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计算地图上两点间的距离

时间：2021-07-01 10:21:17 帮助过：19人阅读

<无详细内容>
  1. class GeoHelper
  2. {
  3. /**
  4. * @param int $lat1
  5. * @param int $lon1
  6. * @param int $lat2
  7. * @param int $lon2
  8. * @param string $unit
  9. * @return
  10. */
  11. public static function distance($lat1, $lon1, $lat2, $lon2, $unit = "K")
  12. {
  13. $theta = $lon1 - $lon2;
  14. $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad
  15. ($lat2)) * cos(deg2rad($theta));
  16. $dist = acos($dist);
  17. $dist = rad2deg($dist);
  18. $miles = $dist * 60 * 1.1515;
  19. $unit = strtoupper($unit);
  21. if ($unit == "K") {
  22. return ($miles * 1.609344);
  23. } else
  24. if ($unit == "N") {
  25. return ($miles * 0.8684);
  26. } else { //mi
  27. return $miles;
  28. }
  29. }
  31. /**
  32. *
  33. * @param string $address
  34. * @param string $apikey
  35. * @return array [1]:lat [0]:lng
  36. */
  37. public static function getLatLng($address, $apikey)
  38. {
  39. $find = array("\n", "\r", " ");
  40. $replace = array("", "", "+");
  41. $address = str_replace($find, $replace, $address);
  42. $url = 'http://maps.google.com/maps/geo?q=' . $address . '&key=' . $apikey .
  43. '&sensor=false&output=xml&oe=utf8';
  44. $response = self::xml2array($url);
  45. $coordinates = $response['kml']['Response']['Placemark']['Point']['coordinates'];
  46. if (!empty($coordinates)) {
  47. $point_array = split(",", $coordinates);
  48. return $point_array;
  49. }
  50. }
  51. }

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