How to check codeigniter version in documentation

Thank you for your comment.

PR means "Pull Request". It is a word in GitHub.
See
https://github.com/codeigniter4/CodeIgni.../README.md
https://docs.github.com/en/pull-requests...l-requests

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When you use Composer to install CodeIgniter:

Code:

$ composer show | grep codeigniter
codeigniter4/framework            v4.1.8  The CodeIgniter framework v4

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper