SimpleXML vs XMLWriter vs DOM

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<?php

function printMemory()
{
    echo "Used " . (memory_get_peak_usage() / 1024 / 1024) . " MB\n";
}

function simpleXMLTest($nodes, $subnodes)
{
    $xml = new SimpleXMLElement("<?xml version=\"1.0\" encoding=\"utf-8\" ?><resultset/>");
    for ($i=0; $i<$nodes; $i++) {
        $node = $xml->addChild('feed' . $i);
        for ($j=0; $j<$subnodes; $j++) {
            $subnode = $node->addChild('feed' . $j);
            $subnode->addAttribute('feed', $j);
        }
    }
    printMemory();
    file_put_contents('/tmp/_test.xml', $xml->asXML());
}

function XMLWriterTest($nodes, $subnodes)
{
    $xml = new XMLWriter();
    $xml->openMemory();
    $xml->startDocument('1.0', 'UTF-8');
    $xml->startElement('resultset');
    for ($i=0; $i<$nodes; $i++) {
        $xml->startElement('test' . $i);
        for ($j=0; $j<$subnodes; $j++) {
            $xml->startElement('test' . $j);
            $xml->writeAttribute('test', $j);
            $xml->endElement();
        }
        $xml->endElement();
    }
    $xml->endElement();
    printMemory();
    file_put_contents('/tmp/_test.xml', $xml->outputMemory(true));
}

function DOMTest($nodes, $subnodes)
{
    $dom = new DOMDocument('1.0', 'utf-8');
    $resultset = $dom->createElement('resultset');
    for ($i=0; $i<$nodes; $i++) {
        $node = $dom->createElement('test' . $i);
        for ($j=0; $j<$subnodes; $j++) {
            $subnode = $dom->createElement('test' . $j);
            $subnode->setAttribute('test', $j);
            $node->appendChild($subnode);
        }
        $resultset->appendChild($node);
    }
    $dom->appendChild($resultset);
    printMemory();
    file_put_contents('/tmp/_test.xml', $dom->saveXML());
}

$nodes = 1000;
$subnodes = 100;

$start = microtime(true);

//simpleXMLTest($nodes, $subnodes);
//XMLWriterTest($nodes, $subnodes);
//DOMTest($nodes, $subnodes);

$end = microtime(true) - $start;
echo "Took " . $end . " ms\n";