Example 2: Adding a custom font to the heading elementphp \OCP\Util::addStyle(" h1 { font-family: 'Open Sans', sans-serif; } "); ``` Both of these examples demonstrate how to use the addStyle method to add custom CSS styles to a web page. The PHP OCP Util package library is part of the ownCloud app development framework, which provides developers with a set of tools and resources for building ownCloud applications. The OCP Util package is specifically designed to provide utility functions for common tasks, such as adding styles to a web page.