public EntityStorageInterface::loadMultiple(array $ids = NULL)
Loads one or more entities.
$ids: An array of entity IDs, or NULL to load all entities.
\Drupal\Core\Entity\EntityInterface[] An array of entity objects indexed by their IDs. Returns an empty array if no matching entities are found.
public function loadMultiple(array $ids = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityStorageInterface.php/function/EntityStorageInterface::loadMultiple/8.1.x