// Send an SMS using Twilio's REST API and PHP
<?php
$sid = "ACXXXXXX"; // Your Account SID from www.twilio.com/console
$token = "YYYYYY"; // Your Auth Token from www.twilio.com/console

$client = new Twilio\Rest\Client($sid, $token);
$message = $client->messages->create(
  '8881231234', // Text this number
  [
    'from' => '9991231234', // From a valid Twilio number
    'body' => 'Hello from Twilio!'
  ]
);

print $message->sid;

<?php
$sid = "ACXXXXXX"; // Your Account SID from www.twilio.com/console
$token = "YYYYYY"; // Your Auth Token from www.twilio.com/console

$client = new Twilio\Rest\Client($sid, $token);

// Read TwiML at this URL when a call connects (hold music)
$call = $client->calls->create(
  '8881231234', // Call this number
  '9991231234', // From a valid Twilio number
  [
      'url' => 'https://twimlets.com/holdmusic?Bucket=com.twilio.music.ambient'
  ]
);

<?php
$response = new Twilio\TwiML\VoiceResponse();
$response->say('Hello');
$response->play('https://api.twilio.com/cowbell.mp3', ['loop' => 5]);
print $response;