Using the configuration file, explain what can be configured.

<?php
 
// uncomment the following to define a path alias
// Yii::setPathOfAlias('local','path/to/local-folder');
 
// This is the main Web application configuration. Any writable
// CWebApplication properties can be configured here.
return array(
 
    // the base path to the protected folder
    // access it using Yii::app()->basePath
    'basePath'=>dirname(__FILE__).DIRECTORY_SEPARATOR.'..',
 
    // name of application
    // access it using Yii::app()->name
    'name'=>'My website',
 
    //aliases to specify shortcuts for paths in your app or
      // perhaps to external resources for your app
      'aliases'=>array(
            'myExternalFramework'=>dirname(__FILE__).DIRECTORY_SEPARATOR.'..'
            .DIRECTORY_SEPARATOR.'..'.DIRECTORY_SEPARATOR.'myexternalframework'
        ),
 
        //building on above for a controller in the external 
        //framework you can use the controller map to map the 
        //controller path
        'controllerMap'=>array('myController'=>'myExternalFramework.controllers.MyController'),
 
        // default controller that will be executed when running the application
    'defaultController'=>'site', 
 
    // user language (for Locale)
    'language'=>'es',
 
        //language for messages and views
        'sourceLanguage'=>'es',
 
    // charset to use
    'charset'=>'utf-8',
 
    // preloading application components
    'preload'=>array('log'),
 
    // autoloading classes
    'import'=>array(
        'application.models.*',
        'application.components.*',
    ),
 
    // application-level parameters that can be accessed
    // using Yii::app()->params['paramName']
    'params'=>array(
        'adminEmail'=>'info@example.com',
    ),
 
    // Note: you can also separate your configuration file into
    // more files, for example: db.php, params.php and so on.
    // You can do it like this example:
    // 'params'=>require(dirname(__FILE__).'/params.php'),
    // and inside the params.php you will return the array:
    // return array('adminEmail'=>'info@example.com');
 
    // configuration of application components
    'components'=>array(
 
        // assets, see http://www.yiiframework.com/doc/api/CAssetManager
        'assetManager'=>array(
            // change the path on disk
            'basePath'=>dirname(__FILE__).'/../../assets/',
            // change the url
            'baseUrl'=>'/web/assets/'
        ),
 
        // logging
        'log'=>array(
            // class of logger
            'class'=>'CLogRouter', 
            // where to store logs?
            'routes'=>array( 
                array(
                    // store on file, other options are available
                    'class'=>'CFileLogRoute', 
                    // what to store on file? error and warning, info and trace can be added here
                    'levels'=>'error, warning', 
                ),
            ),
        ),
 
        // user
        'user'=>array(
            // enable cookie-based authentication
            'allowAutoLogin'=>true,
            // set the url where user must be redirected if authentication needed
            // use null to force 403 HTTP error 
            'loginUrl'=>null,
            // set here the name of a class
            // that extends CWebUser and it is stored in
            // protected/components/<classname>
            // see: http://www.yiiframework.com/doc/cookbook/60/
            'class' => 'WebUser',
        ),
 
        // database
        'db'=>array(
            // using mysql
            'connectionString'=>'mysql:host=example.com;dbname=my_db',
            'username'=>'my_user',
            'password'=>'my_password',
            // set the charset of the connection
            'charset'=>'utf8',
            // using sqlite
            // 'connectionString'=>'sqlite:'.dirname(__FILE__).'/../data/blog.db',
            //'charset'=>'utf8',
            'schemaCachingDuration'=>'duration in seconds',
        ),
 
        // caching
        'cache'=>array(
            'class'=>'A cache class, like: system.caching.CApcCache',
        ),
 
        // url 
        'urlManager'=>array(
            // the URL format. It must be either 'path' or 'get'.
            // path: index.php/controller/action/attribute/value
            // get: index.php?r=controller/action&attribute=value
            'urlFormat'=>'path',
            // show www.example.com/index.php/controller/action 
            // or just www.example.com/controller/action
            'showScriptName' => true,
            // rules to redirect a specific url to the controller you want
            // see: http://www.yiiframework.com/doc/guide/topics.url
            'rules'=>array(
                // www.example.com/home instead of www.example.com/site/index
                'home'=>'site/index',
                'post/<id:\d+>'=>'post/show',
            ),
        ),
                // you can use the scriptMap to configure where your scripts come from. 
                //If you use the split configurations for development and production you can 
                // have different maps in each and then just load the file and it'll
                // load the appropriate file depending on the configuration your running.
                // for a production configuration you can have this
                'clientScript'=>array(
                      'scriptMap'=>array(
                          'register.js'=>'site.min.js',
                          'login.js'=>'site.min.js',
                      ),
                ),
                // for a development configuration you can have this
                'clientScript'=>array(
                      'scriptMap'=>array(
                          'register.js'=>'register.js',
                          'login.js'=>'login.js',
                      ),
                ),
    ),
);
?>