How To Send Text Messages From Google Voice With PHP

I found this neat PHP class that you can use to send text messages to any phone number from your google voice account. 

<?php
// GoogleVoice(EMAIL, PASSWORD)
$gv = new GoogleVoice('youremail@gmail.com', 'yourpassword');
// Sends an SMS. send_sms(NUMBER, MESSAGE)
echo $gv->send_sms('+91xxxxxxxxxx', 'Test Message');
// Gets all the sms
// get_sms() - returns all the sms
// get_sms(true) - returns all the unread sms
echo $gv->get_sms();
 
/**
  * Google Voice API Wrapper
  * 
  * new GoogleVoice(EMAIL, PASSWORD)
  * send_sms(NUMBER, MESSAGE)
  * get_sms()
  * get_sms(true) - unread
  *
  * @author Artem Kalinchuk
**/
 
Class GoogleVoice {
 /**
   * Modify this
 **/
 var $account_type = 'GOOGLE';  // The Google account type
 var $service = 'grandcentral';  // Service for Google Voice is grandcentral (it may change)
 var $source = '';    // The host of your site (for logging purposes) 
 // _rnr_se - This can be found in the source code of the inbox page of your Google Voice
 // Simply view the source and search for '_rnr_se'. Should be a string of about 30
 // characters (numbers, letters, and symbols)
 var $_rnr_se = ''; 
 
 /**
   * Do not modify
 **/
 var $url = 'https://www.google.com/'; // Google HTTPS URL
 var $auth;         // The AUTH key
 var $email;        // Users email address
 var $password;       // Users password
 
 function __construct ($email, $password) {
  if ($email)
   $this->email = $email;
  if ($password)
   $this->password = $password;
 
  // Authenticate if the Auth key is empty
  if ($this->auth == '') {
   $this->authenticate();
  }
 }
 
 /**
   * authenticate
   * Authenticates using the email and password.
   * @return Auth Session Key
 **/
 
 function authenticate () {
  $form_data = array();
  $form_data['accountType'] = $this->account_type;
  $form_data['Email'] = $this->email;
  $form_data['Passwd'] = $this->password;
  $form_data['service'] = $this->service;
  $form_data['source'] = $this->source;
 
  $response = $this->transmit($form_data, 'accounts/ClientLogin');
  preg_match("/Auth\=(.*)/", $response, $matches);
 
  if (count($matches) == 0) {
   return $response;
  } else {
   $this->auth = str_replace("Auth=", "", $matches[0]);
   return $this->auth;
  }
 }
 
 /**
   * transmit
   * Transmits the passed in POST data
   * @param $form_data An array of POST fields and values
   * @param $path The path to call
   * @return Response from the server
 **/
 
 function transmit ($form_data, $path, $USE_POST=true) {
  $url = $this->url.$path;
  $fields = array();
 
  foreach ($form_data as $field => $value)
   $fields[] = $field.'='.urlencode($value);
 
  // POST or GET?
  if ($USE_POST) {
   $ch = curl_init($url);
   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
   curl_setopt($ch, CURLOPT_POST, count($form_data));
   curl_setopt($ch, CURLOPT_POSTFIELDS, implode('&', $fields));
   curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
   curl_setopt($ch, CURLOPT_HTTPHEADER, array( 

"Content-Type: application/x-www-form-urlencoded", 

"Authorization: GoogleLogin auth=".$this->auth));
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  } else {
   $ch = curl_init($url.'?'.implode('&', $fields));
   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
   curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  }
 
  $response = curl_exec($ch);
 
  return $response;
 }
 
 /**
   * send_sms
   * Sends an SMS message
   * @param $phone_number The number to send the SMS message to
   * @param $text The message
   * @return Response from the server (success or fail)
 **/
 
 function send_sms ($phone_number, $text) {
  $form_data = array();
  $form_data['phoneNumber'] = $phone_number;
  $form_data['text'] = $text;
  $form_data['id'] = '';
  $form_data['_rnr_se'] = $this->_rnr_se;
 
  $response = $this->transmit($form_data, 'voice/sms/send/');
 
  return $response;
 }
 
 /**
   * get_sms
   * Gets the HTML of the SMS inbox
   * @param $UNREAD boolean - Show unread or not
   * @return The HTML from the SMS inbox page
 **/
 
 function get_sms($UNREAD=false) {
  $form_data = array();
  $form_data['auth'] = $this->auth;
 
  if ($UNREAD)
   $path = 'voice/inbox/recent/unread/';
  else
   $path = 'voice/inbox/recent/';
 
  $response = $this->transmit($form_data, $path, false);
 
  return $response;
 }
}
?>