php XMLReader读取xml文件并解析

$xmlData = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    <url>
        <loc>http://www.awzsr.com/</loc>
        <lastmod>2013-06-13 01:20:01</lastmod>
        <changefreq>always</changefreq>
        <priority>1.0</priority>
    </url>
    <url>
        <loc>http://www.awzsr.com/category/</loc>
        <lastmod>2013-06-13 01:20:01</lastmod>
        <changefreq>always</changefreq>
        <priority>0.8</priority>
    </url>
</urlset>
XML;

$xml = new XMLReader();
// $url = 'http://www.awzsr.com/baidu_sitemap1.xml';
// $xml->open($url);
$xml->XML($xmlData);
$assoc = xml2assoc($xml);
$xml->close();

function xml2assoc($xml) {
    $tree = null;
    while($xml->read())
        switch ($xml->nodeType) {
            case XMLReader::END_ELEMENT: return $tree;
            case XMLReader::ELEMENT:
                $node = array('tag' => $xml->name, 'value' => $xml->isEmptyElement ? '' : xml2assoc($xml));
                if($xml->hasAttributes)
                while($xml->moveToNextAttribute())
                    $node['attributes'][$xml->name] = $xml->value;
                $tree[] = $node;
                break;
            case XMLReader::TEXT:
            case XMLReader::CDATA:
                $tree .= $xml->value;
    }
    return $tree;
}

查看数据：

echo '<pre>';