Calculate distances in PHP

in PHP

Here is a code snippet which allows you to calculate the distance between longitude and latitudes in either miles, kilometres or nautical miles.


function distance($lat1, $lon1, $lat2, $lon2, $unit) { 

$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) 
       * cos(deg2rad($lat2)) * cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$miles = $dist * 60 * 1.1515;
$unit = strtoupper($unit);
 
      if ($unit == "K") {
          return ($miles * 1.609344);
      } else if ($unit == "N") {
          return ($miles * 0.8684);
      } else {
          return $miles;
     }
}

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