# php mysql lat long query

I would like to search for records within a given distance like 10km.  i have a table called users with username, userid, lat and lon as fields.

I would like to return all the users within 10km from say user number 15 and then order the records from nearest to farthest.  I would like to do this in the most economic way possible so I believe that means doing all the calculations within the mysql query.

does anyone know how to accomplish this this?
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Commented:
Here is a PHP method to calculate distance based on latitude and longitude. There may be a MySQL way to do this, but I'm not sure:

Takes two sets of coordinates in decimal longitude and latitude format and returns the distance in kilometers.
<?php

\$lat1 = 46.2341938036161;
\$lon1 = -63.124778021257015;

\$lat2 = 46.4141938036161;
\$lon2 = -63.118571124705284;

\$distance = (3958*3.1415926*sqrt((\$lat2-\$lat1)*(\$lat2-\$lat1) + cos(\$lat2/57.29578)*cos(\$lat1/57.29578)*(\$lon2-\$lon1)*(\$lon2-\$lon1))/180);

print(\$distance);

?>
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Author Commented:
Thats not what I'm looking for.  already know the distance in kilometers I need an mysql query to return all users within that distance.
0
Author Commented:
I found a tutorial here that solved my problem:

http://www.phparch.com/sample.php?disc_show=316&mid=9
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