Returns the render array for the provided entities.
array $entities: An array of entities implementing EntityInterface to view.
string $view_mode: (optional) The view mode that should be used to render the entity.
string $langcode: (optional) For which language the entity should be rendered, defaults to the current content language.
A render array for the entities, indexed by the same keys as the entities array passed in $entities.
\InvalidArgumentException Can be thrown when the set of parameters is inconsistent, like when trying to view Comments and passing a Node which is not the one the comments belongs to, or not passing one, and having the comments node not be available for loading.
public function viewMultiple(array $entities = array(), $view_mode = 'full', $langcode = NULL);