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 ComplianceGetting Started Installation Manual Installation Composer Installation Running Your App Upgrading From a Previous Version Troubleshooting CodeIgniter RepositoriesBuild Your First Application Static pages News section Create news items ConclusionOverview & General Topics CodeIgniter4 Overview Application Structure Models, Views, and Controllers Autoloading Files Services Working With HTTP Requests Security GuidelinesGeneral 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 EnvironmentsControllers and Routing Controllers URI Routing Controller Filters HTTP Messages Request Class IncomingRequest Class Content Negotiation HTTP Method Spoofing RESTful Resource HandlingBuilding Responses Views View Cells View Renderer View Layouts View Parser HTML Table Class HTTP Responses API Response Trait Localization Alternate PHP Syntax for View FilesWorking 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 UtilitiesModeling Data Using CodeIgniters Model Using Entity ClassesManaging Databases Database Manipulation with Database Forge Database Migrations Database SeedingLibrary 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 ValidationHelpers Array Helper Cookie Helper Date Helper Filesystem Helper Form Helper HTML Helper Inflector Helper Number Helper Security Helper Text Helper URL Helper XML HelperTesting Getting Started Database Controller Testing HTTP Testing Benchmarking Debugging Your ApplicationCommand Line Usage Running via the Command Line Custom CLI Commands CLI Library CLIRequest ClassExtending CodeIgniter Creating Core System Classes Replacing Common Functions Events Extending the Controller Authentication Contributing to CodeIgniter