Piwik\DataTable\Renderer\Csv::convertToUnicode PHP Метод

    private function convertToUnicode($str)
    {
        if ($this->convertToUnicode && function_exists('mb_convert_encoding')) {
            $str = chr(255) . chr(254) . mb_convert_encoding($str, 'UTF-16LE', 'UTF-8');
        }
        return $str;
    }