utf8Decode example

    private static function mapCodePoints($input, array $options, Info $info)
    {
        $str = '';
        $useSTD3ASCIIRules = $options['UseSTD3ASCIIRules'];
        $transitional = $options['Transitional_Processing'];

        foreach (self::utf8Decode($input) as $codePoint) {
            $data = self::lookupCodePointStatus($codePoint, $useSTD3ASCIIRules);

            switch ($data['status']) {
                case 'disallowed':
                    $info->errors |= self::ERROR_DISALLOWED;

                    // no break.
                case 'valid':
                    $str .= mb_chr($codePoint, 'utf-8');