SimpleXML 操作

class SimpleXMLExtended extends SimpleXMLElement
  {
  public function addCData($cdata_text)
    {
    $node = dom_import_simplexml($this);
    $no   = $node->ownerDocument;
    $node->appendChild($no->createCDATASection($cdata_text));
    }
  }

$simple=new SimpleXMLExtended('<message/>');

while($row=mysql_fetch_assoc($res)){
$msg=$simple->addChild('msg');
$msg->addAttribute('id',$row['mid']);
$msg->addAttribute('isread',$row['isread']);
$msg->addChild('pos',$row['pos']);
$msg->addChild('rec',$row['rec']);
$msg->addChild('content');
$msg->content->addCData($row['content']);
}

echo $simple->asXML();