php生成xml实例与基础知识

header("Content-Type:application/xml;charset=utf-8");
header("Cache-Control: no-cache,must-revalidate");
header("Expries: Fri, 14 Mar 1980 20:00:00 GMT");
header("Last-Modified: ".date('r'));
header("Prama: no-cache");
$xml='
';
$sxe=new SimpleXMLElement($xml);
if(method_exists($sxe,'addChild')){
    $sxe->addAttribute('version','2.0');
    $channel=$sxe->addChild('channel');
    $channel->addChild("title","服饰批发");
    for($i=0;$i<5;$i++){
        $item=$channel->addChild('item');
        $item->addChild('title','商品'.$i);
        $item->addChild('link',$i);
    }
    echo $sxe->asXML();
}else{
    $dom=new DOMDocument("1.0");//生成一个新的DOM对象
    $rss=$dom->createElement("rss");//生成rss元素
    $rss->setAttribute("version","2.0");
    $rss=$dom->appendChild($rss);
 
    $channel=$dom->createElement("channel");
    $channel=$rss->appendChild($channel);
 
    $title=$dom->createElement('title');
    $text=$dom->createTextNode("服饰批发");
    $title->appendChild($text);
    $title=$channel->appendChild($title);
 
    for($i=0;$i<5;$i++){
        $item=$dom->createElement("item");
        $item=$channel->appendChild($item);
 
        $title=$dom->createElement("title");
        $text=$dom->createTextNode("商品".$i);
        $title->appendChild($text);
        $title=$item->appendChild($title);
 
        $link=$dom->createElement("link");
        $text=$dom->createTextNode("$i");
        $link->appendChild($text);
        $link=$item->appendChild($link);
    }
    echo $dom->saveXML();
    //$dom->save("nnn.xml");
}
?>