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joshholat / gist:6980569
Last active Dec 25, 2015
Calculating Distance Between Two Latitude and Longitude Points
View gist:6980569
function distance($lat1, $lon1, $lat2, $lon2, $unit)
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$miles = $dist * 60 * 1.1515;
$unit = strtoupper($unit);
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