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Calculate distances

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"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."

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  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";

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

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