CDavAddressbookBase::encodeUrn

private function encodeUrn($uri): string
{
	global $APPLICATION;

	$result = '';
	$parts = preg_split("#(://|:\d+/|/|\?|=|&)#", $uri, -1, PREG_SPLIT_DELIM_CAPTURE);

	foreach($parts as $i => $part)
	{
		$result .= ($i % 2)
			? $part
			: rawurlencode(BitrixMainTextEncoding::convertEncoding($part, LANG_CHARSET, 'UTF-8'));
	}

	return $result;
}