How to send an SMS using Twilio SMS REST API

gistfile1.php

<?php
//get this from twillio website
require "twilio.php";

class Twillio_SMS
{
	var $ApiVersion;
	var $AccountSid;
	var $AuthToken;
	var $smsServer;

  function __construct()
{
	$this->ApiVersion = "2008-08-01";
	$this->AccountSid = "Axxxxxxxxxxxxxxxxxxxxxxxxxx";
	$this->AuthToken = "axxxxxxxxxxxxxxxxxxxxxxxxxxx";
	$this->smsServer = new TwilioRestClient($this->AccountSid, $this->AuthToken);
}

function sendSMS($to, $from, $whattosend)
{

	$response = $this->smsServer->request("/$this->ApiVersion/Accounts/$this->AccountSid/SMS/Messages", 
			"POST", array(
			"To" => $to,
			"From" => $from,
			"Body" => $whattosend
		));
		if($response->IsError)
			echo "Error: {$response->ErrorMessage}";
		else
			echo "Sent message to $name";



}


function __destruct()
{

	unset($this->ApiVersion);
	unset($this->AccountSid);
	unset($this->AuthToken); 
        unset($this->CallerID);

}

}


$s= new Twillio_SMS;
$s->sendSMS('4155992671','4155992671','this is a test');

?>