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  • Welcome to CodeIgniter4
    • Welcome to CodeIgniter4
    • Server Requirements
    • Credits
    • PSR Compliance
    • License Agreement
  • Installation
    • Composer Installation
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    • Running Your App
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    • Getting Started with REST APIs
  • CodeIgniter4 Overview
    • Application Structure
    • Models, Views, and Controllers
    • Autoloading Files
    • Services
    • Factories
    • Working with HTTP Requests
    • Security Guidelines
    • Design and Architectural Goals
  • 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
    • URI Routing
    • Controllers
    • Controller Filters
    • Controller Attributes
    • Auto Routing (Improved)
    • HTTP Messages
    • Request Class
    • IncomingRequest Class
    • Content Negotiation
    • HTTP Method Spoofing
    • RESTful Resource Handling
  • Building Responses
    • Views
    • View Renderer
    • View Layouts
    • View Cells
    • View Parser
    • View Decorators
    • HTML Table Class
    • HTTP Responses
    • API Responses
    • API Resources
    • Content Security Policy
    • 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 Methods
    • 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 Forge
    • Database Migrations
    • Database Seeding
    • Database Commands
  • Library Reference
    • Caching Driver
    • Cookies
    • Cross-Origin Resource Sharing (CORS)
    • CURLRequest Class
    • Email Class
    • Encryption Service
    • Working with Files
    • File Collections
    • Honeypot Class
    • Image Manipulation Class
    • Pagination
    • Publisher
    • 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
    • Testing Responses
    • Testing CLI Commands
    • Mocking
    • Benchmarking
    • Debugging Your Application
    • Session Testing
  • Command Line Usage
    • CLI Overview
    • Running Controllers via CLI
    • Spark Commands
    • Creating Spark Commands
    • CLI Generators
    • CLI Library
    • CLI Signals
    • CLIRequest Class
  • Extending CodeIgniter
    • Creating Core System Classes
    • Replacing Common Functions
    • Events
    • Extending the Controller
    • Authentication
    • Creating Composer Packages
    • Contributing to CodeIgniter
  • Official Packages
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  • CodeIgniter4 Overview

CodeIgniter4 Overview

The following pages describe the architectural concepts behind CodeIgniter4:

  • Application Structure
  • Models, Views, and Controllers
  • Autoloading Files
  • Services
  • Factories
  • Working with HTTP Requests
  • Security Guidelines
  • Design and Architectural Goals
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