Building Web Applications With CodeIgniter MVC Architecture

Posted By : Sunil Vishwakarma | 28-Jul-2023

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Today, we'll look at how to use the robust Model-View-Controller (MVC) architecture of CodeIgniter to build feature-rich online apps. Popular PHP framework CodeIgniter is well-known for being quick, simple, and easy to use, making it a great option for creating online applications of all sizes.

Understanding the MVC Architecture of CodeIgniter

The Model-View-Controller (MVC) architectural design is used by CodeIgniter. The application is structured according to this design into three key parts:

1. Model: represents the application's business logic and data. It engages with the database and carries out actions such as data processing and validation.

2. View: manages the user interface and provides data in a readable way to the user. The HTML, CSS, and JavaScript components are shown via the View files.

3. Controller: serves as a go-between for the Model and the View. It analyses input from the user, communicates with the model to retrieve or modify data, and chooses which view to load.

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Putting CodeIgniter in MVC Mode

1. Download and Install CodeIgniter: Start by downloading CodeIgniter's most recent version from the program's official website ( Place the files on your server after extraction.

2. Application Structure: The application architecture of CodeIgniter already follows the MVC pattern.


  • controllers/: Place your Controller classes here
  • models/: Store your Model classes in this directory
  • views/: Create View files in this folder

Implementing the Model

Make PHP files for the Model classes in your application and place them in the model's directory. These classes ought to extend the CI_Model class from CodeIgniter. Create functions for these classes that deal with data activities like updating records or retrieving data from a database.

Implementing the View

Make PHP files that represent the View for each associated Controller function and place them in the views directory. The presentation logic and HTML code required to display the data passed from the Controller should be contained in the view files.

Implementing the Controller

Make PHP files to specify your controllers and place them in the controller's directory. These classes ought to extend the CI_Controller class from CodeIgniter. Each Controller function represents a particular action that the user can carry out. You can interact with Models within these functions to retrieve data and load the proper View to present the data.

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Routing Requests

Routing is automatically handled by CodeIgniter, which associates URLs with particular Controllers and operations. If necessary, you can configure special routes in the routes.php file found in the application/config directory.

Database Interactions

To simplify database interactions, CodeIgniter offers a built-in Database Class. Within the application/config directory, in the database.php file, you can set your database options. To carry out CRUD activities securely, use Query Builder or CodeIgniter's active record methods.


You may create dependable, maintainable, and scalable online apps by adhering to CodeIgniter's MVC architectural pattern. Working effectively in a team and ensuring that your code is well-organized and simple to maintain are both made possible by the separation of concerns.

Explore CodeIgniter's documentation to learn about all of its features, libraries, and helpers so you can use them to quickly and easily create robust online apps.