根据两点的经纬度计算距离

function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
    $theta = $longitude1 - $longitude2;
    $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
    $miles = acos($miles);
    $miles = rad2deg($miles);
    $miles = $miles * 60 * 1.1515;
    $feet = $miles * 5280;
    $yards = $feet / 3;
    $kilometers = $miles * 1.609344;
    $meters = $kilometers * 1000;
    return compact('miles','feet','yards','kilometers','meters');
}


$point1 = array('lat' => 40.770623, 'long' => -73.964367);
$point2 = array('lat' => 40.758224, 'long' => -73.917404);
$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
var_dump($distance);


function rad($d)
{
       return $d * 3.1415926535898 / 180.0;
}
function GetDistance($lat1, $lng1, $lat2, $lng2)
{
    $EARTH_RADIUS = 6378.137;
    $radLat1 = rad($lat1);
    //echo $radLat1;
   $radLat2 = rad($lat2);
   $a = $radLat1 - $radLat2;
   $b = rad($lng1) - rad($lng2);
   $s = 2 * asin(sqrt(pow(sin($a/2),2) +
    cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)));
   $s = $s *$EARTH_RADIUS;
   $s = round($s * 10000) / 10000;
   return $s;
}

var_dump(GetDistance($point1['lat'], $point1['long'], $point2['lat'], $point2['long']));

/*
array(5) {
  ["miles"]=>
  float(2.6025445138617)
  ["feet"]=>
  float(13741.43503319)
  ["yards"]=>
  float(4580.4783443965)
  ["kilometers"]=>
  float(4.1883893981162)
  ["meters"]=>
  float(4188.3893981162)
}*/