php mysql 根据经纬度计算距离和排序

#1.两点距离(1.4142135623730951)

select st_distance(point(0,0),point(1,1));

select st_distance(point (120.10591, 30.30163),point(120.13026,30.25961)) as distance HAVING distance>0 ORDER BY distance;

mysql 5.6 添加

#2.两点球面距离（157249.0357231545m）

select st_distance_sphere(point(0,0),point(1,1)) as distance HAVING distance>0 ORDER BY distance;

select st_distance_sphere(point (120.10591, 30.30163),point(120.13026,30.25961)) as distance HAVING distance>0 ORDER BY distance;

This function was added in MySQL 5.7.6.

第一个函数是计算平面坐标系下，两点的距离，就是

如果用于计算地球两点的距离，带入的参数是角度（经纬度），则计算的单位也是相差的角度，用此角度计算距离不准。纬度距离约111km每度，经度距离在赤道平面上是111km每度，随纬度的升高逐渐降低为0。

第二个函数是计算球面距离的公式，传入的参数是经纬度（经度-180～180，纬度-90～90），返回的值以m为单位的距离。

ST_Distance_Sphere(g1, g2 [, radius])

如果mysql版本不支持上述函数怎么办？自己实现喽！下面是我自己写的球面距离函数

delimiter //

drop function if exists Spherical_Distance;

create function Spherical_Distance(jin1 double,wei1 double,jin2 double,wei2 double) returns double

NO SQL

BEGIN

  declare j1 double;

  declare w1 double;

  declare j2 double;

  declare w2 double;

  declare R double;

  set j1 = jin1*PI()/;

  set w1 = wei1*PI()/;

  set j2 = jin2*PI()/;

  set w2 = wei2*PI()/;

  set R = ;

  return R*acos(cos(w1)*cos(w2)*cos(j1-j2)+sin(w1)*sin(w2));

END

//

delimiter ;

调用方式

select Spherical_Distance(120.10591,30.30163,120.13026,30.25961);

计算出的值和st_distance_sphere函数计算结果相差不大。

另外的求经纬度距离方法：

  $lat = trim($_POST['lat']);

        $lng = trim($_POST['lng']);

        $distance = "

        ROUND(

        6378.138 *  * ASIN(

            SQRT(

                POW(

                    SIN(

                        (

                            '$lat' * PI() /  - lat * PI() /

                        ) /

                    ),

                ) + COS(40.0497810000 * PI() / ) * COS(lat * PI() / ) * POW(

                    SIN(

                        (

                            '$lng' * PI() /  - lng * PI() /

                        ) /

                    ),

                )

            )

        ) *  )  AS distance ";

        // 内容

        $sql = <<<doc

select id,title as shop_name,create_at,master_title,lng,lat,reg_address,province,city,area,address,start_at,end_at,phone,business_name,business_phone,pics,club_id,{$distance}

from jiazhen_shop_info as jsi

where = order by distance ASC,id desc

doc;    

php mysql 根据经纬度计算距离和排序的相关教程结束。