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)
}*/