Codeigniter 4 Documentation

CodeIgniter is an Application Development Framework - a toolkit - for people who build web sites using PHP. Its goal is to enable you to develop projects much faster than you could if you were writing code from scratch, by providing a rich set of libraries for commonly needed tasks, as well as a simple interface and logical structure to access these libraries. CodeIgniter lets you creatively focus on your project by minimizing the amount of code needed for a given task.

Where possible, CodeIgniter has been kept as flexible as possible, allowing you to work in the way you want, not being forced into working any certain way. The framework can have core parts easily extended or completely replaced to make the system work the way you need it to. In short, CodeIgniter is the malleable framework that tries to provide the tools you need while staying out of the way.

Topics Included in this App :

CodeIgniter4 User Guide

Welcome to CodeIgniter4

Server Requirements

Credits

PSR Compliance

Getting Started

Installation

Manual Installation

Composer Installation

Running Your App

Upgrading From a Previous Version

Troubleshooting

CodeIgniter Repositories

Build Your First Application

Static pages

News section

Create news items

Conclusion

Overview & General Topics

CodeIgniter4 Overview

Application Structure

Models, Views, and Controllers

Autoloading Files

Services

Working With HTTP Requests

Security Guidelines

General Topics

Configuration

CodeIgniter URLs

Helper Functions

Global Functions and Constants

Logging Information

Error Handling

Web Page Caching

AJAX Requests

Code Modules

Managing your Applications

Handling Multiple Environments

Controllers and Routing

Controllers

URI Routing

Controller Filters

HTTP Messages

Request Class

IncomingRequest Class

Content Negotiation

HTTP Method Spoofing

RESTful Resource Handling

Building Responses

Views

View Cells

View Renderer

View Layouts

View Parser

HTML Table Class

HTTP Responses

API Response Trait

Localization

Alternate PHP Syntax for View Files

Working With Databases

Quick Start: Usage Examples

Database Configuration

Connecting to a Database

Running Queries

Generating Query Results

Query Helper Functions

Query Builder Class

Transactions

Getting MetaData

Custom Function Calls

Database Events

Database Utilities

Modeling Data

Using CodeIgniter's Model

Using Entity Classes

Managing Databases

Database Manipulation with Database Forge

Database Migrations

Database Seeding

Library Reference

Caching Driver

CURLRequest Class

Email Class

Encryption Service

Working with Files

Honeypot Class

Image Manipulation Class

Pagination

Security Class

Session Library

Throttler

Dates and Times

Typography

Working with Uploaded Files

Working with URIs

User Agent Class

Validation

Helpers

Array Helper

Cookie Helper

Date Helper

Filesystem Helper

Form Helper

HTML Helper

Inflector Helper

Number Helper

Security Helper

Text Helper

URL Helper

XML Helper

Testing

Getting Started

Database

Controller Testing

HTTP Testing

Benchmarking

Debugging Your Application

Command Line Usage

Running via the Command Line

Custom CLI Commands

CLI Library

CLIRequest Class

Extending CodeIgniter

Creating Core System Classes

Replacing Common Functions

Events

Extending the Controller

Authentication

Contributing to CodeIgniter