PHP计算地图上两点间的距离

2. class GeoHelper
3. {
4. /**
5. * @param int $lat1
6. * @param int $lon1
7. * @param int $lat2
8. * @param int $lon2
9. * @param string $unit
10. * @return
11. */
12. public static function distance($lat1, $lon1, $lat2, $lon2, $unit = "K")
13. {
14. $theta = $lon1 - $lon2;
15. $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad
16. ($lat2)) * cos(deg2rad($theta));
17. $dist = acos($dist);
18. $dist = rad2deg($dist);
19. $miles = $dist * 60 * 1.1515;
20. $unit = strtoupper($unit);
22. if ($unit == "K") {
23. return ($miles * 1.609344);
24. } else
25. if ($unit == "N") {
26. return ($miles * 0.8684);
27. } else { //mi
28. return $miles;
29. }
30. }
32. /**
33. *
34. * @param string $address
35. * @param string $apikey
36. * @return array [1]:lat [0]:lng
37. */
38. public static function getLatLng($address, $apikey)
39. {
40. $find = array("\\n", "\\r", " ");
41. $replace = array("", "", "+");
42. $address = str_replace($find, $replace, $address);
43. $url = 'http://maps.google.com/maps/geo?q=' . $address . '&key=' . $apikey .
44. '&sensor=false&output=xml&oe=utf8';
45. $response = self::xml2array($url);
46. $coordinates = $response['kml']['Response']['Placemark']['Point']['coordinates'];
47. if (!empty($coordinates)) {
48. $point_array = split(",", $coordinates);
49. return $point_array;
50. }
51. }
52. }

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图上, PHP