View: Distance between two points (given the latitude/longitude of those points) in PHP

1. Distance between two points (given the latitude/longitude of those points) in PHP
   1 year ago by spirit
   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.  
   19. echo distance(32.9697, -96.80322, 29.46786, -98.53506, "m") . " miles<br>";
   20. echo distance(32.9697, -96.80322, 29.46786, -98.53506, "k") . " kilometers<br>";
   21. echo distance(32.9697, -96.80322, 29.46786, -98.53506, "n") . " nautical miles<br>";
   distancelatlatitudelnglongitudemapsphp
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