Yii 2.0 application will undergo the following stages:

1. Pre-initialize the application with CApplication::preinit();
2. Set up the error handling;
3. Register core application components;
4. Load application configuration;
5. Initialize the application with CApplication::init()
   • Register application behaviors;
   • Load static application components;
6. Raise an onBeginRequest event;
7. Process the user request.
   • Collect information about the request;
   • Create a controller;
   • Run the controller;
8. Raise an onEndRequest event;