PHP根据两点间的经纬度计算距离

这是一个不错的示例，直接贴代码，首先要知道纬度值、经度值

/
Convert these degrees to radians
to work with the formula
/

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

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

/*
Using the
Haversine formula

http://en.wikipedia.org/wiki/Haversine_formula

calculate the distance
*/

$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);
}