CodeIgniter - Optional parameters

I've found the correct result:

$route['controllername/(:any)/(:any)/(:num)'] = 'ddd/index/$1/$2/$3';$route['controllername/(:any)/(:num)'] = 'ddd/index/$1/null/$2'; // try 'null' or '0' (zero)$route['controllername/(:any)'] = 'ddd/index/$1';

The Index method (inside "ControllerName") should be:

public function Index($uf = '', $slug = '', $pag = 0){    // some code...    if (intval($pag) > 0)    {        // pagination    }    if (!empty($slug))    {        // slug manipulation    }}

Hope it helps someone.Thank you all.

public function my_test_function($not_optional_param, $optional_param = NULL)  {    //do your stuff here  }

have you tried this?

For example, let’s say you have a URI like this:

1. example.com/index.php/mycontroller/myfunction/hello/world
2. example.com/index.php/mycontroller/myfunction/hello

Your method will be passed URI segments 3 and 4 (“hello” and “world”):

class MyController extends CI_Controller {

public function myFunction($notOptional, $optional = NULL){    echo $notOptional; // will return 'hello'.    echo $optional; // will return 'world' using the 1st URI and 'NULL' using the 2nd.}

}

Reference: https://codeigniter.com/user_guide/general/controllers.html