CodeIgniter4 starter app

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CodeIgniter 4 Application Starter

What is CodeIgniter?

CodeIgniter is a PHP full-stack web framework that is light, fast, flexible and secure. More information can be found at the official site.

This repository holds a composer-installable app starter. It has been built from the development repository.

More information about the plans for version 4 can be found in CodeIgniter 4 on the forums.

You can read the user guide corresponding to the latest version of the framework.

Installation & updates

composer create-project codeigniter4/appstarter then composer update whenever there is a new release of the framework.

When updating, check the release notes to see if there are any changes you might need to apply to your app folder. The affected files can be copied or merged from vendor/codeigniter4/framework/app.


Copy env to .env and tailor for your app, specifically the baseURL and any database settings.

Important Change with index.php

index.php is no longer in the root of the project! It has been moved inside the public folder, for better security and separation of components.

This means that you should configure your web server to "point" to your project's public folder, and not to the project root. A better practice would be to configure a virtual host to point there. A poor practice would be to point your web server to the project root and expect to enter public/..., as the rest of your logic and the framework are exposed.

Please read the user guide for a better explanation of how CI4 works!

Repository Management

We use GitHub issues, in our main repository, to track BUGS and to track approved DEVELOPMENT work packages. We use our forum to provide SUPPORT and to discuss FEATURE REQUESTS.

This repository is a "distribution" one, built by our release preparation script. Problems with it can be raised on our forum, or as issues in the main repository.

Server Requirements

PHP version 8.1 or higher is required, with the following extensions installed:


  • The end of life date for PHP 7.4 was November 28, 2022.
  • The end of life date for PHP 8.0 was November 26, 2023.
  • If you are still using PHP 7.4 or 8.0, you should upgrade immediately.
  • The end of life date for PHP 8.1 will be December 31, 2025.

Additionally, make sure that the following extensions are enabled in your PHP:

  • json (enabled by default - don't turn it off)
  • mysqlnd if you plan to use MySQL
  • libcurl if you plan to use the HTTP\CURLRequest library