Course Content
Introduction to CodeIgniter 4
CodeIgniter is an Application Development Framework. CodeIgniter is a popular and powerful MVC (Model-View-Controller) framework that is used to develop web applications. It is a free and Open-source PHP framework.
MVC (Model-View-Controller)
MVC stands for Model-View-Controller. MVC is an application design model consisting of three interconnected parts. They include the model (data), the view (user interface), and the controller (processes that handle input).
The Session class allows you to maintain a user’s "state" and track their activity while they browse your site.
URI Routing
There is a one-to-one relationship between a URL string and its corresponding controller class/method.
Working with Database
Like any other framework, we need to interact with the database very often and CodeIgniter makes this job easy for us. It provides a rich set of functionalities to interact with the database.
PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. Importing Excel and CSV into MySQL help to save the user time and avoid repetitive work.
CodeIgniter 4
About Lesson


CodeIgniter4 can be installed in several different ways: manually, using Composer, or using Git.

  • Manual Installation:
    Download the latest version, and extract it to become your project root.
  • Composer Installation:
    Composer can be used in several ways to install CodeIgniter4 on your system

Running Your App

Type the following on the command line from the root of your project:

php spark serve

The Welcome Page

Run the following URL in your browser:



Before using CodeIgniter 4, make sure that your server meets the requirements.