// Assume that $username is a variable containing the user's username $userURL = "http://example.com/users/".$username; // This will output a URL like: http://example.com/users/johndoe
// Assume that $url is a variable containing the desired URL after login if (!isset($_SESSION['user'])) { header('Location: http://example.com/login/?redirect=' . urlencode($url)); exit; }This example checks if a user is logged in and redirects them to the login page if they're not. It also includes a redirect parameter so the user is redirected back to the original URL after logging in. Package/Library: The package/library used for PHP Users URL can vary depending on the specific features and functionality needed. Some popular ones include Laravel, Symfony, and CodeIgniter. However, this functionality can also be implemented using custom PHP code without any external libraries.