Create new class instance from function return value - one-liner

Question

Does there exist a one-liner (yes, I love them) to create new instance of a class based on the returned string of a function?

$obj = new {functionThatReturnsAStringValue()}();

Answer 1

I understand what you want, but i think you can do it that way:

$obj = ($class = functionThatReturnsAStringValue()) ? new $class() : null;

Answer 2

function getObject()
{
  return 'DateTime';
}

$datetime = call_user_func(function ($obj) { return new $obj; }, getObject());