get tdl with domain

function get_tdl($domain) {
	$url = "https://www.whoisxmlapi.com/whoisserver/WhoisService?apiKey=at_n1RvT8WtFZzsE1fKiQ2k3qleoOiE3&domainName=" . $domain . "&outputFormat=json";
	$data = file_get_contents($url);
	return $data;
}