How to integrate way2sms in php?

Question

I would like to integrate way2sms api in php code. here my sample code , its error free but no message is sending . friends please help me where i have did mistake ? what do i need to change ?

sms.php

<?php
    $uid='9876543210';//10 digit mobile number
    $pwd='password';
    $phone='9876543210';
    $msg='from way 2 sms master ' ;

    include ('way2sms-api.php');
    $res= sendWay2SMS ( $uid , $pwd , $phone , $msg);

way2sms-api.php

<?php
    function sendWay2SMS($uid, $pwd, $phone, $msg) {
        $timeout = 30;
        $result = array();
        $uid = urlencode($uid);
        $pwd = urlencode($pwd);
        $autobalancer = rand(1, 8);

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, "http://site".$autobalancer.".way2sms.com/Login1.action");
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, "username=".$uid."&password=".$pwd."&button=Login");
        //curl_setopt($curl , CURLOPT_PROXY , '144.16.192.218:8080' );
        curl_setopt($curl, CURLOPT_COOKIESESSION, 1);
        curl_setopt($curl, CURLOPT_COOKIEFILE, "cookie_way2sms");
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($curl, CURLOPT_MAXREDIRS, 20);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5");
        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $timeout);
        curl_setopt($curl, CURLOPT_REFERER, "http://site".$autobalancer.".way2sms.com/");

        $text = curl_exec($curl);

        // Check if any error occured
        if (curl_errno($curl)) return "access error : ". curl_error($curl);

        // Check for proper login
        $pos = stripos(curl_getinfo($curl, CURLINFO_EFFECTIVE_URL), "Main.action");
        if ($pos === "FALSE" || $pos == 0 || $pos == "") return "invalid login";
        if (trim($msg) == "" || strlen($msg) == 0) return "invalid message";

        $msg = urlencode(substr($msg, 0, 160));
        $pharr = explode(",", $phone);
        $refurl = curl_getinfo($curl, CURLINFO_EFFECTIVE_URL);

        curl_setopt($curl, CURLOPT_REFERER, $refurl);
        curl_setopt($curl, CURLOPT_URL, "http://site".$autobalancer.".way2sms.com/jsp/InstantSMS.jsp");
        $text = curl_exec($curl);

        preg_match_all('/<input[\s]*type="hidden"[\s]*name="Action"[\s]*id="Action"[\s]*value="?([^>]*)?"/si', $text, $match);
        $action = $match[1][0]; // get custid from the form fro the Action field in the post form

        foreach ($pharr as $p) {
            if (strlen($p) != 10 || !is_numeric($p) || strpos($p, ".") != false) {
                $result[] = array('phone' => $p, 'msg' => urldecode($msg), 'result' => "invalid number");
                continue;
            }

            $p = urlencode($p);

            // Send SMS
            curl_setopt($curl, CURLOPT_URL, 'http://site'.$autobalancer.'.way2sms.com/quicksms.action');
            curl_setopt($curl, CURLOPT_REFERER, curl_getinfo($curl, CURLINFO_EFFECTIVE_URL));
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, "HiddenAction=instantsms&bulidgpwd=*******&bulidguid=username&catnamedis=Birthday&chkall=on&gpwd1=*******&guid1=username&ypwd1=*******&yuid1=username&Action=".$action."&MobNo=".$p."&textArea=".$msg);

            $contents = curl_exec($curl);

            //Check Message Status
            //preg_match_all('/<span class="style1">?([^>]*)?<\/span>/si', $contents, $match);
            //$out=str_replace("&nbsp;","",$match[1][0]);
            $pos = strpos($contents, 'Message has been submitted successfully');
            $res = ($pos !== false) ? true : false;
            $result[] = array('phone' => $p, 'msg' => urldecode($msg), 'result' => $res);

        }

        //echo $text;

        // Logout
        curl_setopt($curl, CURLOPT_URL, "http://site".$autobalancer.".way2sms.com/LogOut");
        curl_setopt($curl, CURLOPT_REFERER, $refurl);
        $text = curl_exec($curl);
        curl_close($curl);
        return $result;
    }