Posted By

ichnoweb on 04/06/11


Tagged

distance


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Calculate distances


 / Published in: PHP
 

URL: http://www.catswhocode.com/blog/10-super-useful-php-snippets

"Here is a very handy function, which calculate the distance from a point A to a point B, using latitudes and longitudes. The function can return the distance in miles, kilometers, or nautical miles."

  1. function distance($lat1, $lon1, $lat2, $lon2, $unit) {
  2.  
  3. $theta = $lon1 - $lon2;
  4. $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
  5. $dist = acos($dist);
  6. $dist = rad2deg($dist);
  7. $miles = $dist * 60 * 1.1515;
  8. $unit = strtoupper($unit);
  9.  
  10. if ($unit == "K") {
  11. return ($miles * 1.609344);
  12. } else if ($unit == "N") {
  13. return ($miles * 0.8684);
  14. } else {
  15. return $miles;
  16. }
  17. }
  18. // Usage
  19. echo distance(32.9697, -96.80322, 29.46786, -98.53506, "k")." kilometers";

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