Issues with twilio sms module in PhP - php

Question

I am trying to test the twilio sms reminder library with a trial account I created for this purpose. The problem is that when I launch the file from my XAMPP "webroot" folder that also contains the "Twilio" folder I see nothing, just a blank page on Mozilla Firefox while on IE the error code 500 is up. Please find my code below thank you.
<?php
require $_SERVER['DOCUMENT_ROOT']."/openemr/twilio/Services/Twilio.php";
// Step 2: set our AccountSid and AuthToken from www.twilio.com/user/account
$AccountSid = "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy";
$AuthToken = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
// Step 3: instantiate a new Twilio Rest Client
$client = new Services_Twilio($AccountSid, $AuthToken);
// Step 4: make an array of people we know, to send them a message.
// Feel free to change/add your own phone number and name here.
$people = array(
"[phone]" => "Curious George",
"[phone]" => "Boots",
"[phone]" => "Virgil",
);
// Step 5: Loop over all our friends. $number is a phone number above, and
// $name is the name next to it
foreach ($people as $number => $name) {
$sms = $client->account->messages->sendMessage(
// Step 6: Change the 'From' number below to be a valid Twilio number
// that you've purchased, or the (deprecated) Sandbox number
"[phone]",
// the number we are sending to - Any phone number
$number,
// the sms body
"Hey $name, Monkey Party at 6PM. Bring Bananas!"
);
// Display a confirmation message on the screen
echo "Sent message to $name";
}