// description of your code here
http://www.thinkingphp.org/2007/02/24/cake-12s-set-class-eats-arrays-for-breakfast/

The following code will produce the result:
Array
(
[0] => How-to: Use Html 4.01 in CakePHP 1.2
[1] => Looking up foreign key values using Model::displayField
[2] => Bug-fix update for SVN/FTP Deployment Task
[3] => Access your config files rapidly (Win32 only)
[4] => Making error handling for Model::save more beautiful in CakePHP
[5] => Full content RSS feed
[6] => Visual Sorting - Some Javascript fun I had last night
)

uses('Xml');
 
$feed = xmltoArray(new XML('http://feeds.feedburner.com/thinkingphp'));
$postTitles = Set::extract($feed, 'rss.channel.item.{n}.title'); 

// description of your code here
http://www.thinkingphp.org/2007/02/24/cake-12s-set-class-eats-arrays-for-breakfast/

PHP:

function xmltoArray($node)
{
    $array = array();
    
    foreach ($node->children as $child)
    {
        if (empty($child->children))
        {
            $value = $child->value;
        }
        else
        {
            $value = xmltoArray($child);
        }
        
        $key = $child->name;
        
        if (!isset($array[$key]))
        {
            $array[$key] = $value;
        }
        else 
        {
            if (!is_array($array[$key]) || !isset($array[$key][0]))
            {
                $array[$key] = array($array[$key]);
            }
            
            $array[$key][] = $value;
        }
    }
    
    return $array;
}