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
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/**
* @desc 根据两点间的经纬度计算距离
* @param float $lat 纬度值
* @param float $lng 经度值
*/
function getDistance($lat1,$lng1,$lat2,$lng2)
{
$earthRadius = 6367000; //approximate radius of earth in meters
/
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);
}