php微信开发之谷歌测距

<?php
/**
 * wechat php test
 */

//define your token
define("token", "weixin");
$wechatobj = new wechatcallbackapitest();
//$wechatobj->valid();
$wechatobj->responsemsg();
class wechatcallbackapitest
{
  public function valid()
  {
    $echostr = $_get["echostr"];

    //valid signature , option
    if($this->checksignature()){
      echo $echostr;
      exit;
    }
  }

  public function responsemsg()
  {
    //get post data, may be due to the different environments
    $poststr = $globals["http_raw_post_data"];

    //extract post data
    if (!empty($poststr)){

        $postobj = simplexml_load_string($poststr, 'simplexmlelement', libxml_nocdata);
        $fromusername = $postobj->fromusername;
        $tousername = $postobj->tousername;
        $type = $postobj->msgtype;
        $customrevent = $postobj->event;
        $latitude = $postobj->location_x;
        $longitude = $postobj->location_y;
        $keyword = trim($postobj->content);
        $time = time();
        $texttpl = "<xml>
              <tousername><![cdata[%s]]></tousername>
              <fromusername><![cdata[%s]]></fromusername>
              <createtime>%s</createtime>
              <msgtype><![cdata[%s]]></msgtype>
              <content><![cdata[%s]]></content>
              <funcflag>0</funcflag>
              </xml>";       
        switch ($type)
      {  case "event";
        if ($customrevent=="subscribe")
          {$contentstr = '';}
        break;
        case "image";
        $contentstr = "你的图片很棒！";
        break;
        case "location";
        $disurl="http://maps.googleapis.com/maps/api/distancematrix/xml?origins={$latitude},{$longitude}&destinations=23.355164,116.681889&mode=walking&language=zh-cn&sensor=false";
      $apistr=file_get_contents($disurl);
      $apiobj=simplexml_load_string($apistr);
      $disobj=$apiobj->row->element->distance->text;
      $durobj=$apiobj->row->element->duration->text;
      $contentstr = "你离我公司约{$disobj}公里，步行约{$durobj}";

        break;
        case "link" ;
        $contentstr = "你的链接有病毒吧！";
        break;
        case "text";
        $weatherurl="http://api.map.baidu.com/telematics/v2/weather?location={$keyword}&ak=1a3cde429f38434f1811a75e1a90310c";
         $apistr=file_get_contents($weatherurl);
         $apiobj=simplexml_load_string($apistr);
         $placeobj=$apiobj->currentcity;//读取城市
         $todayobj=$apiobj->results->result[0]->date;//读取星期
         $weatherobj=$apiobj->results->result[0]->weather;//读取天气
         $windobj=$apiobj->results->result[0]->wind;//读取风力
         $temobj=$apiobj->results->result[0]->temperature;//读取温度
         $contentstr = "{$placeobj}{$todayobj}天气{$weatherobj}，风力{$windobj}，温度{$temobj}";
         break;          
      default;
      $contentstr ="此项功能尚未开发";  
      }
        $msgtype="text";
        $resultstr = sprintf($texttpl, $fromusername, $tousername, $time, $msgtype, $contentstr);
        echo $resultstr;


    }else {
      echo "";
      exit;
    }
  }

  private function checksignature()
  {
    $signature = $_get["signature"];
    $timestamp = $_get["timestamp"];
    $nonce = $_get["nonce"];  

    $token = token;
    $tmparr = array($token, $timestamp, $nonce);
    sort($tmparr);
    $tmpstr = implode( $tmparr );
    $tmpstr = sha1( $tmpstr );

    if( $tmpstr == $signature ){
      return true;
    }else{
      return false;
    }
  }
}

?>