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/**
* 第一种方法
* @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);
}
/**
* 第二种方法
* @param $lat1
* @param $lng1
* @param $lat2
* @param $lng2
* @return int
*/
function getDistance2($lat1, $lng1, $lat2, $lng2){
// 将角度转为狐度
$radLat1 = deg2rad($lat1);// deg2rad()函数将角度转换为弧度
$radLat2 = deg2rad($lat2);
$radLng1 = deg2rad($lng1);
$radLng2 = deg2rad($lng2);
$a = $radLat1 - $radLat2;
$b = $radLng1 - $radLng2;
$s = 2 * asin(sqrt(pow(sin($a / 2), 2)+cos($radLat1) * cos($radLat2) * pow(sin($b / 2), 2))) * 6378.137;
return $s;
}
/**
* 第三种方法
* @param $lat1
* @param $lon1
* @param $lat2
* @param $lon2
* @param float $radius 星球半径 KM
* @return float
*/
function distance($lat1, $lon1, $lat2,$lon2,$radius = 6378.137)
{
$rad = floatval(M_PI / 180.0);
$lat1 = floatval($lat1) * $rad;
$lon1 = floatval($lon1) * $rad;
$lat2 = floatval($lat2) * $rad;
$lon2 = floatval($lon2) * $rad;
$theta = $lon2 - $lon1;
$dist = acos(sin($lat1) * sin($lat2) + cos($lat1) * cos($lat2) * cos($theta));
if ($dist < 0 ) {
$dist += M_PI;
}
return $dist = $dist * $radius;
}
$lat1 = '31.253411';
$lon1 = '121.518998';
$lat2 = '31.277117';
$lon2 = '120.744587';
echo getDistance2($lat1, $lon1, $lat2, $lon2); // 73.734589823361
echo distance($lat1, $lon1, $lat2, $lon2); // 73.734589823354