public EntityInterface::save()
Saves an entity permanently.
When saving existing entities, the entity is assumed to be complete, partial updates of entities are not supported.
int Either SAVED_NEW or SAVED_UPDATED, depending on the operation performed.
\Drupal\Core\Entity\EntityStorageException In case of failures an exception is thrown.
Overrides EntityInterface::save
public function save();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityInterface.php/function/EntityInterface::save/8.1.x