PHP生成sitemap

createElement("urlset");
$dom->appendChild($root);
for ($i = 0; $i <= 9400; $i++) {
    $track = $dom->createElement("url");
    $root->appendChild($track);
    // 建立track节点下元素
    $loc = $dom->createElement("loc");
    $track->appendChild($loc);
    $lastmod = $dom->createElement("lastmod");
    $track->appendChild($lastmod);
    $changefreq = $dom->createElement("changefreq");
    $track->appendChild($changefreq);
    $priority = $dom->createElement("priority");
    $track->appendChild($priority);
// 赋值
    $text = $dom->createTextNode('http://www.xxxx.com/' . intval($i / 1000) . '_' . ($i+1) . '/');
    $loc->appendChild($text);
    $date = date("Y-m-d", strtotime('-' . rand(0,10) . 'day'));
    $text = $dom->createTextNode($date);
    $lastmod->appendChild($text);
    $text = $dom->createTextNode(daily);
    $changefreq->appendChild($text);
    $text = $dom->createTextNode(0.8);
    $priority->appendChild($text);
}
//生成xml文件
$dom->save("sitemap.xml");
exit;