public function getPlaceholder($name, $sanitize = null)
    {
        list($name, $placeholders, $template) = $this->getParentPlaceholder($name);
        if ($template === false) {
            if ($this->throwException) {
                if (is_array($name)) {
                    $name = implode('.', $name);
                }
                throw new TemplateException("Unknown scope: {$name}");
            }
            return null;
        }
        return $this->sanitize(ArrayHelper::getValue($placeholders, $name), $sanitize);
    }