MatthiasMullie\Scrapbook\KeyValueStore::delete PHP Метод

    public function delete($key);

 /**
  * {@inheritdoc}
  */
 public function delete($key)
 {
     if (!is_string($key)) {
         throw new InvalidArgumentException('Invalid key: ' . serialize($key) . '. Must be string.');
     }
     return $this->store->delete($key);
 }