Installation

############ Installation ############

CodeIgniter has two supported installation methods: manual download, or using Composer <https://getcomposer.org>_. Which is right for you?

• We recommend the Composer installation because it keeps CodeIgniter up to date easily.
• If you would like the simple "download & go" install that CodeIgniter 3 is known for, choose the manual installation.

However you choose to install and run CodeIgniter4, the latest user guide <https://codeigniter.com/user_guide/>_ is accessible online. If you want to see previous versions, you can download from the codeigniter4/userguide <https://github.com/codeigniter4/userguide/releases>_ repository.

.. note:: Before using CodeIgniter 4, make sure that your server meets the :doc:requirements </intro/requirements>, in particular the PHP version and the PHP extensions that are needed. You may find that you have to uncomment the php.ini "extension" lines to enable "curl" and "intl", for instance.

.. toctree:: :titlesonly:

installing_composer
installing_manual
running
worker_mode
troubleshooting
deployment
../changelogs/index
upgrading
repositories