Welcome to CodeIgniter4
Welcome to CodeIgniter4
Server Requirements
Credits
PSR Compliance
Installation
Composer Installation
Manual Installation
Running Your App
Upgrading From a Previous Version
Troubleshooting
CodeIgniter Repositories
Build Your First Application
Static pages
News section
Create news items
Conclusion
CodeIgniter4 Overview
Application Structure
Models, Views, and Controllers
Autoloading Files
Services
Factories
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
Cookies
CURLRequest Class
Email Class
Encryption Service
Working with Files
Honeypot Class
Image Manipulation Class
Pagination
Security
Session Library
Throttler
Times and Dates
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
Test Helper
Text Helper
URL Helper
XML Helper
Testing
Getting Started
Database
Generating Data
Controller Testing
HTTP Testing
Benchmarking
Debugging Your Application
Command Line Usage
Running via the Command Line
Custom CLI Commands
CLI Generators
CLI Library
CLIRequest Class
Extending CodeIgniter
Creating Core System Classes
Replacing Common Functions
Events
Extending the Controller
Authentication
Contributing to CodeIgniter
CodeIgniter
»
Installation
»
Upgrading From a Previous Version
Upgrading From a Previous Version
ΒΆ
Please read the upgrade notes corresponding to the version you are upgrading from.
Upgrading from 4.0.5 to 4.1.0 or 4.1.1
Upgrading from 4.0.4 to 4.0.5
Upgrading from 4.0.x to 4.0.4
Upgrading from 3.x to 4.x