Symfony\Component\Console\Application::splitStringByWidth PHP Method

    private function splitStringByWidth($string, $width)
    {
        // str_split is not suitable for multi-byte characters, we should use preg_split to get char array properly.
        // additionally, array_slice() is not enough as some character has doubled width.
        // we need a function to split string not by character count but by string width
        if (false === ($encoding = mb_detect_encoding($string, null, true))) {
            return str_split($string, $width);
        }
        $utf8String = mb_convert_encoding($string, 'utf8', $encoding);
        $lines = array();
        $line = '';
        foreach (preg_split('//u', $utf8String) as $char) {
            // test if $char could be appended to current line
            if (mb_strwidth($line . $char, 'utf8') <= $width) {
                $line .= $char;
                continue;
            }
            // if not, push current line to array and make new line
            $lines[] = str_pad($line, $width);
            $line = $char;
        }
        if ('' !== $line) {
            $lines[] = count($lines) ? str_pad($line, $width) : $line;
        }
        mb_convert_variables($encoding, 'utf8', $lines);
        return $lines;
    }