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Distance between two UK postcodes

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A PHP function for calculating the distance between two UK postcodes

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  1. <?php
  2.  
  3. function getDistance($postcode1, $postcode2) {  
  4.  
  5. 	$coordinates1 = file_get_contents('http://maps.googleapis.com/maps/api/geocode/json?address=' . urlencode($postcode1) . '&sensor=true');
  6. 	$coordinates1 = json_decode($coordinates1);
  7.  
  8. 	$coordinates2 = file_get_contents('http://maps.googleapis.com/maps/api/geocode/json?address=' . urlencode($postcode2) . '&sensor=true');
  9. 	$coordinates2 = json_decode($coordinates2);
  10.  
  11.     $earth_radius = 6371;  
  12.  
  13.     $dLat = deg2rad($coordinates2->results[0]->geometry->location->lat - $coordinates1->results[0]->geometry->location->lat);  
  14.     $dLon = deg2rad($coordinates2->results[0]->geometry->location->lng - $coordinates1->results[0]->geometry->location->lng);  
  15.  
  16.     $a = sin($dLat/2) * sin($dLat/2) + cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * sin($dLon/2) * sin($dLon/2);  
  17.     $c = 2 * asin(sqrt($a));  
  18.     $d = $earth_radius * $c;
  19.  
  20. 	$d = $d * 0.621;
  21.  
  22.     return $d;  
  23. } 
  24.  
  25. echo getDistance('W1T 1AL', 'WD6 1JG');
  26.  
  27. ?>

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