首先把商家的经纬度存数据库



/**
   * @param string $address 地址
   * @param string $city  城市名
   * @return array
   */
public  function getLatLng($address='',$city=''){
      $result = array();
      $ak = '';//您的百度地图ak，可以去百度开发者中心去免费申请
      $url ="http://api.map.baidu.com/geocoder/v2/?callback=renderOption&output=json&address=".$address."&city=".$city."&ak=".$ak;
      $data = file_get_contents($url);
      $data = str_replace('renderOption&&renderOption(', '', $data);
      $data = str_replace(')', '', $data);
      $data = json_decode($data,true);
      if (!empty($data) && $data['status'] == 0) {
          $result['lat'] = $data['result']['location']['lat'];
          $result['lng'] = $data['result']['location']['lng'];
          return $result;//返回经纬度结果
      }else{
          return null;
      }
}


前台获取用户的经纬度地址，获取用户城市。



<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=C03899adf85230a417ad037197e5bd88"></script>
<script>
        var geolocation = new BMap.Geolocation();
        geolocation.getCurrentPosition(function(r) {
            if (this.getStatus() == BMAP_STATUS_SUCCESS) {
                var url = "__MODULE__/Common/location";
                var lng = r.point.lng;
                var lat = r.point.lat;
                $.post(url, {lng: lng, lat: lat},function(data){
                    if (data == 1) {
                        return false;
                    }else{
                        lyaer.msg('定位失败');
                    }
                });

            }else {
                lyaer.msg('failed' + this.getStatus());
            }
        }, {enableHighAccuracy: true})
</script>


 

 

 



/**
 * 定位
 * @return [type] [description]
 */
public function location()
{
    $lng = I('post.lng');
    $lat = I('post.lat');
    if (!$lng || !$lat) {
        $this->ajaxReturn(0);
    }
    $url = 'http://api.map.baidu.com/geocoder/v2/?ak=C03899adf85230a417ad037197e5bd88&callback=renderReverse&location=' . $lat . ',' . $lng . '&output=json&pois=1';
    $content = file_get_contents($url);
    //dump($content); die();
    preg_match('/"district":"(.*?)",/msi', $content, $matches);
    $city = $matches[1];
    if ($city) {
        $city_id = M('mall_zone')->where('kindname = "' . $city . '"')->getField('pid as id');
        if ($city_id) {
            cookie('lng',$lng);
            cookie('lat',$lat);
            cookie('city',$city);
            cookie('city_id', $city_id);
            $this->ajaxReturn(1);
        } else {
            $this->ajaxReturn(0);
        }
    }
}

/**
 *根据用户商家的经纬度，获取附近的商家
 */
public function myNearShop(){
    $slat = session('lat');
    $slng = session('lng');
    $sql =  "SELECT *, ROUND(6378.138*2*ASIN(SQRT(POW(SIN(($slat*PI()/180-lat*PI()/180)/2),2)+COS($slat*PI()/180)*COS(lat*PI()/180)*POW(SIN(($slng*PI()/180-lng*PI()/180)/2),2)))) AS juli 
    FROM sline_mall where is_check = 1 HAVING juli <= 5";
    $shop =  M('mall')->query($sql);
    $this->assign('shop',$shop);
}