php生成xml文件

<?phpfunction stripSpecial($str){$str = iconv('', 'utf-8', $str);$str = htmlspecialchars($str);//$str = '<![CDATA[' . $str . ']]>';return $str;}function setXmldata($loc, $lastmod, $changefreq, $priority){$loc = stripSpecial($loc);$lastmod = stripSpecial($lastmod);$changefreq = stripSpecial($changefreq);$priority = stripSpecial($priority);$arr_url = array('loc'=>$loc,'lastmod'=>$lastmod,'changefreq'=>$changefreq,'priority'=>$priority);return $arr_url;}$doc = new DOMDocument();$doc->formatOutput = true; $r = $doc->createElement('root');$doc->appendChild($r);$date = date(c,time());$xml_data = array();define(URL,'http://test.com');$xml_data[] = setXmldata(URL, $date, 'always', '1.0');$xml_data[] = setXmldata(URL."content/page1", $date, 'daily', '0.8');$xml_data[] = setXmldata(URL."content/page2", $date, 'daily', '0.8');$xml_data[] = setXmldata(URL."main/search?search_type=1", $date, 'daily', '0.8');$xml_data[] = setXmldata(URL."main/search?search_type=2", $date, 'daily', '0.8');$xml_data[] = setXmldata(URL."main/search?search_type=3", $date, 'daily', '0.8');$xml_data[] = setXmldata(URL."main/search?search_type=4", $date, 'daily', '0.8');$xml_data[] = setXmldata(URL."main/search?search_type=5", $date, 'daily', '0.8');$users = array(array('id'=>1,'username'=>'test1'),array('id'=>2,'username'=>'test2'),array('id'=>3,'username'=>'test3'));foreach ($users as $u){$xml_data[] = setXmldata(URL."user/profile/".$u['username'], $date, 'daily', '0.8');}$urlset = $doc->createElement('urlset');$doc->appendChild($urlset);foreach( $xml_data as $xdata ){$url = $doc->createElement('url');$loc = $doc->createElement("loc");$loc->appendChild($doc->createTextNode($xdata['loc']));$url->appendChild($loc);$lastmod = $doc->createElement("lastmod");$lastmod->appendChild($doc->createTextNode($xdata['lastmod']));$url->appendChild($lastmod);$changefreq = $doc->createElement("changefreq");$changefreq->appendChild($doc->createTextNode($xdata['changefreq']));$url->appendChild($changefreq);$priority = $doc->createElement("priority");$priority->appendChild($doc->createTextNode($xdata['priority']));$url->appendChild($priority);$urlset->appendChild($url);}$r->appendChild($urlset);//echo $doc->saveXML();$doc->save("sitemap.xml");?>