Class for using the google distance api

google-distance-matrix.php

<?php

class omfGoogleDistanceMatrix {
  protected $origins = array();
  protected $destinations = array();
  protected $unit = 'imperial';
  protected $mode = 'driving';
  protected $language = 'en';
  protected $api_key = '';
  protected $endpoint = 'https://maps.googleapis.com/maps/api/distancematrix/json';
  public function __construct($api_key = '') {
    if (!empty($api_key)) {
      $this->set_api_key($api_key);
    }
  }
  public function set_api_key($api_key) {
    $this->api_key = $api_key;
  }
  public function set_unit($unit) {
    $this->unit = $unit;
  }
  public function set_mode($mode) {
    $this->mode = $mode;
  }
  public function set_language($language) {
    $this->language = $language;
  }
  public function add_origin($origin) {
    $this->origins[] = $origin;
  }
  public function add_destination($destination) {
    $this->destinations[] = $destination;
  }
  public function get_api_api_key() {
    return $this->api_key;
  }
  public function get_unit() {
    return $this->unit;
  }
  public function get_mode() {
    return $this->mode;
  }
  public function get_language() {
    return $this->language;
  }
  public function get_distance() {
    return $this->make_request();
  }
  protected function make_request() {
    $origins = implode('|', $this->origins);
    $destinations = implode('|', $this->destinations);
    $query_string = '?';
    $query_string .= 'origins=' . $origins;
    $query_string .= '&destinations=' . $destinations;
    $query_string .= '&key=' . $this->api_key;
    $query_string .= '&mode=' . $this->mode;
    $query_string .= '&unit=' . $this->unit;
    $query_string .= '&language=' . $this->language;
    $query_string = str_replace(' ', '+', $query_string);
    $url = $this->endpoint . $query_string;
    dsm($url);
    try {
      $ch = curl_init($url);
      $response = curl_exec($ch);
      curl_close($ch);
      return $response;
    }
    catch (Exception $e) {
      drupal_set_message($e->getMessage(), 'error');
    }
  }
}