Latest CodeIgniter interview questions and answers

 



Are you looking jobs in CodeIgniter? Then you are at the right place. We provide you with the best CodeIgniter interview Question and Answers in this article blog. CodeIgniter is an open-source software rapid development web framework, for use in building dynamic web sites with PHP. CodeIgniter is loosely based on the popular model-view-controller (MVC) development pattern. There are numerous leading companies that offer lots of job positions in CodeIgniter like PHP Developer with CodeIgniter Frame work, Senior PHP Developer, Backend Developer CodeIgniter etc.

Q1. Explain Codeigniter Architecture?

CodeIgniter is designed to deliver maximum performance in less time within a clean environment. To achieve this, each developing process is designed in a simplified way.

From technical point of view it is dynamically instantiation (libraries are loaded on request which makes it light-weighted), loose coupling. (components rely very less on each other) and component singularity (each class and its functions are narrowly focused only towards their purpose).

Q2. Explain MVC in CodeIgniter?

CodeIgniter framework is based on MVC pattern. MVC is a software that gives you a separate logical view from the presentation view. Due to this, a web page contains minimal scripting.

  • Model — The Controller manages models. It represents your data structure. Model classes contain functions through which you can insert, retrieve or update information in your database.
  • View — View is the information that is presented in front of users. It can be a web page or parts the page like header and footer.
  • Controllers — Controller is the intermediary between models and view to process HTTP request and generates a web page. All the requests received by the controller are passed on to models and view to process the information.

Q3. What is model and how you can load model in CodeIgniter?

The Controller manages models. It represents your data structure. Model classes contain functions through which you can insert, retrieve or update information in your database.

models are loaded as well as called inside your controller methods. For loading a model, you must use the below-given method:

$this->load->model('modelName');

Include the relative path from the directory of your model, if your model is placed inside a sub-directory. Consider an example, you have a model which is placed at application/models/author/AllAuthor.php you can load it by using: $this->load->model(‘author/AllAuthor’);

Q4. How can you connect models to a database manually?

Using following syntax you can load the database.

$this->load->database();

There is another method available which is automatice for that you have to add database library in autoload.php

Example

Path : application/config/autoload.php $autoload['libraries'] = array('database');

Q5. Explain view in CodeIgniter and how we can load the view?

View folder contains all the markup files like header, footer, sidebar, etc. They can be reused by embedding them anywhere in controller file. They can’t call directly, and they have to be loaded in the controller’s file.

You can create file in application/views folder. For example, we have created a file Welcome.php,

You can call this Welcome.php view file in controller using below code.

<?php defined('BASEPATH') or exit('No direct script access allowed'); class Index extends CI_Controller { public function __construct(){ parent::__construct(); } public function index(){ $this->load->view('welcome'); } }

Q6. How will you call a constructor in CodeIgniter?

We will call constructor in CodeIgniter using below method

Example

<?php defined('BASEPATH') or exit('No direct script access allowed'); class Index extends CI_Controller { public function __construct() { parent::__construct(); } }

Q7. Explain the basic Url Structure in Codeigniter?

The basic URL structure is developerdiary.in/class/function/ID.

In this class represents controller’s class that needs to be invoked.
 “ function” is name of method which is called.
“ ID: is an additional parameter that is passed to controllers.

Q8. What is the default method name in CodeIgniter?

By default controller call index method. If you want call another method then you shoud define this method in controller and call in the url

deveoperdiary.in/ControllerName/ YourCustomFunctionName

Q9. What is a helper in CodeIgniter?

Helpers are the group of functions that are used to assist the user to perform specific tasks.

  • URL Helpers: used to create the links.
  • Text Helpers: used for text formatting.
  • Cookies Helpers: used for reading and setting cookies.

Q10. How can you load multiple helper files?

Using following sample code we can load multiple helper.

$this->load->helper( array('helper1', 'helper2', 'helper3', 'helperxxxxx') );

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Originally published at https://www.developerdiary.in on July 13, 2022 here you will get more interview questions and answers. 🤟 🤘 🤙🙏🏼

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