PHP-DI Call a method which have default parameter to null

Question

I'm trying to use a PHP-DI Call on a method which have a default parameter but i get this error

Fatal error: Uncaught Invoker\\Exception\\NotEnoughParametersException: Unable to invoke the callable because no value was given for parameter 1...

PS : PHP-DI 6

  Classe Bill
  {

  public function index($slug=null,Request $request){
            //----
       }
  }

use DI\ContainerBuilder;

$containerBuilder = new ContainerBuilder;
$container = $containerBuilder->build();

$controller = 'Bill' ;
$method = 'index';
$parameters = []; 
$response = $container->call([$controller,$method], $parameters);

Answer 1

Works:

class TestController { function doAction(Request $request, int $id = null) {} }

Does not work:

class TestController { function doAction(int $id = null, Request $request) {} }

Source: https://github.com/PHP-DI/Slim-Bridge/issues/37#issuecomment-368954250

Answer 2

You need to provide a value for the parameter $slug .

When a parameter is optional before non-optional parameters it cannot be omitted. So you have to provide its value.