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function distance($lat1, $lon1, $lat2, $lon2, $unit) { $theta = $lon1 - $lon2; $miles = $dist * 60 * 1.1515; if ($unit == "K") { return ($miles * 1.609344); } else if ($unit == "N") { return ($miles * 0.8684); } else { return $miles; } } //USAGE //Miles echo distance(32.9697, -96.80322, 29.46786, -98.53506, "m") . " miles<br/>"; //Kilometers echo distance(32.9697, -96.80322, 29.46786, -98.53506, "k") . " kilometers<br/>"; //Nautical miles echo distance(32.9697, -96.80322, 29.46786, -98.53506, "n") . " nautical miles<br/>";
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