In this example, the `locale_accept_from_http()` function is used to determine the user's browser language. The `setlocale()` function is then used to set the locale for the current application, and the `strftime()` function is used to format the date based on the user's locale. AppLocale is part of the PHP Internationalization (Intl) extension, which provides a number of functions for handling multilingual and cultural issues.