In what ways can PHP configuration settings be adjusted to manage file size limits and prevent unnecessary traffic usage on a website?

To manage file size limits and prevent unnecessary traffic usage on a website, PHP configuration settings such as `upload_max_filesize`, `post_max_size`, and `max_input_time` can be adjusted. By increasing these settings, you can allow larger file uploads and prevent timeouts during file uploads. Additionally, using client-side validation and limiting the number of file uploads can help in managing traffic usage.

// Adjust PHP configuration settings to manage file size limits and prevent unnecessary traffic usage
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '25M');
ini_set('max_input_time', 300);