How to add a method to a class if the class cannot be overridden?

Question

symfony

different application services return objects of different types
$searchResults
$someOtherResults
$arrayOfValueObjects
if there is no way to override them, how to make them "reduce to a common denominator"

foreach(array_merge($searchResults, $someOtherResults, $arrayOfValueObjects) as $item) {
     $item->render();
}

Answer 1

wrap the work with these services in another service that will actually act as a facade and hide all the dirt that you are doing so that it would be convenient.