根据地理位置来获取最近的商家

后台录入经纬度 http://lbs.amap.com/api/javascript-api/example/map/click-to-get-lnglat

①首先采用微信或者是腾讯地图拉取到用户当前的经纬度 http://lbsyun.baidu.com/index.php?title=jspopular 基于浏览器定位

②调用 squarePoint来获取

define('EARTH_RADIUS', 6378.137);//地球半径
public function squarePoint($lng, $lat, $distance = 0.5)
{

    $dlng = 2 * asin(sin($distance / (2 * EARTH_RADIUS)) / cos(deg2rad($lat)));

    $dlng = rad2deg($dlng);


    $dlat = $distance / EARTH_RADIUS; //EARTH_RADIUS地球半径

    $dlat = rad2deg($dlat);


    return array(

        'left-top' => array('lat' => $lat + $dlat, 'lng' => $lng - $dlng),

        'right-top' => array('lat' => $lat + $dlat, 'lng' => $lng + $dlng),

        'left-bottom' => array('lat' => $lat - $dlat, 'lng' => $lng - $dlng),

        'right-bottom' => array('lat' => $lat - $dlat, 'lng' => $lng + $dlng)

    );
}

③条件判断 进行sql查询

$condition .="AND lat<>0 AND lat >= '{$point['right-bottom']['lat']}' AND lat <= '{$point['left-top']['lat']}' AND lng >= '{$point['left-top']['lng']}' AND lng <= '{$point['right-bottom']['lng']}'";

④@param $lat $lng 是当前定位的经纬度 @param $row['lat'],$row['lng'] 是附近店铺的距离 算出的是km单位

$this->GetDistance($lat, $lng, $row['lat'], $row['lng']);


define ('M_PI', 3.1415926535898);

function getDistance($lat1, $lng1, $lat2, $lng2, $len_type = 1, $decimal = 2)
{

    $radLat1 = $lat1 * M_PI / 180;

    $radLat2 = $lat2 * M_PI / 180;

    $a = $lat1 * M_PI / 180 - $lat2 * M_PI / 180;

    $b = $lng1 * M_PI / 180 - $lng2 * M_PI / 180;


    $s = 2 * asin(sqrt(pow(sin($a / 2), 2) + cos($radLat1) * cos($radLat2) * pow(sin($b / 2), 2)));

    $s = $s * EARTH_RADIUS;

    $s = round($s * 1000);

    if ($len_type > 1) {

        $s /= 1000;

    }

    return round($s, $decimal);

}

⑤

floor($temp['distance'])/1000;    转换成公里单位

sprintf('%.1f', (float)$juli)、

通过jssdk 获取经纬度 调用百度转换详细位置

<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=spsbwrDkEer15ikuKLG75UfKsHRM8Gse"></script>
function getaddress(latitude,longitude){
    var geoc = new BMap.Geocoder();
    var point = new BMap.Point(longitude,latitude);

    geoc.getLocation(point, function (rs) {
        var addComp = rs.addressComponents;
        console.log(rs.addressComponents)

        $("input[name='address_now']").val(addComp.city)
        placeSearch(addComp.city)
        window.test=addComp.province + "" + addComp.city + "" + addComp.district + "" + addComp.street + "" +  addComp.streetNumber;
    });
    return window.test;
}

标签：商家,addComp,dlng,地理位置,获取,dlat,lat,lng,PI
来源： https://blog.csdn.net/weixin_38725465/article/details/117225177