PHP实现动态创建XML文档的方法

<?php
$id=mysql_connect("localhost","root","root") or die('数据库连接失败:' . mysql_error());
if(mysql_select_db("db_database26",$id))
 echo "";
 else
 echo ('数据库错误' . mysql_error());
mysql_query("set names gb2312");
?>

<a
ref="rss.xml">查看rss.xml文件中的内容</a>
<?php
include_once("conn/conn.php");
include_once("rss.php");
?>

<?php
$self=$_server['http_referer'];
$u=$_server['http_host'];
$url="http://"."$u";
$date_time=date("y-m-d h:i:s");
$dom = new domdocument('1.0','gb2312');           //创建dom对象
$object = $dom->createelement('rss');            //创建根节点rss
$dom->appendchild($object);                 //将创建的根节点添加到dom对象中
  $type1 = $dom->createattribute('xmlns:rdf');     //创建一个节点属性xmlns:rdf
  $object->appendchild($type1);              //将属性追加到rss根节点中
    $type1_value = $dom->createtextnode('http://www.w3.org/1999/02/22-rdf-syntax-ns#'); //创建一个属性值
    $type1->appendchild($type1_value);                //将属性值赋给属性xmlns:rdf
  $type2 = $dom->createattribute('xmlns:dc');             //创建一个节点属性xmlns:dc
  $object->appendchild($type2);              //将属性追加到rss根节点中
    $type2_value = $dom->createtextnode('http://purl.org/dc/elements/1.1/'); //创建一个属性值
    $type2->appendchild($type2_value);                //将属性值赋给属性xmlns:dc
  $type3 = $dom->createattribute('xmlns:taxo');              //创建一个节点属性xmlns:taxo
  $object->appendchild($type3);              //将属性追加到rss根节点中
    $type3_value = $dom->createtextnode('http://purl.org/rss/1.0/modules/taxonomy/'); //创建一个属性值
    $type3->appendchild($type3_value);                //将属性值赋给属性xmlns:taxo
  $type4 = $dom->createattribute('version');              //创建一个节点属性version
  $object->appendchild($type4);              //将属性追加到rss根节点中
    $type4_value = $dom->createtextnode('2.0');   //创建一个属性值
    $type4->appendchild($type4_value);          //将属性值赋给属性version
  $channel = $dom->createelement('channel');              //创建节点channel
  $object->appendchild($channel);                 //将节点channel追加到根节点rss下
    $title = $dom->createelement('title');            //创建节点title
    $channel->appendchild($title);                //将节点追加到channel节点下
      $title_value = $dom->createtextnode(iconv('gb2312','utf-8','明日科技')); //创建元素值
      $title->appendchild($title_value);            //将值赋给title节点
    $link = $dom->createelement('link');         //创建节点link
    $channel->appendchild($link);              //将节点追加到channel节点下
      $link_value = $dom->createtextnode(iconv('gb2312','utf-8','http://www.mingrisoft.com'));//创建元素值
      $link->appendchild($link_value);           //将值赋给link节点
    $description = $dom->createelement('description');          //创建节点description
    $channel->appendchild($description);           //将节点追加到channel节点下
      $description_value = $dom->createtextnode(iconv('gb2312','utf-8','明日科技'));  //创建元素值
      $description->appendchild($description_value);              //将值赋给description节点
    $dc_creator = $dom->createelement('dc:creator');         //创建节点dc:creator
    $channel->appendchild($dc_creator);           //将节点追加到channel节点中
      $dc_creator_value = $dom->createtextnode(iconv('gb2312','utf-8','http://www.mingrisoft.com'));//创建元素值
      $dc_creator->appendchild($dc_creator_value);           //将值赋给dc:creator节点
$sql=mysql_query("select * from tb_rss_database order by tb_rss_id desc");   //从数据库中读取数据
while($myrow=mysql_fetch_array($sql)){       //循环输出数据库中数据
    $item = $dom->createelement('item');     //创建节点item
    $object->appendchild($item);             //将item追加到channel节点下
      $item_title = $dom->createelement('title');         //创建title节点
      $item->appendchild($item_title);           //将节点追加到item节点下
      $item_link = $dom->createelement('link');          //创建link节点
      $item->appendchild($item_link);           //将节点追加到item节点下
      $item_description = $dom->createelement('description');   //创建description节点
      $item->appendchild($item_description);            //将节点追加到item节点中
      $item_pubdate = $dom->createelement('pubdate');       //创建节点pubdate
      $item->appendchild($item_pubdate);            //将节点追加到item节点下
        $title_value = $dom->createtextnode(iconv('gb2312','utf-8',"$myrow[tb_rss_subject]"));  //创建元素值
        $item_title->appendchild($title_value);           //将值赋给title节点
        $link_value = $dom->createtextnode(iconv('gb2312','utf-8',"$url/tm/sl/22/02/look_content.php?lmbs=$myrow[tb_rss_id]"));//创建元素值
        $item_link->appendchild($link_value);            //将值赋给link节点
        $description=substr($myrow[tb_rss_content],0,80);      //截取该字段中的前80个字符
        $description_value = $dom->createtextnode(iconv('gb2312','utf-8',"$description"));//创建元素值
        $item_description->appendchild($description_value);     //将值赋给description节点
        $pubdate_value = $dom->createtextnode(iconv('gb2312','utf-8',"$date_time"));//创建元素值
        $item_pubdate->appendchild($pubdate_value);           //将值赋给pubdate节点
}
$modi = $dom->savexml();         //生成xml文档
file_put_contents('rss.xml',$modi);     /* 将对象保存到rss.xml文档中 */
?>