I am working on this function.buts its not sending text message($msg) to user($to)

function sendSMS($mobile, $msg, $sender, $sendPass, $sendID)
        $ch = curl_init();
        //echo $url;
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_POST, 1)or die("error1");
        curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
        $data = curl_exec($ch);
        return $data;
        //return substr($data,0,1);

yes twiss.It is abksms.com
Its showing correct value in $url
When we execute this $url value in the browswr,its working i.e. sending sms.
but all the code after $url not working