How to sort a multi-dimensional XML file?

Question

I have tried to get an XML file to sort and have had no luck. After a day and a-half, I need some help from an expert. Thanks.

My XML File (shortened for the example

Answer 1

Okay, sorry for going around the houses before - I've added a different answer for clarity but using the sort proxying technique I linked to.

function xsort(&$nodes, $child_name, $order=SORT_ASC)
{
    $sort_proxy = array();

    foreach ($nodes as $k => $node) {
        $sort_proxy[$k] = (string) $node->$child_name;
    }

    array_multisort($sort_proxy, $order, $nodes);
}

$structure = '

    
        2010-06-01
        Application for Summer Due
    
    
        2010-07-01
        Application for Fall Due
    
    
        2010-07-31
        Summer Bill Due
    
';

$xml = simplexml_load_string($structure);
$nodes = $xml->xpath('/deadlines/deadline');

// Sort by date, descending
xsort($nodes, 'date', SORT_DESC);
var_dump($nodes);