29 lines
913 B
PHP
29 lines
913 B
PHP
|
<?php
|
|||
|
|
|
|||
|
|
namespace app\service;
|
|||
|
|
|
|||
|
|
class Location
|
|||
|
|
{
|
|||
|
|
const EARTH_RADIUS = 6378.137;//地球半径 公里
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 计算两组经纬度坐标 之间的距离
|
|||
|
|
* params ：lat1 纬度1； lng1 经度1； lat2 纬度2； lng2 经度2； len_type （1:m or 2:km);
|
|||
|
|
* return m or km
|
|||
|
|
*/
|
|||
|
|
public static function getDistance($lat1, $lng1, $lat2, $lng2, $len_type = 1, $decimal = 2): float
|
|||
|
|
{
|
|||
|
|
$pi = pi();
|
|||
|
|
$radLat1 = $lat1 * $pi / 180.0;
|
|||
|
|
$radLat2 = $lat2 * $pi / 180.0;
|
|||
|
|
$a = $radLat1 - $radLat2;
|
|||
|
|
$b = ($lng1 * $pi / 180.0) - ($lng2 * $pi / 180.0);
|
|||
|
|
$s = 2 * asin(sqrt(pow(sin($a / 2), 2) + cos($radLat1) * cos($radLat2) * pow(sin($b / 2), 2)));
|
|||
|
|
$s = $s * self::EARTH_RADIUS;
|
|||
|
|
$s = round($s * 1000);
|
|||
|
|
if ($len_type > 1) {
|
|||
|
|
$s /= 1000;
|
|||
|
|
}
|
|||
|
|
return round($s, $decimal);
|
|||
|
|
}
|
|||
|
|
}
|