百度地图两点间的距离计算php版

[PHP]代码

//Business_Latitude_new,Business_Longitude_new是当前坐标
//$latitude,$longitude是目标坐标
distance=6371.012 *
       acos(cos(acos(-1) / 180 * Business_Latitude_new) *
            cos(acos(-1) / 180 * $latitude) *
            cos(acos(-1) / 180 * Business_Longitude_new - acos(-1) / 180 * $longitude) +
            sin(acos(-1) / 180 * Business_Latitude_new) *
            sin(acos(-1) / 180 * $latitude))*1