No results for php/postgresql query

When I execute the following code, I get a blank page. However, if I remove the complete for-loop, and only display the number of rows (pg_num_rows($result)), I do get the correct value back. I don't see what I'm doing wrong here.

System: Windows Vista, PG8.3, PHP 5.2.9

<?php
$query = "select name from person;";
$result = pg_query($db, $query);
if ($result)
{
	$rows = pg_num_rows($result);
	echo("result: ". $rows);
	// start problem code
	for ($row = 0; $row < $rows; $row++)
	{
		$values = pg_fetch_row($result, $row);
		echo 'Person: ' . implode(' ', $values) . " <br/>\n";
	}
	else
	{
		echo ("Query error: " . pg_last_error($db) );
	} 
	// end problem code
}
?>

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