Rss Reader Com Php E Ajax

[hitech]

Estou usando o seguinte código para fazer o parse e exibir os feeds RSS:

<?php

// ***** BEGIN ***** get the q parameter from URL ***** BEGIN *****

$q=$_GET["q"];//find out which feed was selected

if($q=="Google")

{

$xml=("http://rss.terra.com.br/0,,EI1,00.xml");

}

elseif($q=="MSNBC")

{

$xml=("http://feeds.folha.uol.com.br/folha/emcimadahora/rss091.xml");

}

$xmlDoc = new DOMDocument();

$xmlDoc->load($xml);

// ***** BEGIN ***** get elements from "<channel>" ***** BEGIN *****

$channel=$xmlDoc->getElementsByTagName('channel')->item(0);

$channel_title = $channel->getElementsByTagName('title')->item(0)->childNodes->item(0)->nodeValue;

$channel_link = $channel->getElementsByTagName('link')->item(0)->childNodes->item(0)->nodeValue;

$channel_desc = $channel->getElementsByTagName('description')->item(0)->childNodes->item(0)->nodeValue;

//***** BEGIN ***** output elements from "<channel>" ***** BEGIN *****

echo("<p><a href='" . $channel_link . "'>" . $channel_title . "</a>");

echo("<br />");

echo($channel_desc . "</p>");

// ***** BEGIN ***** get and output "<item>" elements ***** BEGIN *****

$x=$xmlDoc->getElementsByTagName('item');

for ($i=0; $i<=15; $i++)

{

$item_title=$x->item($i)->getElementsByTagName('title')->item(0)->childNodes->item(0)->nodeValue;

$item_link=$x->item($i)->getElementsByTagName('link')->item(0)->childNodes->item(0)->nodeValue;

$item_desc=$x->item($i)->getElementsByTagName('description')->item(0)->childNodes->item(0)->nodeValue;

echo ("<p><a href='" . $item_link . "'>" . $item_title . "</a>");

echo ("<br />");

echo ($item_desc . "</p>");

echo("<hr>");

}

?>

O problema é que o laço for ($i=0; $i<=15; $i++) exibe apenas o número de itens especificado (no caso, 15 itens).

Como faço para exibir todos os itens do RSS?

Obrigado,

Hélcio