根据两点间的经纬度计算距离

/** 
* @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; 
　　$lat1 = ($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); 
}

$distance = getDistance(108.95,34.27,108.70,34.33)/1000;

echo $distance."KM";