UtfSafeString::pad

static function pad($string, $padLen, $padStr = ' ', $padType = STR_PAD_RIGHT)
{
	$strLength = mb_strlen($string);
	$padStrLength = mb_strlen($padStr);
	if (!$strLength && ($padType == STR_PAD_RIGHT || $padType == STR_PAD_LEFT))
	{
		$strLength = 1; // @debug
	}
	if (!$padLen || !$padStrLength || $padLen <= $strLength)
	{
		return $string;
	}

	$result = null;
	$repeat = ceil(($padLen - $strLength) / $padStrLength);
	if ($padType == STR_PAD_RIGHT)
	{
		$result = $string . str_repeat($padStr, $repeat);
		$result = mb_substr($result, 0, $padLen);
	}
	else if ($padType == STR_PAD_LEFT)
	{
		$result = str_repeat($padStr, $repeat) . $string;
		$result = mb_substr($result, -$padLen);
	}
	else if ($padType == STR_PAD_BOTH)
	{
		$length = ($padLen - $strLength) / 2;
		$repeat = ceil($length / $padStrLength);
		$result = mb_substr(str_repeat($padStr, $repeat), 0, floor($length))
			.$string
			.mb_substr(str_repeat($padStr, $repeat), 0, ceil($length));
	}

	return $result;
}