How can PHP Slim be customized and further developed without using the "use" keyword?

To customize and further develop PHP Slim without using the "use" keyword, you can manually include the required classes or dependencies within your code using the fully qualified class name. This approach allows you to avoid using the "use" keyword and still access the necessary functionality.

<?php

// Example of including required classes without using "use" keyword
$app = new \Slim\App();
$container = $app->getContainer();
$container['logger'] = function($c) {
    return new \Monolog\Logger('my_logger');
};

// Accessing the logger without using "use" keyword
$logger = $container['logger'];
$logger->info('Log message');