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Calculate distance between 2 points

This is a snippet for calculating the distance between 2 points. Each "point" is represented by the longitude & latitude for that location

Submitted By: PsychoCoder
Actions:
Rating:
Views: 211

Language: PHP
Last Modified: May 14, 2008
Instructions: Pass the function the longitude/latitude for each location and a type (M for miles, K for kilometers)

Snippet


  1. function CalculateDistance($lat1, $lon1, $lat2, $lon2, $distanceType)
  2. {
  3.  
  4.   $theta = $lon1 - $lon2;
  5.   $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
  6.   $dist = acos($dist);
  7.   $dist = rad2deg($dist);
  8.   $miles = $dist * 60 * 1.1515;
  9.   $distanceType = strtoupper($distanceType);
  10.  
  11.   if ($distanceType == "K")
  12.   {
  13.     //return distance in kilometers
  14.     return ($miles * 1.609344);
  15.   }
  16.      else
  17.      {
  18.           //return distance in miles
  19.           return $miles;
  20.      }
  21. }

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