php 操作xml文件

读取xml:

$doc=new DOMDocument();
 $doc->load('news.xml');
 $news=$doc->getElementsByTagName("news");

 for($i=0;$i<$news->length;$i++){
        $item=$news->item($i);
 }

修改xml :

    $doc=new DOMDocument();
    $doc->load('news.xml');
    $xinwen=$doc->documentElement;

   $id=1;
   $newsinfo=$doc->getElementsByTagName("news");
   if($newsinfo->length>0){
        $item=$newsinfo->item($newsinfo->length-1);
        $id=intval($item->getElementsByTagName("news_id")->item(0)->nodeValue)+1;

   }

   $news= $doc->createElement('news');
   $xinwen->appendChild($news);

   $newsid=$doc->createElement('news_id');
   $news->appendChild($newsid);
   $newid_val=$doc->createTextNode($id);
   $newsid->appendChild($newid_val);

   $newtitle=$doc->createElement('news_title');
   $news->appendChild($newtitle);
   $newtitle_val=$doc->createTextNode($news_title);
   $newtitle->appendChild($newtitle_val);

   $newcontent=$doc->createElement("news_content");
   $news->appendChild($newcontent);
   $newcontent_val=$doc->createTextNode($news_content);
   $newcontent->appendChild($newcontent_val);

    $newadddate=$doc->createElement("news_adddate");
    $news->appendChild($newadddate);
    $newadddate_val=$doc->createTextNode($news_adddate);
    $newadddate->appendChild($newadddate_val);

    $xfontfacetitle=$doc->createElement("fontfacetitle");
    $news->appendChild($xfontfacetitle);

     $xfontfamilytitle = $doc->createElement("fontfamilytitle");
     $news->appendChild($xfontfamilytitle);

     $xfontfacecontent =$doc->createElement("fontfacecontent");
     $news->appendChild($xfontfacecontent); 

     $xfontfamilycontent =$doc->createElement("fontfamilycontent");
     $news->appendChild($xfontfamilycontent);

     $xfontfaceadddate =$doc->createElement("fontfaceadddate");
     $news->appendChild($xfontfaceadddate); 

     $xfontfamilyadddate =$doc->createElement("fontfamilyadddate");
     $news->appendChild($xfontfamilyadddate);

     $arr=$res->FontfaceList;
$fp=fopen('news.xml',"w");
    fwrite($fp,$doc->saveXML());