*zip code distance calculator

function haversine($lat1, $long1, $lat2, $long2, $earth){
   //Point 1 cords
   $lat1 = deg2rad($lat1);
   $long1= deg2rad($long1);
   //Point 2 cords
   $lat2 = deg2rad($lat2);
   $long2= deg2rad($long2);
   //Haversine Formula
   $dlong=$long2-$long1;
   $dlat=$lat2-$lat1;
   $sinlat=sin($dlat/2);
   $sinlong=sin($dlong/2);
   $a=($sinlat*$sinlat)+cos($lat1)*cos($lat2)*($sinlong*$sinlong);
   $c=2*asin(min(1,sqrt($a)));
   $d=round($earth*$c);
   return $d;
}
function getMiles($lat1, $long1, $lat2, $long2){
   return haversine($lat1, $long1, $lat2, $long2, 3960);
}
function getKilometers($lat1, $long1, $lat2, $long2){
   return haversine($lat1, $long1, $lat2, $long2, 6371);
}