// Function takes latitude and longitude of two places as input
// and prints the distance in miles and kms.
function calculateDistance($lat1, $lon1, $lat2, $lon2)
// Convert all the degrees to radians
$lat1 = deg2rad($lat1);
$lon1 = deg2rad($lon1);
$lat2 = deg2rad($lat2);
$lon2 = deg2rad($lon2);
// Find the deltas
$delta_lat = $lat2 - $lat1;
$delta_lon = $lon2 - $lon1;
// Find the Great Circle distance
$temp = pow(sin($delta_lat / 2.0), 2) + cos($lat1) * cos($lat2) *
pow(sin($delta_lon / 2.0), 2);
$EARTH_RADIUS = 3956;
$distance = ($EARTH_RADIUS * 2 * atan2(sqrt($temp), sqrt(1 - $temp)) *
1.6093);
return $distance;
}
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----- Original Message -----
From: "vernon" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, November 18, 2002 3:21 PM
Subject: [PHP] Distance Based on Zip Code
> Does anyone know how I can set something up that tells the distance
between
> one Zip Code and another? I'm needing to be able to set something up where
> one user's record is compared to another and a distance is measured. Any
> have any ideas?
>
>
>
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