Array in Array with “OR” Criteria

I’m generating a userlist from WordPress and I want to display users which have the role subscriber or editor:

$args = array(
    'role' => array('subscriber','editor'),
    'meta_key' => 'last_name',
    'orderby' => 'meta_value',
    'order' => 'ASC',
);

So with that code, the user must have both roles subscriber and editor. What do I need to change so that the role is an “OR” criteria?

Related posts