public RevisionableInterface::getRevisionId()
Gets the revision identifier of the entity.
The revision identifier of the entity, or NULL if the entity does not have a revision identifier.
public function getRevisionId();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!RevisionableInterface.php/function/RevisionableInterface::getRevisionId/8.1.x