PHP如何计算两个经纬度地理位置之间的距离?

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计算地球表面2点之间的球面距离:
/**
* @param $lat1
* @param $lng1
* @param $lat2
* @param $lng2
* @return int
*/
function getDistance($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;

}
/**
* @param $lat1
* @param $lon1
* @param $lat2
* @param $lon2
* @param float $radius 星球半径
* @return float
*/
function distance($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 getDistance($lat1, $lon1, $lat2, $lon2); // 73.734589823361

echo distance($lat1, $lon1, $lat2, $lon2); // 73.734589823354

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