Request Flow

Every application follows the same flow:

1. Application starts from index.php.
   1. The application, module, and system paths are set. (APPPATH, MODPATH, and SYSPATH)
   2. Error reporting levels are set.
   3. Install file is loaded, if it exists.
   4. The bootstrap file, APPPATH/bootstrap.php, is included.
2. Once we are in bootstrap.php:
   1. The Kohana class is loaded.
   2. Kohana::init is called, which sets up error handling, caching, and logging.
   3. Kohana_Config readers and Kohana_Log writers are attached.
   4. Kohana::modules is called to enable additional modules.
      • Module paths are added to the cascading filesystem.
      • Includes each module's init.php file, if it exists.
      • The init.php file can perform additional environment setup, including adding routes.
   5. Route::set is called multiple times to define the application routes.
   6. Request::instance is called to start processing the request.
      1. Checks each route that has been set until a match is found.
      2. Creates the controller instance and passes the request to it.
      3. Calls the Controller::before method.
      4. Calls the controller action, which generates the request response.
      5. Calls the Controller::after method.
         • The above 5 steps can be repeated multiple times when using HMVC sub-requests.
3. Application flow returns to index.php
   1. The main Request response is displayed