Ouzo\Db\ParameterPlaceHolderCallback::substituteParam PHP Метод

    private function substituteParam()
    {
        $value = $this->_boundValues[$this->_param_index];
        $this->_param_index++;
        if ($value === null) {
            return "null";
        }
        if (is_bool($value)) {
            return Objects::booleanToString($value);
        }
        $value = Db::getInstance()->_dbHandle->quote($value);
        return $value;
    }