gistfile1.txt

'filters' => [ 'invokables' => [ 'fooFilter' => 'My\Namespace\FooFilter']]


class FooFilter implements FilterInterface
{
    public function filter($str) {
        $str = magic_happens($str);
        return $str;
    }
}


class ControllerFactory implements FactoryInterface {
  public function createService(ServiceLocatorInterface $sl) {
    $realSl = $sl->getServiceLocator();
    
    $filterManager = $realSl->get('FilterManager');
    
    return new Controller(
        $filterManager->get('fooFilter')
    );
  }
}

class Controller {
    public functino __construct($filter) {
        $this->filter = $filter;
    }
    
    public function someAction()
    {
        return [
            'filtered_string' => $this->filter->filter('LetTheMagicHappen')
        ];
    }
}