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To install the Yii FRAMEWORK, your SERVER requires PHP 5.4 or higher VERSION, mbstring EXTENSION, and PCRE-support

You can get the current CONTROLLER NAME by:
//Controller Name
ECHO YII::$app->controller->id;

You can get current action name by:
echo Yii::$app->controller->action->id;

Gii is one of the most POWERFUL web-based, code-generator MODULES in the Yii Framework. It HELPS the DEVELOPERS in creating fully-customized forms and models for databases.

To get the IP address of a user within the Yii Framework, the following code can be used:
echo Yii::app()->request->userHostAddress;
You can call this code from anywhere within your Yii application.

This information was frequently ASKED during Yii interview questions for experienced professionals.

The Yii Framework provides many classes that SIMPLIFY COMMON coding tasks like ARRAY MANIPULATION, code generation, etc. These are called HELPER classes. These can be found under yii\helpers. These classes are static, which means they merely contain static methods and should never be instantiated.

In YII, a component is an independent code written for a particular TASK which can be used by SUMMONING CONTROLLERS. An example of ELEMENTS is an email component.

Table prefix is defined USING Gii by setting to tbl_. Once you set it, UserController will get generated instead of TblUserController.

The Yii Framework INCLUDES a class naming convention in which the NAMES of classes MAP to the directories where they are stored. For your information, “framework/” directory is the root LEVEL directory of Yii that stores all classes hierarchically. Also, in Yii, the class names may contain only alphanumeric characters. Though numbers are allowed but are discouraged. You can use Dot (.) just in place of path separators.

In any Yii APPLICATION, you need to open the main.php file in the protected/config/main.php folder. Now SEARCH for the "DB" parameter. In this parameter, you can add the DATABASE NAME, hostname, username, and password for your database server.

Yii is not developed by a single individual. A strong team of CORE developers and an ONLINE COMMUNITY of professionals has been contributing to this FRAMEWORK's DEVELOPMENT.

YII 2.0

Reading our VAST question bank will make it easy for you to crack the Yii BASIC interview QUESTIONS.

Yii is a component-based, high-performance PHP framework for developing extensive Web APPLICATIONS quickly. Yii ENABLES maximum reusability in PROGRAMMING and significantly accelerates the process of web application DEVELOPMENT.

$database1 = $this->LOAD->DATABASE('DB1', TRUE); // Connect with database 1
$database2 = $this->load->database('DB2', TRUE); // Connect with database 2

We can USE the redirect() FUNCTION to redirect on any page.

$this->load->helper('URL');       // FIRSTLY you have to load url helper.
if (condition != TRUE) {
    redirect('login_page');
}

Step 1. MAKE /application/logs LOG folder writable
Step 2. Set $config['log_threshold'] = 1; in /application/config/config.php

// TRUNCATE table ADMIN;
You can USE this to truncate table
$this->db->from('admin'); // select admin table
$this->db->truncate(); // truncate admin table

OR

You can ALSO use LIKE this
$this->db->truncate('admin'); // truncate admin table

You can use $this->db->delete('ADMIN', array('id' => 5)); this query to delete RECORD according to CONDITION
// DELETE FROM admin WHERE id = 5

You can USE this $this->router->fetch_class(); to GET current controller name.
You can use this $this->router->fetch_method(); to get current METHOD.

You can USE $this->INPUT->ip_address(); this to get IP Address.

To SET CONFIG VALUE $this->config->set_item('mainURL','bestinterviewquestion.com'); we can use this.

To GET config value $this->config->set_item('mainURL'); we can use this.

$this->DB->JOIN('blog', 'comment.blog_id= blog.id', 'inner');

OR

$this->db->join('blog', 'comment.blog_id= blog.id');

You can USE $LASTINSERTID = $this->db->insert_id(); after INSERT query.

You can create your custom 404 page with these steps. Please follow these steps one by one.

• You have to update your own created CONTROLLER's class with $route['404_override'] = 'Controller_Class_Name';. You have to update this in your application/config/routes.php
• Please create your new controller "Controller_Class_Name" file in your controllers directory application/controllers/.
• Please put this code in your Controller_Class_Name.php
  
  class Controller_Class_Name extends CI_Controller {
       public function __construct() {
            parent::__construct();
       }
  
      public function index() {
           $this->output->set_status_header('404');
           $this->LOAD->VIEW('error_page_404');
      }
  }
• Now create your "error_page_404" view file.

You can use $this->db->insert(); to insert data in your database in Codeigniter.

If you want to insert this in your "Admin Table".

$dataArray = array(
       'name'=>'bestinterviewquestion.com',
       'phone'=>'9971083635',
       'email'=>'[email protected]'
);

$this->db->insert('Admin',$dataArray);

// Here "Admin" is My TableName

You can USE $this->db->last_query(); to display the QUERY string.
You can use print_r($query); to display the query RESULT.

In CodeIgniter drivers are a very special type of Library that has a parent class and its child CLASSES. Child classes have the ACCESS to its parent class but not their siblings. It provides an elegant syntax in your controllers file for libraries.

It can FOUND in the system/libraries/ directory.

If we want to use a DRIVER we have to initialize it within a CONTROLLER with this given method.
$this->load->driver('class_name');

Here class_name is the name of the driver class which we want to invoke.

• You can create your own driver folder in /application/libraries/
• Create your_Your_Driver_name.php file in /application/libraries/Your_Driver
• In /application/libraries/Your_Driver/drivers
  • Your_Driver_name_subclass_1.php
  • Your_Driver_name_subclass_2.php

If you WANT to ENABLE hooks then you have to enabled/disabled by setting in the application/CONFIG/config.php file.

If you want to enable hooks then use this $config['enable_hooks'] = TRUE;

You have to pass your helpers in array form. Here helper_1, helper_2, helper_3, helper_4 are different helpers that we WANT to LOAD.

$this->load->helper(
    array('helper_1', 'helper_2', 'helper_3', 'helper_4')
);

We need only PHP version 5.6 or GREATER than 5.6. because of POTENTIAL security and performance ISSUES.

CodeIgniter can be INSTALLED with FOUR steps that are given below:

• Download it from its download page & then unzip the package.
• Upload its FILES and folders on your server or localhost.
• Open application/config/config.php file and set base URL.
• If you want to use DATABASE then open application/config/database.php file and set your database credientails.
• Now it's installed

If you want to CONFIGURE additional setting then you can click here

It is called as loosely BASED mvc framework because in codeigniter controller is the necessary but model and view are OPTIONAL. It means we can build a WEBSITE WITHOUT model.

How to add values in session in Codeigniter

$_SESSION['username'] = 'bestinterviewquestion.com' // It can be use in core PHP
$this->session->set_userdata('username', 'bestinterviewquestion.com'); // It can be DONE in Codeigniter

We can pass array to store values in session in Codeigniter.

$array = array(
    'username' => 'bestinterviewquestion.com',
    'email' => '[email protected]',
    'url' => 'https://www.bestinterviewquestion.com'
);

$this->session->set_userdata($array);

unset($_SESSION['username']); // It can be use in core PHP
$this->session->unset_userdata('username'); // It can be done in Codeigniter

If we WANT to remove more values from session then we can use like this

$this->session->unset_userdata($array);  // $array is DEFINED above. It is an array with KEY & values.

$this->session->userdata('username'); // Here we will get username, if it is exists in session.

Codeigniter PROVIDES a rich SET of libraries, which indirectly INCREASE the speed of developing an application. These Codeigniter system library is located in system/libraries.

In Codeigniter the library can be LOADED with $this->load->library('class name');

If we WANT to load multiple libraries then we can use like $this->load->library(array('comment', 'blog'));

In codeIgniter CSRF token is a random generated value that CHANGES with each HTTP request SENT by webform. When the form is submitted by user then WEBSITE CHECKS this submitted CSRF token equals or not the saved in the session.

We can enable CSRF protection from config.php and UPDATE the following values

$config['csrf_protection'] = TRUE;
$config['csrf_token_name'] = 'csrf_test_name'; //The token name
$config['csrf_cookie_name'] = 'csrf_cookie_name'; //The cookie name
$config['csrf_expire'] = 7200; // It will expire after this given time.

You can FOLLOW these given STEPS to remove index.php from URL in Codeigniter.

• Please open config.php and change from $config['index_page'] = "index.php" to $config['index_page'] = "";
• Update also from $config['uri_protocol'] ="AUTO"; to $config['uri_protocol'] = "REQUEST_URI";
• Put this code in your htaccess file
  RewriteEngine on
  RewriteCond $1 !^(index\.php|resources|robots\.txt)
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*)$ index.php/$1 [L,QSA]

Inhibitor is an error HANDLING CLASS. It is USING the native PHP functions like set_error_handler, set_exception_handler, register_shutdown_function to handle all error's like PARSE errors, exceptions, and fatal errors.

We can use an absolute path to RESOURCES to link images/CSS/JavaScript from a view in CodeIgniter.

For Example :

&LT;link REL = "stylesheet" type = "text/css" HREF = "<?php echo base_url(); ?>css/responsive.css">
<script type = 'text/javascript' SRC = "<?php echo base_url(); ?>js/jquery.js"></script>

CODEIGNITER supports various HOOK points.

• post_controller_constructor
• pre_controller
• post_sytem
• pre_system
• cache_override
• display_override
• post_controller

If you are scrolling on the web for Codeigniter interview questions for 2 year EXPERIENCE pdf, then this GUIDE will gonna HELP you.

It is the process of taking a URI endpoint and decomposing it into parameters to DETERMINE module controller and ACTION of that controller should receive the request.

CODEIGNITER has a USERFRIENDLY URI routing rule so that we can re-route URL easily . There is a one-to-one relationship between a URL string and its corresponding controller class and its methods.

Routing is a technique through which we can converts SEO friendly URLs into a server code format that easily understandable.

We can manage these from routes.php file at the located in application/config.

It is a globally available METHODS or functions that returns the Controller super-object which contains all the currently loaded CLASSES. get_instance() function  returns the Controller CLASS INSTANCE.

Helper is a set of COMMON FUNCTIONS which we can use within Models, VIEWS, Controllers everywhere. Once we include that file then we can get access to the functions.
Library is a class which we need to make an instance of the class by $this->load->library() this function.

NOTE : A library is used in object-oriented context but a helper is more SUITABLE to be used within the Views

Helpers is collection of functions which help us with different tasks as name suggested. Every helper function is used to performs specific task with no DEPENDENCE on other functions.

CodeIgniter provide various types of helper CLASS like url_helper, captcha_helper ,email_helper. All these helpers are located in system/helper.

By default CodeIgniter does not load any Helper files. First step is to be load Helper. After loaded it is AVAILABLE in all controller and views.

How we can load a Helper : $this->load->helper('name');
Here "name" is file name of helper.

How to load multiple Helpers at ONE time.
$this->load->helper(array('helper1', 'helper2', 'helper3')); // Here helper1,helper2,helper3 are different helper's name.

The BASIC URL STRUCTURE is bestinterviewquestion.com/class/function/ID.

Here class represents controller's class that NEEDS to be invoked.
Here "function" is name of method which is called.
ID is an additional parameter that is passed to CONTROLLERS.

In CodeIgniter when a specified file in the default controller loaded by default when there is no file name mentioned in URL. By default "welcome.php" file is loaded after installing CodeIgniter.

Yes, we can CHANGE it from application/config/routes.php. We have to pass our controller name which we want to LOAD by default in $route['default_controller']

For EXAMPLE, now the frontend is the default controller $route['default_controller'] = 'Frontend'; from now. Interview questions on Codeigniter are always a LEVEL up and thus a little tough to crack.