/**
  * {@inheritdoc}
  */
 public function saveAll(array $optionNamesToValues)
 {
     foreach ($optionNamesToValues as $optionName => $optionValue) {
         $this->_wpFunctions->update_option(self::$_optionPrefix . $optionName, $optionValue);
     }
     /*
      * WordPress API is silly.
      *
      * http://codex.wordpress.org/Function_Reference/update_option
      */
     return null;
 }