Distancia entre dos puntos (dados por longitud y latitud)

[chefnelone]

aqui encontre justo lo que estaba buscando y listo en php para usarlo modificandolo un poco

The above formula as a function:
< ?php

function getDistance($lat1, $long1, $lat2, $long2)
{
//$earth = 6371; //km change accordingly
$earth = 3960; //miles

//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($lat2)*($sinlo ng*$sinlong);

$c=2*asin(min(1,sqrt($a)));

$d=round($earth*$c);

return $d;
}

// pull cords out of database

echo "Distance in miles from CB2 to SS4: ".getDistance(52.163, 0.133, 51.594, 0.715);
?>