Keyword functionality example

SMS Keyword

<?php

/**
 * Include twilio-php, the official Twilio PHP Helper Library, which can be found at
 * http://www.twilio.com/docs/libraries
 */ 
include('Services/Twilio.php');

/* ## Controller ## */
function index(){
	$response = new Services_Twilio_Twiml();
	$response->sms('Reply with one of the following keywords:');
	echo $response;
}

function stop(){
	$response = new Services_Twilio_Twiml();
	$response->sms('You have now unsubscribed. Thank you for trying us out.');
	echo $response;
}

function unsubscribe(){
	$response = new Services_Twilio_Twiml();
	$response->sms('You have now unsubscribed. Thank you for trying us out.');
	echo $response;
}

function start(){
	$response = new Services_Twilio_Twiml();
	$response->sms('Thank you for subscribing!');
	echo $response;
}

function help(){
	$response = new Services_Twilio_Twiml();
	$response->sms('To unsubscribe, reply STOP.');
	echo $response;
}

/* Read the contents of the 'Body' field of the Request. */
$body = $_REQUEST['Body'];

/* Remove formatting from $body until it is just lowercase characters without punctuation or spaces. */
$result = preg_replace("/[^A-Za-z0-9]/u", " ", $body);
$result = trim($result);
$result = strtolower($result);

/* ##Router## */
switch ($result) {
    case 'stop':
        stop();
        break;
    case 'unsubscribe':
        unsubscribe();
        break;
    case 'start':
        start();
        break;
    case 'help':
        help();
        break;
    /* Add new routing logic above this line. */
    default:
        index();
}