public Entity::uuid()
Gets the entity UUID (Universally Unique Identifier).
The UUID is guaranteed to be unique and can be used to identify an entity across multiple systems.
string|null The UUID of the entity, or NULL if the entity does not have one.
Overrides EntityInterface::uuid
public function uuid() { return isset($this->uuid) ? $this->uuid : NULL; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Entity.php/function/Entity::uuid/8.1.x