public Entity::getOriginalId()
Gets the original ID.
int|string|null The original ID, or NULL if no ID was set or for entity types that do not support renames.
Overrides EntityInterface::getOriginalId
public function getOriginalId() { // By default, entities do not support renames and do not have original IDs. return NULL; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Entity.php/function/Entity::getOriginalId/8.1.x