php生成rss文件求改进

我写了一个php利用DOMDocument 组件生成rss文件的代码，但是感觉太过于臃肿，想封装成一个类但是一直没成功，特来请教
生成后rss大体是这样的





1123木头

http://www.xxx.com
id:1,user_name:,pass:123,real_name:木头




2456小木头

http://www.xxx.com
id:2,user_name:,pass:456,real_name:小木头





当然代码太过于冗余



$doc = new DOMDocument('1.0','utf-8');
$doc->formatOutput = true;


//创建标签
//创建rss标签
$rss = $doc->createElement('rss');
//创建channel下面的标签
$channel = $doc->createElement('channel');
$ctitle = $doc->createElement('title');
$clink = $doc->createElement('link');
$cdescription = $doc->createElement('description');






foreach ($arr as $key => $val) {
//创建item标签
$item = $doc->createElement('item');
//创建item下的子标签标签
$user = $doc->createElement('user');
$ititle = $doc->createElement('title');
$ilink = $doc->createElement('link');
$idescription = $doc->createElement('description');
//创建user标签
$user_id = $doc->createElement('user_id');
$user_name = $doc->createElement('user_name');
$user_pass = $doc->createElement('user_pass');
$real_name = $doc->createElement('real_name');
/*这里是需要数据库循环调用的地方*/
//创建内容
//创建item下面的标签的内容
$c_ititle = $doc->createTextNode($val['user_id']);
$c_ilink = $doc->createTextNode('http://www.xxx.com');
$c_idescription = $doc->createTextNode('id:'.$val['user_id'].',user_name:'.$val['user_name'].',pass:'.$val['pass'].',real_name:'.$val['real_name']);
//创建user下面的标签的内容
$c_user_id = $doc->createTextNode($val['user_id']);
$c_user_name = $doc->createTextNode($val['user_name']);
$c_user_pass = $doc->createTextNode($val['pass']);
$c_real_name = $doc->createTextNode($val['real_name']);
//创建item属性值
$a_id = $doc->createTextNode($val['user_id']);


//创建属性
$attributes = $doc->createAttribute('id');
/*这里是需要数据库循环调用的地方*/
//item一级标签的元素内容继承
$ititle->appendChild($c_ititle);
$ilink->appendChild($c_ilink);
$idescription->appendChild($c_idescription);
//user一级标签的元素内容继承
$user_id->appendChild($c_user_id);
$user_name->appendChild($c_user_name);
$user_pass->appendChild($c_user_pass);
$real_name->appendChild($c_real_name);
/*这里是需要数据库循环调用的地方*/
//继承
$channel->appendChild($item);
//item一级标签的标签继承
$item->appendChild($user);
$item->appendChild($ititle);
$item->appendChild($ilink);
$item->appendChild($idescription);
//id=1
$attributes->appendChild($a_id);
//
$item->appendChild($attributes);


//item一级标签的标签继承
$user->appendChild($user_id);
$user->appendChild($user_name);
$user->appendChild($user_pass);
$user->appendChild($real_name);
}




//创建内容
//创建channel下面的标签的内容
$c_ctitle = $doc->createTextNode('测试rss');
$c_clink = $doc->createTextNode('http://www.xxx.com');
$c_cdescription = $doc->createTextNode('这是一个测试rss');
//创建rss版本属性值
$rss_attribute_c = $doc->createTextNode('2.0');


//创建rss版本属性
$rss_attribute = $doc->createAttribute('version');


//继承
//channel一级标签的元素内容继承
$ctitle->appendChild($c_ctitle);
$clink->appendChild($c_clink);
$cdescription->appendChild($c_cdescription);
//version="2.0"
$rss_attribute->appendChild($rss_attribute_c);




//channel一级标签的标签继承
$channel->appendChild($ctitle);
$channel->appendChild($clink);
$channel->appendChild($cdescription);








//创建根节点
$rss->appendChild($channel);
$rss->appendChild($rss_attribute);
$doc->appendChild($rss);


//保存xml文件
$doc->save('hello.xml');


function connect_sql(){
$con = mysql_connect('localhost','root','123456') or die('mysql error :'.mysql_error());
mysql_select_db('test');
mysql_query('set names utf8');
}
function getall(){
$sql = "SELECT * FROM test";
$query = mysql_query($sql);
$content = array();
while($row = mysql_fetch_array($query)){
$content[] = $row;
}
return $content;
}


请教各位大牛，怎样改装成一个class，我试了，一直不行

回复讨论(解决方案)

为什么要用 dom 呢？
直接字符串拼装不就可以的吗？如

$ar = array(  array(    'id' => 1,    'user' => array('user_id' => 1, 'user_name' => '', 'user_pass' => 123, 'real_name' => 'aa'),     'title' => 1,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:123,real_name:aa',  ),  array(    'id' => 2,    'user' => array('user_id' => 2, 'user_name' => '', 'user_pass' => 456, 'real_name' => 'bb'),     'title' => 2,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:456,real_name:bb',  ),);

1
http://www.xxx.comid:1,user_name:,pass:123,real_name:aa2
http://www.xxx.comid:1,user_name:,pass:456,real_name:bb

为什么要用 dom 呢？
直接字符串拼装不就可以的吗？如

$ar = array(  array(    'id' => 1,    'user' => array('user_id' => 1, 'user_name' => '', 'user_pass' => 123, 'real_name' => 'aa'),     'title' => 1,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:123,real_name:aa',  ),  array(    'id' => 2,    'user' => array('user_id' => 2, 'user_name' => '', 'user_pass' => 456, 'real_name' => 'bb'),     'title' => 2,    'link' => 'http://www.xxx.com',    'description' => 'id:1,user_name:,pass:456,real_name:bb',  ),);

1
http://www.xxx.comid:1,user_name:,pass:123,real_name:aa2
http://www.xxx.comid:1,user_name:,pass:456,real_name:bb

直接echo输出，然后fwrite写到一个xml文件中，这个好弄，只是我觉得既然php有自带的domdocument组件，那么是不是肯定有他的优点相比于直接拼凑生成文件，这个目前不清楚