PHP实例计算经纬坐标间的距离
PHP计算两组经纬度坐标之间的距离
定义π
define('PI',3.1415926535898);
define('EARTH_RADIUS',6378.137);
计算两组经纬度坐标 之间的距离
- /**
- * 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
- */
- function GetDistance($lat1, $lng1, $lat2, $lng2, $len_type = 1, $decimal = 2) {
- $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 * EARTH_RADIUS;
- $s = round($s * 1000);
- if ($len_type > 1)
- {
- $s /= 1000;
- }
- return round($s, $decimal);
- }
获取两个坐标之间的距离
$a = GetDistance(20.035556,110.33269,20.046521,110.343057);
echo $a;