php计算两个经纬度之间的距离

/**

* @desc 根据两点间的经纬度计算距离

* @param $lat1

* @param $lng1

* @param $lat2

* @param $lng2

* @return float

*/

function getDistance($lat1, $lng1, $lat2, $lng2) {

    $earthRadius = 6367000;

    $lat1 = ($lat1 * pi()) / 180;

    $lng1 = ($lng1 * pi()) / 180;

    $lat2 = ($lat2 * pi()) / 180;

    $lng2 = ($lng2 * pi()) / 180;

    $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);

}