public ContentEntityBase::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.
Overrides RevisionableInterface::getRevisionId
public function getRevisionId() { return $this->getEntityKey('revision'); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!ContentEntityBase.php/function/ContentEntityBase::getRevisionId/8.1.x