Question:What is Yii framework? 

Yii is a very flexible and high-performance application development framework written in PHP. It helps building web applications, from small to large-scale enterprise applications. The framework name stands for Yes It Is (Yii).          Page: 5

Question:What are the features of yii framework? 

Features fo Yii are : 
i. Model-View-Controller (MVC) design pattern
ii. Database Access Objects (DAO), Query Builder, Active Record, DB Migration
iii. Form input and validation
iv. AJAX-enabled widgets
v. Unit and functionality testing
vi. Friendly with third-party code

Question:What is MVC?/ Explain about model, view, controller? 

: Elaboration of MVC  is Model View Controller. It is a pattern for building application. The Model represents the application core (for instance a list of database records). The View displays the data (the database records) and The Controller is the business logic.

Question:What is the first function that gets loaded from a controller? 

The first function that gets loaded from a controller is index(). 
example:
Public  function actionIndex()
{
 /* write code here*/
}

Question:How to connect to the database in YII? 

To connect a database, you have  to edit the database .php file which is at yii\protected\config\database.php:

<?php
	'connectionString' => 'mysql:host=localhost;dbname=yii116',
	'emulatePrepare' => true,
	'username' => 'root',
	'password' => '',
	'charset' => 'utf8',	
);

Question:How to enable gii in yii? 

To enablel gii in yii we should edit ‘modules’ after entering yii\protected\config\main.php . Snippet are showing belows:

'modules'=>array(
		'gii'=>array(
			'class'=>'system.gii.GiiModule',
			'password'=>’type password’,
			'ipFilters'=>array('127.0.0.1','::1'),
		),

Question:How to enable url manager in yii? 

url manager remains in yii\protected\config\main.php. We can enable after un commenting ‘urlManager’ and the codes will show like:
'urlManager'=>array(
			'urlFormat'=>'path',
			'showScriptName'=>false,
			'rules'=>array(
				'<controller:\w+>/<id:\d+>'=>'<controller>/view',
				'<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',
				'<controller:\w+>/<action:\w+>'=>'<controller>/<action>',
			),
		),

Question:Discuss the controller and its method convention in yii. 

: A controller is an instance of CController or of a class that extends CController. It is created by the application object when the user requests it.

controller convention:  The ControllerID in CamelCase suffixed with ‘Controller’ ex. SiteController, where Site is the ControllerID.

Method convention:  camelCase with first letter lowercase like getProperty(),actionCreate().Ex:
public function actionCreate()
            { 
block of statement
             }

Question:What is component in yii? 

Yii applications are built upon components which are objects written to a specification. A component is an instance of CComponent or its derived class. Using a component mainly involves accessing its properties and raising/handling its events.  
Example:  CDbConnection this component provides a database connection.
[page#25(pdf),  http://www.yiiframework.com/doc/guide/1.1/en/basics.component]

Question:How many ways you can work with database in yii? Discuss. 

Yii has several types of database support those are 
 a. SQL via DAO
 b. query builder
 c. Active Record