计算两点之间距离、计算两个坐标距离PHP

   /**
     * 根据两点间的经纬度计算距离
     * @param $lat1 | 纬度1坐标
     * @param $lng1 | 经度1坐标
     * @param $lat2 | 纬度2坐标
     * @param $lng2 | 经度2坐标
     * @return false|float
     */
    public function getDistanceByTwoPoint($lat1, $lng1, $lat2, $lng2)
    {
        $earthRadius = 6367000; //approximate radius of earth in meters
        /*
        Convert these degrees to radians
        to work with the formula
        */
        $lat1 = ($lat1 * pi() ) / 180;
        $lng1 = ($lng1 * pi() ) / 180;

        $lat2 = ($lat2 * pi() ) / 180;
        $lng2 = ($lng2 * pi() ) / 180;
        /*
        Using the
        Haversine formula
        http://en.wikipedia.org/wiki/Haversine_formula
        calculate the distance
        */
        $calcLongitude = $lng2 - $lng1;
        $calcLatitude = $lat2 - $lat1;
        $stepOne = pow(sin($calcLatitude / 2), 2) + cos($lat1) * cos($lat2) * pow(sin($calcLongitude / 2), 2);
        $stepTwo = 2 * asin(min(1, sqrt($stepOne)));
        $calculatedDistance = $earthRadius * $stepTwo;

        return round($calculatedDistance);
    }