http://example.com/search.php?q=php&category=programmingIn this example, a user searches for something using the search form and is redirected to the `search.php` page with query parameters `q` and `category` in the URL. In the PHP script, we check if these parameters are set in the $_GET array and then display the search query and category information. It's hard to determine the package library used for these examples as it's standard PHP functionality.