$timezone = \Illuminate\Support\Facades\Config::get('app.timezone');
\Illuminate\Support\Facades\Config::set('app.debug', true);
if (\Illuminate\Support\Facades\Config::has('app.url')) { // Do something }This code checks if the `url` key is defined in the `config/app.php` configuration file. By using the `Config` facade, developers can easily read, modify, and check configuration values without having to worry about the underlying details of the configuration system. This package/library can be identified as part of the `Illuminate\Support` package of Laravel.