# Distance calculator between 2 points

**URL:** <https://forum.kirupa.com/t/distance-calculator-between-2-points/326786>\
**Category:** programming\
**Created:** [January 12, 2012, 8:25am UTC](https://forum.kirupa.com/t/distance-calculator-between-2-points/326786 "2012-01-12T08:25:12Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![etra](https://avatars.discourse-cdn.com/v4/letter/e/73ab20/32.png) [@etra](https://forum.kirupa.com/u/etra)\
**Post date:** [January 12, 2012, 8:25am UTC](https://forum.kirupa.com/t/distance-calculator-between-2-points/326786/1 "2012-01-12T08:25:12Z")

</div>

Somewhere in internet i found this function maybe some of u it will be usefull 🙂

```php
<?php

/*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
/*:: :*/
/*:: this routine calculates the distance between two points (given the :*/
/*:: latitude/longitude of those points). it is being used to calculate :*/
/*:: the distance between two zip codes or postal codes using our :*/
/*:: zipcodeworld(tm) and postalcodeworld(tm) products. :*/
/*:: :*/
/*:: definitions: :*/
/*:: south latitudes are negative, east longitudes are positive :*/
/*:: :*/
/*:: passed to function: :*/
/*:: lat1, lon1 = latitude and longitude of point 1 (in decimal degrees) :*/
/*:: lat2, lon2 = latitude and longitude of point 2 (in decimal degrees) :*/
/*:: unit = the unit you desire for results :*/
/*:: where: 'm' is statute miles :*/
/*:: 'k' is kilometers (default) :*/
/*:: 'n' is nautical miles :*/
/*:: united states zip code/ canadian postal code databases with latitude & :*/
/*:: longitude are available at http://www.zipcodeworld.com :*/
/*:: :*/
/*:: For enquiries, please contact sales@zipcodeworld.com :*/
/*:: :*/
/*:: official web site: http://www.zipcodeworld.com :*/
/*:: :*/
/*:: hexa software development center © all rights reserved 2004 :*/
/*:: :*/
/*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
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>";

?>

```