PHP 8.1 or newer (including support for PHP 8.4).
You must enable intl , mbstring , json , and xml in your php.ini file. codeigniter 4 download
Supports MySQL (5.1+), PostgreSQL (7.4+), SQLite3, and MS SQL Server (2012+). Option 1: Recommended Composer Installation codeigniter 4 download
The official CodeIgniter User Guide recommends using because it simplifies future updates. Server Requirements — CodeIgniter 4.7.2 documentation codeigniter 4 download
Before downloading, ensure your server environment is ready. As of early 2026, CI4 is designed for modern PHP environments: