根据地址获取经纬度以及计算两个经纬度之间的距离

/**
 * 获取经纬度
 * $keyword：地址详情
 */
function get_location($keyword){
    $header[] = 'Referer: http://lbs.qq.com/webservice_v1/guide-suggestion.html';
    $header[] = 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36';
    $url = "http://apis.map.qq.com/ws/place/v1/suggestion/?&region=&key=3RCBZ-WY66F-XSMJ3-NXBO3-MH7LT-FSBRX&keyword=".$keyword;
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch,CURLOPT_HTTPHEADER,$header);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);

    //执行并获取HTML文档内容
    $output = curl_exec($ch);
    //释放curl句柄
    curl_close($ch);
    // return $output;
    $result = json_decode($output,true);

    if(!empty($result['data'])){
        $res = $result['data'][0];
    }else{
        $res = '';
    }
    // print_r($result);
    return $res;

}

计算两个经纬度之间的距离

/**
 * 计算两点地理坐标之间的距离
 * @param  Decimal $longitude1 起点经度
 * @param  Decimal $latitude1  起点纬度
 * @param  Decimal $longitude2 终点经度
 * @param  Decimal $latitude2  终点纬度
 * @param  Int     $unit       单位 1:米 2:公里
 * @param  Int     $decimal    精度 保留小数位数
 * @return Decimal
 */
function get_distance($longitude1, $latitude1, $longitude2, $latitude2, $unit=2, $decimal=2){
    $EARTH_RADIUS = 6370.996; // 地球半径系数
    $PI = 3.1415926;
    $radLat1 = $latitude1 * $PI / 180.0;
    $radLat2 = $latitude2 * $PI / 180.0;
    $radLng1 = $longitude1 * $PI / 180.0;
    $radLng2 = $longitude2 * $PI /180.0;
    $a = $radLat1 - $radLat2;
    $b = $radLng1 - $radLng2;
    $distance = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1) * cos($radLat2) * pow(sin($b/2),2)));
    $distance = $distance * $EARTH_RADIUS * 1000;
    if($unit==2){
        $distance = $distance / 1000;
    }
    return round($distance, $decimal);
}

获取符合条件的店铺列表：

 /**
     * 附近8km的店铺
     */
    public function place(){
        $lat = $this->request->post('lat');	//当前维度
        $lng = $this->request->post('lng');//当前经度
        $t = date('H:i:s');
        $where = [
            ['status', '=', 1],
            ['level', '<>', 0],
            ['open_time', '<=', $t],
            ['close_time', '>=', $t],
        ];
        $list = admin::where($where)->select()->toArray();		//所有店铺列表
        $arr = [];
        foreach ($list as $k => &$v){
            $distance = get_distance($lng,$lat,$v['longitude'],$v['latitude']);
            $v['distance'] = $distance;
            if($distance >8){
                continue;
            }
            array_push($arr,$v);
        }

        if(empty($arr)){
            $sort = [
                'direction' => 'SORT_ASC', //排序顺序标志 SORT_DESC 降序；SORT_ASC 升序
                'field'     => 'distance',       //排序字段
            ];
            $arrSort = [];
            foreach($arr AS $uniqid => $row){
                foreach($row AS $key=>$value){
                    $arrSort[$key][$uniqid] = $value;
                }
            }
            if($sort['direction']){
                array_multisort($arrSort[$sort['field']], constant($sort['direction']), $arr);
            }
            $this->success('admin店铺',$list);
        }
        $this->success('访问成功',$arr);
    }