looping through returned search results

Hi,

I am pretty new to PHP and am having a bit of difficulty looping through and displaying results from a search.  Here is my code, taken from snippets of the sample code.

I get invalid argument in the foreach statement return in the PHP error log.  any help and assistance would be greatly appreciated.

<?php

require_once 'PHPtoolkit.php';
require_once 'login_info.php';

global $myNSclient;

$expensesearch = new nsComplexObject("ExpenseCategorySearch");

//$contactSearch->setFields(array("firstName" => array( "operator" => "contains",
// "searchValue" => "t")));

$expensesearch->setFields(array());

// Set search preferences
$myNSclient->setSearchPreferences(false, 10);

// Invoke search operation
$searchResponse = $myNSclient->search($expensesearch);