$enabled = true; $is_enabled_text = ilUtil::yn2tf($enabled); // $is_enabled_text now contains 'yes'This code converts the boolean variable `$enabled` to a human-readable string using `yn2tf()` and stores it in the variable `$is_enabled_text`. The resulting string is `'yes'`, since `$enabled` is `true`. The `ilUtil` class is part of the ILIAS package library, which provides a set of reusable components for building e-learning applications. Other classes in this library include `ilTemplate`, which provides a simple way to generate HTML templates, and `ilLogger`, which provides logging functionality.