public Entity::id()
Gets the identifier.
string|int|null The entity identifier, or NULL if the object does not yet have an identifier.
Overrides EntityInterface::id
public function id() { return isset($this->id) ? $this->id : NULL; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Entity.php/function/Entity::id/8.1.x