Geo-location is becoming more and more popular as time passes and technology supports it better more so as there is plenty of free resources to help you get the data you need to be more GEO centric with your users. However sometimes you want to give a range from point A to point B and this is one way you can do it.\r\n\r\nYou can do the calculation in this function to return Miles (default), Nautical Miles, or Kilometers just enter the longitude/latitude of point A and do the same for point B and your good to go.\r\n\r\n
\r\nfunction distance($lat1, $lon1, $lat2, $lon2, $unit) { \r\n	$theta = $lon1 - $lon2; \r\n	$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta)); \r\n	$dist = acos($dist); \r\n	$dist = rad2deg($dist); \r\n	$miles = $dist * 60 * 1.1515;\r\n	$unit = strtoupper($unit);\r\n\r\n	if($unit == "K")\r\n	{\r\n		return ($miles * 1.609344); \r\n	}\r\n	elseif($unit == "N") {\r\n		return ($miles * 0.8684);\r\n	}\r\n	else\r\n	{\r\n		return $miles;\r\n	}\r\n}\r\necho distance(32.9697, -96.80322, 29.46786, -98.53506, "m") . " miles
";\r\necho distance(32.9697, -96.80322, 29.46786, -98.53506, "k") . " kilometers
";\r\necho distance(32.9697, -96.80322, 29.46786, -98.53506, "n") . " nautical miles
";\r\n