U pravu si jablane, ide od -1 do 1
PHP kôd:
function grad_radius($grad, $radius = "10"){
$sql = mysql_query("
SELECT g1 . *
FROM gradovi AS g1
INNER JOIN gradovi AS g2 ON POW( (
g1.lat - g2.lat
), 2 ) + POW( (
g1.lon - g2.lon
), 2 ) < POW( ( $radius / 111.12 ) , 2 )
WHERE g2.grad = '$grad'");
return mysql_fetch_assoc($sql);
}