简单计算给定两个给定经纬度坐标的距离

function get_two_point_distance($lat1,$lat2,$lng1,$lng2)
    {
        $radLat1 = deg2rad($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($b / 2), 2))) * 6378.137;
        return round($s,2);//返回公里数
    }

    echo get_two_point_distance('30.57455367949652','30.570165917503918','104.20095642799379','104.19042607540132');

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