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    public static function UTF8StringToArray($str, $isunicode=true, &$currentfont) {
        if ($isunicode) {
            // requires PCRE unicode support turned on
            $chars = TCPDF_STATIC::pregSplit('//','u', $str, -1, PREG_SPLIT_NO_EMPTY);
            $carr = array_map(array('TCPDF_FONTS', 'uniord'), $chars);
        } else {
            $chars = str_split($str);
            $carr = array_map('ord', $chars);
        }
        if (is_array($currentfont['subsetchars']) && is_array($carr)) {
            $currentfont['subsetchars'] += array_fill_keys($carr, true);
        } else {
            $currentfont['subsetchars'] = array_merge($currentfont['subsetchars'], $carr);
        }
        return $carr;
    }