PEAR::DB_Pager: a very strange USAGE!!!!

HI,

this is the usage code suggested by the author of PEAR::DB_Pager.

<?php
require_once 'DB/Pager.php';
$db = DB::connect('mysql://root@:localhost/global');
$from = 0; // The row to start to fetch from (you might want to get
this param from the $_GET array
$limit = 3; // The number of results per page
$maxpages = 10; // The number of pages for displaying in the pager
(optional)
$sql = "select * from item";
$res = $db->limitQuery($sql, $from, $limit);
$nrows = 0; // Alternative you could use $res->numRows()
while ($row = $res->fetchrow()) {
// XXX code for building the page here
$nrows++;
}
$data = DB_Pager::getData($from, $limit, $nrows, $maxpages);
echo $nrows . '<br>';
// XXX code for building the pager here
?>

I found it strange, because this code always shows one page, beacuse of
the $nrows param in the getData call.

If I change the line

$data = DB_Pager::getData($from, $limit, $nrows, $maxpages);

into

$data = DB_Pager::getData($from, $limit, 12, $maxpages);

It works correctly (12 is the number of rows in the item table), it
gives me the right statistics for the next and previous pages, etc....

Maybe there is something I don't' understand, but with the suggested
usage, the pager is useless!!

Thanks for any hint.

:)ario