*}
codea teams

Distance Calculations



Calculate the distance between two points using latitude and longitude.

<?php
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; 
      } 
} 

echo distance(32.9697, -96.80322, 29.46786, -98.53506, "M") . " Miles<br>"; 
echo distance(32.9697, -96.80322, 29.46786, -98.53506, "K") . " Kilometers<br>"; 
echo distance(32.9697, -96.80322, 29.46786, -98.53506, "N") . " Nautical Miles<br>"; 

?>