Twilio, is not funcion

I need help integration, Twilio SMS
<?php

// Require the bundled autoload file - the path may need to change

// based on where you downloaded and unzipped the SDK

require DIR . '/twilio-php-master/Twilio/autoload.php';
// Use the REST API Client to make requests to the Twilio REST API

use Twilio\Rest\Client;
// Your Account SID and Auth Token from twilio.com/console'>twilio.com/console

$sid = 'ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';

$token = 'xxxxxxxxxxxxxxxxxxxxxxx';

$client = new Client($sid, $token);
// Use the client to do fun stuff like send text messages!

$client->messages->create(

// the number you'd like to send the message to

'+xxxxxxxxxxxxxxxxxxxxx',

array(

// A Twilio phone number you purchased at twilio.com/console'>twilio.com/console

'from' => '+xxxxxxxxxxxxxxxxxxxxxxx',

// the body of the text message you'd like to send

'body' => "Hey Jenny! Good luck on the bar exam!"

)

);
Need possibilit, integration, my database.
Thank you,
Att.

Junior