PHP example to calculate the distance between latitude and longitude coordinates

PHP calculates the distance between two sets of longitude and latitude coordinates

Definition π

define('PI',3.1415926535898);
define('EARTH_RADIUS',6378.137);

Calculation The distance between two sets of longitude and latitude coordinates

/**
* 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);
}

Get the distance between two coordinates

$a =  GetDistance(20.035556,110.33269,20.046521,110.343057);
echo $a;

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