Adding subdomain using PHP script?

Can you please help me on how to add a dynamic subdomain to the cpanel of godaddy. Any idea why is it not working? Here is the php script. $whmusername = "sample"; $whmpassword = "sample"; $subdomain = "mytestdomain"; $rootdomain = "sample"; $query = "https://".$rootdomain.".com:2083/cpsess2971083704/json-api/cpanel?cpanel_jsonapi_user=".$whmusername."&cpanel_jsonapi_apiversion=2&cpanel_jsonapi_module=SubDomain&cpanel_jsonapi_func=addsubdomain&domain=".$subdomain."&rootdomain=".$rootdomain."&dir=%2Fpublic_html%2Fdirectory_name&disallowdot=1"; $curl = curl_init(); curl_setopt($curl, CURLOPT_SSL_VERIFYPEER,0); curl_setopt($curl, CURLOPT_SSL_VERIFYHOST,0); curl_setopt($curl, CURLOPT_HEADER,0); curl_setopt($curl, CURLOPT_RETURNTRANSFER,1); $header[0] = "Authorization: Basic " . base64_encode($whmusername.":".$whmpassword) . "\n\r"; curl_setopt($curl, CURLOPT_HTTPHEADER, $header); curl_setopt($curl, CURLOPT_URL, $query); $result = curl_exec($curl); if ($result == false) { error_log("curl_exec threw error \"" . curl_error($curl) . "\" for $query"); } curl_close($curl); print $result;