FA-0722Software Development

CodeIgniter 4 Web Application Foundations

MVC, data, sessions and a small application project

Introduction

Why this course

Build a small web application with CodeIgniter 4, combining MVC concepts with database operations, sessions, files and error handling. The course balances explanations with a guided project and review.

The source mixes older terminology and omits a Day3 heading. This course makes the current framework version explicit and reorganises the four days without implying CodeIgniter3 applications are directly compatible with version4.

Learning outcomes

Explain dynamic web requests and the roles of models, views and controllers.
Install and configure a compatible CodeIgniter 4 project and define routes.
Implement and validate a small CRUD workflow using a database and model.
Use sessions, cookies, helpers, libraries and appropriate error handling.
Handle a selected file-upload and email/localisation example.
Build and review a modest login/dashboard project with basic security controls.

Prerequisites

Basic PHP programming, HTML and relational SQL; familiarity with functions and classes.
A compatible PHP runtime and required extensions, Composer or the supported manual installation package, an editor and supplied database.
Approved local development environment and sample data; real mail delivery or live deployment is not required.

Training outline

4 modules

01Day 1 — Framework, MVC and CRUD4 topics

Install CodeIgniter 4, inspect its namespaced application structure, configuration and public document root.
Models, controllers, views and explicitly defined routes; distinguish framework4 from older CodeIgniter3 examples.
Create a sample database/model and implement create, read, update and delete operations.
Validate input, inspect output and trace request routing.

02Day 2 — Sessions, libraries and security5 topics

Cookies and sessions: lifecycle, storage and appropriate configuration.
Use selected framework libraries and helpers; review redirects and error handling.
Introduce authentication versus authorisation, password handling, CSRF protection and output escaping.
Use current events or filters for relevant extension points; older hooks are historical framework3 terminology, not a direct copy-and-paste migration.
Assess the small CRUD example and introduce caching with appropriate privacy/invalidation considerations.

03Day 3 — Files, email and localisation5 topics

Validate a sample file upload, restrict accepted inputs and store files appropriately.
Inspect application errors and logs without exposing sensitive details to end users.
Configure a supplied email example with local capture or approved test delivery.
Introduce internationalisation/localisation and selected language output.
Review database structure and scope the final project.

04Day 4 — Small application project and review4 topics

Implement a modest login flow using a suitable maintained authentication approach.
Build a dashboard with shared header/footer views, a sample user listing and logout.
Apply permissions to protected routes and review session, validation and error behaviour.
Test selected success and failure paths, document unresolved issues and identify next steps; the exercise is not a production security certification.

A programme built around your team.

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