PHP5 控制 XML－Felix's Second Life 電腦數碼世界

$dom = new DomDocument("1.0"); // 建立物件, 用於控制XML
$xmlfile = "favorite/".$_SESSION['login_id'].".xml";
  if(file_exists($xmlfile))
   {
   $dom -> load($xmlfile);
   }
  else
   {
   $root = $dom -> createElement("favorites");
   $dom -> appendChild($root);
   }
if(isset($_POST['web_name']))
{
  $web_name = $_POST['web_name'];
  $web_address = $_POST['address'];
  if(!ereg("://",$web_address))
   $web_address = "http://".$web_address;
  $favorite = $dom -> createElement("favorite"); // 建立節點
  $name = $dom -> createElement("name");
  $address = $dom -> createElement("address");
  $nameText = $dom -> createTextNode($web_name); // 建立節點內容
  $addressText = $dom -> createTextNode($web_address);
  $name -> appendChild($nameText); // 導入節點,這時候才算把節點加進去
  $address -> appendChild($addressText);
  $favorite -> appendChild($name);
  $favorite -> appendChild($address);
  $dom -> getElementsByTagName("favorites") -> item(0) -> appendChild($favorite); //修改舊的XML 檔案...跟建立一個新的是不一樣的.. 另外增加節點...如果不用ITEM(0)..不能加入
  $dom -> save($xmlfile);
}
$favorite = $dom -> getElementsByTagName("favorite"); // 取得$dom 之下所有 FAVORITE 節點的陣列...
foreach ($favorite as $favo)
  {
   $name= $favo -> getElementsByTagName("name");
   $address = $favo -> getElementsByTagName("address");
   $address = $address -> item(0)->nodeValue;
   $name = $name -> item(0)->nodeValue;
   echo '<a href="'.$address.'">'.$name.'</a><br />';
  }