【转】那我们是如何计算出客户地址多少米范围内有哪些门店呢

最近公司需要通过客户的收货地址查询离客户地址最近有哪些门店,客户可以去最近的门店取货.

那我们是如何计算出客户地址1000米内有哪些门店呢?我们可以通过下面几部计算出来.

1.获取客户地址的经纬度,我们可以通过百度地图提供的接口获取.($address为客户地址)

//百度接口获取经纬度
public function getlat($address) {
    $url = 'http://api.map.baidu.com/geocoder/v2/?city=上海&address=' . $address . '&output=json&ak=' . $this->ak;

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_NOSIGNAL, 1);
    $data = curl_exec($ch);
    curl_close($ch);
    $data = json_decode($data, true);
    $ret['lat'] = $data['result']['location']['lat'];
    $ret['lng'] = $data['result']['location']['lng'];
    echo json_encode($ret);
}

2.如果是1000米内的店,我们需要计算出1000米内的经纬度范围.

/*
 * 计算经纬度范围
 * $lat 纬度
 * $lon 经度
 * $raidus 半径(米)
 */

function getAround($lat, $lon, $raidus) {
    $PI = 3.14159265;
    $EARTH_RADIUS = 6378137;
    $RAD = $PI / 180.0;

    $latitude = $lat;
    $longitude = $lon;
    $degree = (24901 * 1609) / 360.0;
    $raidusMile = $raidus;
    $dpmLat = 1 / $degree;
    $data = array();
    $radiusLat = $dpmLat * $raidusMile;
    $minLat = $latitude - $radiusLat;
    $maxLat = $latitude + $radiusLat;
    $data["maxLat"] = $maxLat;
    $data["minLat"] = $minLat;
    $mpdLng = $degree * cos($latitude * ($PI / 180));
    $dpmLng = 1 / $mpdLng;
    $radiusLng = $dpmLng * $raidusMile;
    $minLng = $longitude - $radiusLng;
    $maxLng = $longitude + $radiusLng;
    $data["maxLng"] = $maxLng;
    $data["minLng"] = $minLng;
    //print_r($data);
    return $data;
}

3.我们知道数据库内每一家店都储存了这家店的经纬度信息,现在我们可以通过上面计算出的经纬度范围来查询出1000米内有哪些门店了.

//计算出半径范围内的店
public function getdz($lat, $lng) {
    include_once('my_db.php');
    $this->qu = new MY_DB_ALL("QUICK");
    //$ret = json_decode($this->getlat($address), true);
    //print_r($ret);exit;
    $data = $this->getAround($lat, $lng, 2000);
    //print_r($data);
    $sql = "select * from shop where baidu_lat between '" . $data['minLat'] . "' and '" . $data['maxLat'] . "' and baidu_lng between '" . $data['minLng'] . "' and '" . $data['maxLng'] . "' and status=1 and ztd_flag=2";
    $rett = $this->qu->rquery($sql);
    for ($i=0;$i<count($rett);$i++) {
        $array[$i]["shop_id"] = $rett[$i]["shop_id"];
        $array[$i]["shop_name"] = iconv("gbk","utf-8",$rett[$i]["shop_name"]);
        $array[$i]["shop_address"] = iconv("gbk","utf-8",$rett[$i]["shop_address"]);
        $array[$i]["shop_date"] = $rett[$i]["shop_date"];
        $array[$i]['shop_phone'] = $rett[$i]["shop_phone"];
        $array[$i]['area'] = $rett[$i]["area"];
    }
    //echo "<pre>";print_r($array);exit;
    echo json_encode($array);
}

上面的代码需要根据自己实际情况来编写哦.大家主要看$sql这个sql语句就行了.嘿嘿

4.如果想计算出离客户址最近的一家店是哪家,我需要一个计算距离的方法,如下:

/**
 *  @desc 根据两点间的经纬度计算距离
 *  @param float $lat 纬度值
 *  @param float $lng 经度值
 */
public function getDistance($lat1, $lng1, $lat2, $lng2) {
    $earthRadius = 6367000; //地球半径

    $lat1 = ($lat1 * pi() ) / 180;
    $lng1 = ($lng1 * pi() ) / 180;

    $lat2 = ($lat2 * pi() ) / 180;
    $lng2 = ($lng2 * pi() ) / 180;

    $calcLongitude = $lng2 - $lng1;
    $calcLatitude = $lat2 - $lat1;
    $stepOne = pow(sin($calcLatitude / 2), 2) + cos($lat1) * cos($lat2) * pow(sin($calcLongitude / 2), 2);
    $stepTwo = 2 * asin(min(1, sqrt($stepOne)));
    $calculatedDistance = $earthRadius * $stepTwo;

    return round($calculatedDistance);
}

5.最后我们通过计算比较1000米内那几家店最少距离就可以知道最近是哪个店了.

//计算出最近的一家店
public function zjd($address) {
    $ret = $this->getdz($address);
    $jwd = $this->getlat($address);
    if ($ret) {
        $arr = array();
        foreach ($ret as $k => $v) {
            $arr[$k] = $this->getDistance($jwd['lat'], $jwd['lng'], $v['baidu_lat'], $v['baidu_lng']);
        }
        asort($arr);
        //print_r($arr);
        foreach ($arr as $k1 => $v1) {
            $data[] = $ret[$k1];
        }
        print_r($data);
    } else {
        echo '无最近的门店';
    }
}