Course Content
Introduction to CodeIgniter
CodeIgniter is a powerful PHP framework built for developers who need a simple and elegant toolkit to create full-featured web applications.
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. The segments in a URI normally follow this pattern:
Forms and Input
Forms provide a way for users to interact with the application and submit data.
Composer is dependency manager in PHP. it allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
You can enable CSRF protection by modifying your application/config/config.php file
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.
DataTables is a table enhancing plug-in for the jQuery Javascript library that helps in adding sorting, paging, and filtering abilities to plain HTML tables with minimal effort. The main goal is to enhance the accessibility of data in normal HTML tables.
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.
Payment Gateway
Razorpay and PayTM Payment Gateway
WhatsApp Chatbot and Telegram Chatbot
CodeIgniter 3
About Lesson


CodeIgniter 3 is a popular PHP framework due to its simplicity, speed, and small footprint. Developers who need an elegant toolkit to create full-featured web applications will find CodeIgniter 3 incredibly useful. Both beginners and experienced developers can benefit from its comprehensive set of features.


Before you proceed you should have a basic understanding of the following:

  1. HTML
  2. PHP


EllisLab created CodeIgniter which is now a British Columbia Institute of Technology project.

The latest version of the CodeIgniter framework is 3.1.11.


The source code of CodeIgniter is hosted on GitHub and licensed under the terms of the MIT License.

As it is open-source software, you can copy, modify, and distribute it.

If you know PHP well, then CodeIgniter will make your task easier. It has a rich set of libraries and helpers. A website built in CodeIgniter is secure, as it can prevent various attacks that take place through websites. Using CodeIgniter will save you much time if you develop a website from scratch.

Why Choose CodeIgniter 3?

  1. Lightweight and Fast: CodeIgniter 3 performs exceptionally well because of its small footprint. It runs faster and uses fewer resources compared to other frameworks.
  2. Easy to Learn: The framework offers a user-friendly and straightforward design. Beginners can quickly grasp its concepts, while advanced developers can leverage its powerful features.
  3. Extensive Documentation: CodeIgniter 3 provides thorough and clear documentation, making it easy to understand and implement its features.
  4. MVC Architecture: The framework follows the Model-View-Controller (MVC) architecture, promoting a structured and maintainable codebase.
  5. Security: Built-in security features help protect web applications from threats like SQL injection, XSS attacks, and CSRF.


Features of CodeIgniter are listed below:

  • Model-View-Controller based framework
  • Extremely Light Weight
  • Query Builder Database Support
  • Security and XSS Filtering
  • Form and Data Validation
  • Session Management
  • Search-engine Friendly URLs
  • Localization
  • Pagination
  • Data Encryption