<?php

$url = "http://rss.cnn.com/rss/edition.rss"; // Buraya feed linkini yaz
if(isset($_POST['submit'])){
if($_POST['feedurl'] != ''){
$url = $_POST['feedurl'];
}
}

$invalidurl = false;
if(@simplexml_load_file($url)){
$feeds = simplexml_load_file($url);
}else{
$invalidurl = true;
echo "<h2>Invalid RSS feed URL.</h2>";
}


$i=0;
if(!empty($feeds)){

$site = $feeds->channel->title;
$sitelink = $feeds->channel->link;

echo "<h1>".$site."</h1>";
foreach ($feeds->channel->item as $item) {

$title = $item->title;
$link = $item->link;
$description = $item->description;
$postDate = $item->pubDate;
$pubDate = date('D, d M Y',strtotime($postDate));


if($i>=5) break;
?>
<div class="post">
<div class="post-head">
<h2><a class="feed_title" href="<?php echo $link; ?>"><?php echo $title; ?></a></h2>
<span><?php echo $pubDate; ?></span>
</div>
<div class="post-content">
<?php echo implode(' ', array_slice(explode(' ', $description), 0, 20)) . "..."; ?> <a href="<?php echo $link; ?>">Daha fazla...</a>
</div>
</div>

<?php
$i++;
}
}else{
if(!$invalidurl){
echo "<h2>No item found</h2>";
}
}
?>
</div>

kodu direk yapistir bos bir sayfa icerisine, goreceksin. Ondan sonra nereye nasil koymak istiyorsan koyup css duzenlemesini yaparsin.