simpleMessage.php

<?php

// This will send a message using the Tropo session API
// and POST replies to the URL of your choice. 
//
// To send a message, invoke the session API using parameters
// to, msg, and network (optional, defaults to SMS) like this
// http://api.tropo.com/1.0/sessions?action=create&token=TOKEN&to=NUMBER&msg=MESSAGE&network=NETWORK
// 
// Replies will be posted as a regular form post to your url
// using the following form variables:
//   * to - the number this was sent to
//   * from - the number the reply was sent from
//   * msg - the message they sent


// Settings!
$url = 'http://example.com'; // Tropo will POST incoming messages here
$username = ''; // using HTTP Auth on your URL?
$password = ''; // using HTTP Auth on your URL?

// Defaults
$network = isset($network) ? $network : 'SMS';

if ($action == 'create') {
  // this is an outgoing message
  $opts = array('to' => $to, 'network' => $network);
  if (!empty($from)) {
    $opts['callerID'] = $from;
  }
  message($msg, $opts);  
} else {
  // this is an incoming message, capture output.
  answer();
  $response = ask('', array('choices' => '[ANY]'));
  hangup();
  
  // Set up the post to your web server
  $data['msg'] = $response->value;
  $data['to'] = $currentCall->calledID;
  $data['from'] = $currentCall->callerID;
  $param['data'] = $data;
  if (!empty($username)) { $param['username'] = $username; }
  if (!empty($password)) { $param['password'] = $password; }
  $result = post($url, $param);
  _log($result);
}

function post($url, $params) {
    $data = $params['data'];
    $user = $params['username'];
    $pass = $params['password'];
    $method = isset($params['method']) ? $params['method'] : 'POST';
    
    if (is_array($data)) {
      foreach ($data as $key=>$value) {
        $qs .= '&'. urlencode($key) . '=' . urlencode($value);
      }
    }
    $content_length = "".strlen($qs);
    
    // Use curl to send the data to the URL
    $ch = curl_init();
    // this requires POST so add the fields to the POST body
    if ($method == 'POST') {
      curl_setopt($ch, CURLOPT_URL, $url);
      curl_setopt($ch, CURLOPT_POSTFIELDS, $qs);
      curl_setopt($ch, CURLOPT_POST, true);
      curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-type: application/x-www-form-urlencoded"));
      curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Length: $content_length"));
    } else {
      // if this is a GET, use a query string
      curl_setopt($ch, CURLOPT_URL, $url . "?$qs");
    }
    if (!empty($user) && !empty($pass)) {
      curl_setopt($ch, CURLOPT_USERPWD, $user .':'. $pass);      
    }
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $response = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $error = curl_error($ch);

    if ($code != '200') {
      _log("*** curl ERROR: $error ***");
      $response = "$code $error";
    }
    curl_close($ch);
    // make the response available to the rest of the script.
    // We don't use that in this example, but you might decide to
    return $response;
}