Codeigniter Interview Question Answer
Codeigniter Feature

It is licensed under MIT so we can use free.
Light weight, all codeignier library,helper very small code so it is also fast.
Codeigniter generate SEO friendly URL.
Codeigniter follow MVC pattern, Means that spearates application logic and presentation parts.

How many type of database supported by codeigniter frameworks?

Mysql
Oracle
PostgreSQL
SQLite

What is the difference between helper and library in codeigniter?

Helper is functions, we are just inclue helper file then we can call function Models,Views and Controllers.But Library is class, we create instance of the class by $this->load->library() then we can call any function in Models,Views and Controllers.

What is the default controller in CodeIgniter?

By default default controller is welcome, we change the default controller

Got application->config->routes.php file

we will see by default codeigniter show welcome

$route['default_controller'] = 'welcome';

here we can change our controller.

What are the hooks in CodeIgniter?

Hook file run before execution of webapplication after execution of the webapplication.

For creating hook there are three steps.

1- Enable hook in application->config->config.php file.
2- Specify code to run on application->config->hooks.php
3- Create php file in application->hook folder

How can we load helper in form?

$this->load->helper('form');
$this->load->helper(array('form', 'url'));

we can also load helper by application/config/autoload.php

$autoload['helpers'] = array('database', 'email', 'session');

Explain CodeIgniter Url Structure

Domain/class/function/querystring

For example

http://www.ittrainingonline.co.in/user/tutorial/codeigniter/81

http://www.ittrainingonline.co.in is a domain
user is a controller name
tutorial is a function name
codigniter and 81 both are querystring value

How to Prevent SQL injection in Codeigniter?

There are three way to prevent SQL injection.

1- Active Record Class
$this->db->get(tablename);

2- Escaping Queries
$query = "select * from info where name=".$this->db->escape($name);
$this->db->query($query);

3- Query Binding
$sql = "select * from info WHERE id=? and name=?";
$this->db->query($sql, array('35', 'shishir sharma'));

List of CodeIgniter Version

CodeIgniter 2 (legacy)

CodeIgniter 3 (current) - Recommended

CodeIgniter 4 (future)

List Databases supported By Codeigniter

MySQL
Oracle
PostgreSQL
SQLite
CUBRID

What is Helper in Codeigniter?

Helper is simply a collection of functions, these function is called procedural functions.
so for use of helper first load helper file

$this->load->helper('helpername');

In Codeigniter there are two type of helper
(a)- User define helper- we create in application->helpers
(b)- Provided by Codeigniter like Form Helper, URL Helper etc.
we can view these helper in system folder.


Next

Share on Facebook
Success Story
Sanjay Kumar
Avatar
Programmer
Falcon software PVT Ltd.
The string functions and HTML platform that we worked on for the PHP codes at IT and DC training institute gave us new avenues to explore and my current job is also due to the new faith in the subject and the knowledge that I have gained by exploring the grounds. I am happy that I joined this institute for the course.
Mamta kushwaha
Avatar
PHP Developer
India webpoint
Many of my relatives were in good jobs than what I had and my parents were worried about me. I was confident to find some way to get a better position. Then I found that the training through It and Dc was happy for the decision. I have my own business now and I am doing good in developing clients’sites to earn profits to make my parents happy.
Sponsored Ads