In the context of the provided code, how can the functionality of including files be optimized to handle different types of user actions and parameters efficiently?

The functionality of including files can be optimized by creating a centralized function that handles different types of user actions and parameters efficiently. This function can take in parameters such as the action to be performed and any necessary data, then dynamically include the relevant files based on the user input. By using this approach, the code becomes more modular, maintainable, and scalable.

function includeFile($action, $data = null) {
    switch($action) {
        case 'view':
            include 'view.php';
            break;
        case 'edit':
            include 'edit.php';
            break;
        case 'delete':
            include 'delete.php';
            break;
        default:
            include 'default.php';
            break;
    }
}

// Example of how to use the function
$action = $_GET['action'];
includeFile($action);