Codeigniter Tutorials, Examples & Guides

CODEIGNITER SHIELD

AUTHENTICATION

LOGIN SYSTEM

CodeIgniter 4 Authentication Tutorial: Build Login & Registration System from Scratch

Authentication is one of the most essential features of any modern web application. While older tutorials relied on custom implementations or the now-deprecated Myth/Auth library, the official and recommended approach in 2026 is CodeIgniter Shield — a powerful, secure, and flexible authentication & authorization library built specifically for CodeIgniter 4.

In this comprehensive, step-by-step guide, you will learn how to build a complete login and registration system from scratch using Shield. We cover everything from installation and configuration to creating controllers, views, routes, and testing — with full source code included.

This tutorial is perfect for beginners and intermediate PHP developers who want a secure, scalable, and clean authentication system following CodeIgniter 4 best practices.

CODEIGNITER

4 CRUD

MYSQL BLOG

BOOTSTRAP TUTORIAL

CI4 BLOG

PHP MVC TUTORIAL

CODEIGNITER BEGINNER

How to Build a Simple Blog in CodeIgniter 4 with MySQL and Bootstrap Tutorial

Learn how to build a fully functional blog application using CodeIgniter 4, MySQL, and Bootstrap 5 in this beginner-friendly tutorial. We walk through the complete process — from project installation and database migration to creating models, controllers, views, and routes. By the end, you will have a working blog with Create and Read functionality styled with Bootstrap, which you can extend with Update, Delete, authentication, and pagination for production use.

Role-Based Login System in CodeIgniter 4: Admin & User Roles – Best for Small Projects?

CODEIGNITER 4 LOGIN SYSTEM

ROLE BASED ACCESS CONTROL CODEIGNITER 4

CI4 ADMIN USER AUTHENTICATION

CODEIGNITER 4 RBAC TUTORIAL

BEST AUTH FOR SMALL PHP PROJECTS

CODEIGNITER SHIELD VS CUSTOM LOGIN

PHP FRAMEWORK AUTHENTICATION SMALL SCALE

CODEIGNITER 4 ROLE FILTER MIDDLEWARE

Role-Based Login System in CodeIgniter 4: Admin & User Roles – Best for Small Projects?

Securing user access is a critical step in any web application, especially when different users need different levels of control. CodeIgniter 4 (CI4), known for its lightweight footprint and speed, is an excellent choice for implementing role-based access control (RBAC) in small to mid-size projects. In this hands-on tutorial, we will build a complete role-based login system from scratch in CodeIgniter 4 — covering database setup with migrations, user authentication with hashed passwords, session-based role management, route-level middleware filters, and separate admin and user dashboards. Whether you are building a blog, internal tool, or small e-commerce app, this guide gives you full control over authentication without the overhead of third-party libraries.

CodeIgniter 4 vs Laravel 12: Which PHP Framework is Better for Small Projects?

CODEIGNITER 4,LARAVEL 12,PHP FRAMEWORK COMPARISON,BEST PHP FRAMEWORK SMALL PROJECTS,CODEIGNITER VS LARAVEL,LIGHTWEIGHT PHP FRAMEWORK,FEATURE

RICH PHP FRAMEWORK,PHP PERFORMANCE SMALL APPS,PHP LEARNING CURVE,PHP SECURITY FRAMEWORKS

CodeIgniter 4 vs Laravel 12: Which PHP Framework is Better for Small Projects?

Choosing the right PHP framework can make or break a small project's success. CodeIgniter 4 and Laravel 12 are two of the most popular options in 2026, each with distinct strengths. CodeIgniter 4 is known for its lightweight speed and simplicity, while Laravel 12 offers a feature-rich ecosystem for scalable applications. This in-depth comparison covers performance, ease of use, security, scalability, and real-world use cases to help you decide which framework best fits your next small project.

How to Secure Your CodeIgniter 4 Application from SQL Injection

SECURE CODEIGNITER 4 FROM SQL INJECTION

CODEIGNITER 4 QUERY BINDINGS

CODEIGNITER 4 QUERY BUILDER SECURITY

PREVENT SQL INJECTION IN PHP

CODEIGNITER 4 PREPARED STATEMENTS

ESCAPELIKESTRING CODEIGNITER 4

VALIDATE INPUT CODEIGNITER 4

SECURE ORDERBY CODEIGNITER 4

CI4 SECURITY BEST PRACTICES

PHP SQL INJECTION PREVENTION

How to Secure Your CodeIgniter 4 Application from SQL Injection

SQL injection remains one of the most dangerous web application vulnerabilities in 2026. In this hands-on guide, you will learn how to secure your CodeIgniter 4 application against SQL injection attacks using the framework's built-in Query Builder, prepared statements with query bindings, server-side input validation, CSRF protection, and secure password hashing. We walk through a complete user management system — registration, login, search, and profile — with full working code and detailed explanations of every security measure applied.

CODEIGNITER 4 REST API

CRUD OPERATIONS CODEIGNITER

REST API POSTMAN TESTING

CODEIGNITER API TUTORIAL

PHP REST API EXAMPLE

CODEIGNITER 4 CRUD

RESTFUL API PHP

API DEVELOPMENT CODEIGNITER

CodeIgniter 4 REST API CRUD Example with Postman: Complete Tutorial

In modern web development, RESTful APIs serve as the backbone of scalable applications, enabling seamless communication between servers and diverse clients such as mobile apps, single-page applications (SPAs), and third-party services. CodeIgniter 4, a lightweight yet powerful PHP framework, offers built-in tools like ResourceController and the ResponseTrait to create clean, efficient REST APIs with minimal boilerplate code. In this comprehensive, step-by-step tutorial, you will build a fully functional CRUD (Create, Read, Update, Delete) REST API from scratch using CodeIgniter 4. We will cover project installation, MySQL database setup, model creation with validation rules, building a RESTful controller with proper error handling, route configuration, and thorough testing of every endpoint using Postman.

Complete Guide to Building a Multi-Language Website in CodeIgniter 4 with i18n Support

CODEIGNITER 4 MULTI LANGUAGE

I18N CODEIGNITER 4

CODEIGNITER INTERNATIONALIZATION

CI4 LOCALIZATION, MULTI LANGUAGE WEBSITE PHP

CODEIGNITER LANGUAGE SWITCH

CI4 LANGUAGE FILES

INTERNATIONALIZATION PHP FRAMEWORK

CODEIGNITER 4 LOCALE DETECTION

CI4 SUPPORTED LOCALES

Complete Guide to Building a Multi-Language Website in CodeIgniter 4 with i18n Support

In today's globalized digital landscape, creating a multi-language website is essential for reaching diverse audiences. Whether you're building an e-commerce platform, a blog, or a corporate site, supporting multiple languages can significantly boost user engagement and SEO performance. CodeIgniter 4 (CI4), a lightweight and powerful PHP framework, offers robust built-in tools for internationalization (i18n) through its Localization library. This guide will walk you through the process of implementing i18n in CI4, from basic setup to advanced features like language switching and dynamic content translation. By the end, you'll have a fully functional multi-language website example, complete with code snippets and explanations.

How to Run CodeIgniter 4 with Docker and Docker Compose: Complete Tutorial with Code

CODEIGNITER 4 DOCKER

RUN CODEIGNITER DOCKER COMPOSE

CONTAINERIZE CODEIGNITER 4

CODEIGNITER PHP DOCKER TUTORIAL

DOCKER COMPOSE PHP MYSQL

CODEIGNITER APACHE DOCKER SETUP

CI4 CONTAINERIZATION GUIDE

PHP DOCKER APACHE TUTORIAL

How to Run CodeIgniter 4 with Docker and Docker Compose: Complete Tutorial with Code

In today's development landscape, containerization has become essential for building scalable and portable applications. CodeIgniter 4, a lightweight yet powerful PHP framework, pairs exceptionally well with Docker to create isolated, reproducible environments. This comprehensive guide walks you through setting up CodeIgniter 4 using Docker and Docker Compose — covering PHP 8.1, Apache, MySQL 8.0, environment variables, volumes, and networking. Whether you are deploying your first CI4 project or standardizing your team's workflow, this tutorial gives you a production-ready Docker setup with complete code examples and detailed explanations for every step.

How to Use Redis Cache in CodeIgniter 4: A Complete Guide with Code Examples

REDIS CACHE CODEIGNITER 4

CODEIGNITER 4 REDIS TUTORIAL

IMPLEMENT REDIS IN CI4

CODEIGNITER CACHING GUIDE

REDIS PHP EXTENSION CODEIGNITER

PREDIS CODEIGNITER 4

CI4 CACHE CONFIGURATION

REDIS PERFORMANCE OPTIMIZATION CI4

CODEIGNITER 4 CACHE DRIVER

CI4 PERFORMANCE TUNING

How to Use Redis Cache in CodeIgniter 4: A Complete Guide with Code Examples

Caching is a crucial technique for improving the performance of web applications by storing frequently accessed data in a fast-access storage layer. In CodeIgniter 4, the framework provides built-in support for multiple caching drivers, including Redis — an in-memory data structure store known for its speed and versatility. Redis can act as a cache, database, or message broker, making it ideal for high-traffic applications. This step-by-step tutorial covers Redis installation, CI4 configuration with both phpredis and Predis, practical controller examples, cache invalidation strategies, and performance best practices.

How to Implement MFA/2FA in CodeIgniter 4 with Google Authenticator

CODEIGNITER 4 MFA

CODEIGNITER 4 2FA

GOOGLE AUTHENTICATOR CODEIGNITER

MFA SETUP CODEIGNITER 4

TWO FACTOR AUTHENTICATION CI4

CODEIGNITER SECURITY AUTHENTICATION

TOTP CODEIGNITER 4

CODEIGNITER 4 SECURITY TUTORIAL

How to Implement MFA/2FA in CodeIgniter 4 with Google Authenticator

Security is no longer optional for modern web applications. Password-only authentication is vulnerable to phishing, credential stuffing, and brute-force attacks. This is why Multi-Factor Authentication (MFA)—also known as Two-Factor Authentication (2FA)—has become a standard security requirement. In this step-by-step tutorial, you will learn how to implement MFA/2FA in CodeIgniter 4 using Google Authenticator with complete working code examples.

CODEIGNITER 4 FILTERS

CI4 FILTERS, CODEIGNITER 4 AUTHENTICATION FILTER

CODEIGNITER 4 CUSTOM FILTER

CODEIGNITER 4 MIDDLEWARE

CODEIGNITER 4 FILTER EXAMPLE

CODEIGNITER 4 AUTH FILTER

CODEIGNITER 4 ROUTE FILTERS

CodeIgniter 4 Filters: A Complete Guide with Examples

Learn how to use filters in CodeIgniter 4 with this step-by-step guide. This tutorial covers before and after filters, authentication filter example, route-specific configuration, role-based access control, and best practices for building secure PHP applications using CI4 filters.

CODEIGNITER4

PDF

DOMPDF

Generate PDF from HTML in CodeIgniter 4 Using Dompdf

In modern web applications built with CodeIgniter 4, generating PDFs for invoices, receipts, reports, or contracts is a common requirement. Dompdf is a popular, lightweight PHP library that converts HTML + CSS directly into PDF documents — no external dependencies needed beyond Composer.
This step-by-step guide shows you how to integrate Dompdf in CodeIgniter 4 to create dynamic PDFs (using a real-world invoice example with order data from MySQL). By the end, you'll have a working PDF generator.

CODEIGNITER4

VCARD

AJAX

HOW TO CREATE VCARD IN CODEIGNITER

GENERATE VCARD CODEIGNITER

DOWNLOAD VCARD CODEIGNITER

CREATE VCARD FILE IN CODEIGNITER

CODEIGNITER VCARD

CODEIGNITER VCARD LIBRARY

How to Dynamically Generate and Download vCard Files in CodeIgniter 4

In this tutorial, you'll learn how to dynamically generate vCard (.vcf) files in CodeIgniter 4 and allow users to download contact information directly from your database. This is useful for contact management apps, directories, or CRM-like systems.
We'll build a simple contact list with DataTables, add new contacts via popup, and provide a "Download vCard" button per record.

CODEIGNITER4

CHARTS

APEXCHARTS

DYNAMIC BAR CHART IN CODEIGNITER

CHART IN CODEIGNITER

CHARTS WITH CODEIGNITER

BAR CHART IN CODEIGNITER

Create Dynamic Charts with Filter Options in ApexCharts using CodeIgniter 4

ApexCharts is a powerful, open-source JavaScript library for creating responsive, interactive charts (bar, line, area, pie, and more). In this CodeIgniter 4 tutorial, you'll learn how to build a dynamic bar chart that displays monthly user registrations — with real-time filtering by year using AJAX. No page reloads needed. This guide covers project setup, database seeding, backend data processing, and frontend chart rendering/updates. Ideal for admin dashboards or analytics pages.

CODEIGNITER4

EVENTS

FULLCALENDAR

AJAX

Integrate FullCalendar in CodeIgniter 4: Build an Events Calendar with CRUD, AJAX & MySQL

FullCalendar is a powerful JavaScript calendar library for displaying and managing events. In this CodeIgniter 4 FullCalendar tutorial, you'll learn to build a complete events calendar with CRUD operations using AJAX, drag-and-drop, date selection, and MySQL storage. This is ideal for appointment booking, task scheduling, or event management systems.

CODEIGNITER4

PDF

TCPDF

Generate PDF in CodeIgniter 4 Using TCPDF – Complete Tutorial

PDF generation is essential for invoices, receipts, reports, and printable documents in web apps. CodeIgniter 4 doesn't include a native PDF library, so TCPDF (a robust, open-source PHP class) is a popular choice. This tutorial shows you how to integrate TCPDF in CodeIgniter 4 to generate dynamic PDFs from database data. We'll build a simple invoice system.

CODEIGNITER4

STRIPE

PAYMENTGATEWAY

Laravel 11 Stripe Payment Gateway Integration: Step-by-Step Tutorial

Stripe remains one of the most popular payment gateways for Laravel applications thanks to its robust API, strong security (PCI compliance), and support for global payments. In this updated Laravel 11 Stripe integration tutorial (compatible with 2026 best practices), we'll implement a secure one-time payment system using Stripe.js for client-side tokenization and the Stripe PHP library for server-side processing.

CODEIGNITER4

STRIPE

PAYMENTGATEWAY

CodeIgniter 4 Stripe Payment Gateway Integration – Payment Intents

Integrating a reliable and secure payment gateway is essential for any modern e-commerce application, membership site, or online service. In 2026, Stripe remains the #1 choice for developers worldwide due to its excellent documentation, global payment support, built-in fraud protection, and seamless compliance with PSD2, SCA, and 3D Secure standards.

CODEIGNITER 4

XML

SITEMAP

Create a Dynamic XML Sitemap in CodeIgniter 4 – Complete Tutorial

A dynamic XML sitemap in CodeIgniter 4 automatically lists your website's URLs (including posts, pages, or products) and helps search engines like Google discover and index content faster. This improves SEO, crawl efficiency, and visibility — especially for sites with frequently updated or database-driven content.

In this guide, you'll build a fully dynamic sitemap that pulls URLs from a database, includes metadata like lastmod, changefreq, and priority, and serves it at /sitemap.xml.

CodeIgniter 4 JWT Authentication: Complete Tutorial for Secure API Login & Register

CODEIGNITER 4 JWT API AUTHENTICATION

CODEIGNITER 4 LOGIN AND REGISTER WITH JWT

JWT

API

AUTHENTICATION

CodeIgniter 4 JWT Authentication: Complete Tutorial for Secure API Login & Register

Build a secure, token-based authentication system for your CodeIgniter 4 REST API using JWT (JSON Web Tokens). This stateless approach is ideal for mobile apps, SPAs, and microservices. We'll cover setup, user registration/login, token generation/validation, protected routes, and best practices.

CODEIGNITER4

AJAX

LOADMOREDATA

JQUERY

CodeIgniter 4: Load More Data on Page Scroll with AJAX and jQuery (Infinite Scroll)

Infinite scrolling (also called endless scroll or lazy pagination) improves user experience by automatically loading more records as the user scrolls down — no "Next" buttons needed. In this tutorial, we'll build it in CodeIgniter 4 using jQuery AJAX to fetch paginated data from MySQL without page reloads.

CODEIGNITER 4

DATATABLES

CODEIGNITER 4 DATATABLES

AJAX DATATABLES

DATATABLE SERVER SIDE PROCESSING

Server-Side DataTables in CodeIgniter 4: Complete AJAX Tutorial

Server-side processing with DataTables is essential when dealing with large datasets in web applications. Instead of loading thousands of rows at once (client-side), DataTables sends AJAX requests to the server for each page, search, or sort — dramatically improving performance.

CODEIGNITER4

FACEBOOKACCOUNT

GETSAMPLECODE

HOWTOUSECODEIGNITER4FACEBOOKLOGIN

IMPLEMENTFACEBOOKACCOUNTLOGININCODEIGNITER4APP

Facebook Login in CodeIgniter 4: Complete Step-by-Step Tutorial (Using Graph SDK & OAuth 2.0)

In today's web applications, social login options like Facebook login improve user experience by eliminating the need for separate registrations. This CodeIgniter 4 Facebook login tutorial shows you how to integrate Facebook OAuth 2.0 authentication using the official Facebook Graph SDK via Composer. Users can log in securely, and you'll retrieve basic profile data (ID, name, email) to store in session or database.

CODEIGNITER4

GOOGLEACCOUNT

GETSAMPLECODE

HOWTOUSECODEIGNITER4GOOGLELOGIN

IMPLEMENTGOOGLEACCOUNTLOGININCODEIGNITER4APP

Implement Google Login (OAuth 2.0) in CodeIgniter 4 – Complete Tutorial with Example Code

Adding Google Sign-In to your CodeIgniter 4 application improves user experience, boosts conversion rates, and enhances security by leveraging Google's authentication. This step-by-step guide shows you how to integrate Google OAuth login using the official Google API Client library — no third-party packages needed beyond Composer.

CODEIGNITER4

SHIELD

GETSAMPLECODE

HOWTOUSECODEIGNITER4SHIELD

INSTALLANDCONFIGURECODEIGNITER4SHIELD

How to Install and Configure CodeIgniter 4 Shield – Complete Tutorial

CodeIgniter 4 Shield is the official, powerful authentication and authorization library for CodeIgniter 4. It handles login, registration, password reset, email activation, roles/permissions, and more—securely and with minimal setup.

CODEIGNITER4

AWS

S3

HOWTOUSEAWSS3BUCKETINCODEIGNITER4

HOWTOSTOREANDMANAGEFILESCODEIGNITER4

GETSAMPLECODE

How to Upload Files to AWS S3 Bucket in CodeIgniter 4 – Complete Tutorial

In modern web apps, storing user-uploaded files locally limits scalability and security. CodeIgniter 4 AWS S3 integration solves this by using Amazon's reliable cloud storage. This step-by-step tutorial shows how to upload, list, download, and delete files from an S3 bucket using the official AWS SDK for PHP.

CODEIGNITER4

QRCODE

PHPLIBRARY

GENERATEQRCODEINCODEIGNITER4APP

GETCODEIGNITERSAMPLECODE

Generate QR Codes in CodeIgniter 4: Complete Tutorial with Server Storage

QR codes remain essential in 2026 for contactless menus, event tickets, payments, vCards, and marketing. In this guide, you'll learn how to generate QR codes in CodeIgniter 4 dynamically, support multiple formats (URL, text, phone, SMS, email, Skype, vCard), store them as PNG images on your server, and display them instantly. We use the reliable PHP QR Code library with a custom wrapper for easy integration.
Why this approach? It's lightweight, requires no external API, gives full control over styling/storage, and works offline.

How to Create a Custom Library in CodeIgniter 4 – complete Step-by-Step Guide

CUSTOMLIBRARYINCODEIGNITER4APP

GETCODEIGNITERSAMPLECODE

CODEIGNITERDEMOVIDEOS

HOWTOCREATECUSTOMLIBRARY

How to Create a Custom Library in CodeIgniter 4 – complete Step-by-Step Guide

Creating a custom library in CodeIgniter 4 is a powerful way to extend the framework’s functionality to suit your application's specific needs. Here’s a step-by-step guide on how to create a custom library in CodeIgniter 4.

CODEIGNITER4

HMVC

CODEIGNITER4HMVCAPPLICATION

GETCODEIGNITER4SAMPLECODE

HOWTOGETCODEIGNITER4SAMPLECODE

SAMPLECODEDEMOVIDEOONLINE

CodeIgniter 4 HMVC: How to Build Modular Applications (Step-by-Step Guide)

In this article, we explore the CodeIgniter 4 HMVC application in detail. We’ll walk through how to set up HMVC integration in CodeIgniter 4, and look at examples of applications built using the CodeIgniter 4 HMVC Architecture Pattern.

CODEIGNITER4

CKEDITOR5

CKFINDER

CODEIGNITER4CKEDITOR5

IMPLEMENTINGCKEDITOR

CKFINDERFORIMAGEUPLOADTOTHESERVER

GETCODEIGNITER4CKEDITOR5SAMPLECODE

HOWTOGETCODEIGNITER4CKEDITORSAMPLECODE

SAMPLECODEDEMOVIDEOONLINE

How to Integrate CKEditor 5 with Image Upload in CodeIgniter 4

While developing applications on the CodeIgniter 4 framework, you may require rich text area fields. In such cases, CKEditor 5 is a great option. This tutorial guides you through how to integrate CKEditor 5 in Codeigniter 4, including CKFinder for image upload to the server.

CODEIGNITER4

PAYMENTGATEWAY

MONERIS

CODEIGNITER4PAYMENTGATEWAY

INTEGRATEMONERISPAYMENTGATEWAY

GETCODEIGNITER4SAMPLECODE

HOWTOGETCODEIGNITER4PAYMENTGATEWAYSAMPLECODE

SAMPLECODEDEMOVIDEOONLINE

Moneris Payment Gateway Integration in CodeIgniter 4: Complete Step-by-Step Guide

Integrating Moneris allows your CodeIgniter 4 e-commerce site to accept credit card payments securely. This guide uses the Moneris Gateway API (direct method). For a hosted solution, explore Moneris Checkout.

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