Yii框架 书写xml接口

<?php 
class  InterfacesController extends Controller{    
    /*
    * 会员访问记录XML接口
    * 2015-07-15
    */   
   public function actionMemberrecordlist(){     
        //获取url路径传来的参数
        $stardate=$_GET['stardate'];
        $ltime=$_GET['ltime'];
        $key=$_GET['key'];
        $mykey=md5($stardate.$ltime.'asde89dsmm'); 
        //判断ltime请求的时间是否大于60秒    
        //判断钥匙是否正确  
        if($key!=$mykey) {
            echo  '密钥错误'; //表示非法请求
            exit();
        } 
        if( $ltime+60<=(time())){
            echo  '时间超时'; //表示非法请求
            exit();
        }
        //满足条件查询用户访问记录表
         $sql="select user_name,reference_url,module,action,login_ip,login_time  
                  from `smm_en_user_log` 
                  where login_time>='{$stardate}' and user_name !=''";
        
            $result=Yii::app()->db->createCommand($sql)->queryAll();
            if($result){        
                $html='<?xml version="1.0" encoding="UTF-8" ?>
                        <memberrecordlist xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schem                        aLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">';
                   foreach ($result as $key => $value) {
                     if(preg_match('/(\<*\>)+/',$value['action'])){
                          continue;
                      }else{
                        $html.='<recordinfo>
                          <email>'.$value['user_name'].'</email>
                          <source>'.$value['reference_url'].'</source>
                          <items>'.$value['module'].'</items>
                          <content>'.$value['action'].'</content>
                          <ip>'.$value['login_ip'].'</ip>
                          <date>'.$value['login_time'].'</date>
                         </recordinfo>';
                      }        
                    }
                 $html.='</memberrecordlist>';
                 echo $html;
            }else{
                 echo  '对不起，查询的数据为空，没有满足需求的数据！';
                 exit();
            }
       
   }