PHP/distance_calculator at master · LasVegasCoder/PHP · GitHub

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<?php


function distance($latitude1, $longitude1, $latitude2, $longitude2, $type="m") {

  $theta = $longitude1 - $longitude2;

  $dist = (sin(deg2rad($latitude1))
		* sin(deg2rad($latitude2))
		+  cos(deg2rad($latitude1))
		* cos(deg2rad($latitude2))
		* cos(deg2rad($theta)));

  $dist = acos($dist);
  $dist = rad2deg($dist);
  $miles = $dist * 60 * 1.1515;
  $type = strtolower($type);

   switch($type)
   {
		case "k" :
		$mileage = ($miles * 1.609344) . ' Kilometer';
		break;

		case "n" :
		$mileage = ($miles * 0.8684) . ' Nautical Miles';
		break;

		case "m" :
		$mileage = ($miles) . ' Miles';
		break;
   }

   return $mileage;
}


echo distance(51.2296756,112.01221287, 23.4063974,17.82510681, 'm') . "\n";
echo distance(51.2296756,112.01221287, 23.4063974,17.82510681, 'K') . "\n";
echo distance(51.2296756,112.01221287, 23.4063974,17.82510681, 'n'). "\n";
?>