RSS and RSS page for each post - php

Question

This is my RSS feed format:
<item>
<title></title>
<link></link>
<description></description>
<pubDate></pubDate>
<guid></guid>
<dc:date></dc:date>
</item>
I want to dipsplay the last 7 posts with CSS style, so I use this code:
<?php
$url = "**THE URL I AM SCRAPING DATA FROM**";
$rss = simplexml_load_file($url);
$i = 0;
if (!empty($rss))
{
$site = $rss
->channel->title;
$sitelink = $rss
->channel->link;
foreach ($rss
->channel->item as $item)
{
$title = $item->title;
$link = $item->link;
$description = $item->description;
$item->description = strip_tags($item->description);
$date = $item->pubDate;
$pubDate = date('d.m.Y', strtotime($date));
if ($i >= 7) break;
?>
<div class="post-item">
<div class="post-item-wrap">
<div class="post-image">
<a href="<?php echo $link;?>">
<img alt="" src="images/news/nra.jpg">
</a>
</div>
<div class="post-item-description">
<span class="post-meta-date"><?php echo $pubDate;?></span>
<h2><a href="<?php echo $link ?>" target="_blank"><?php echo $title;?>
</a></h2>
<p><?php echo implode(' ', array_slice(explode(' ', $description), 0, 30)) . "..";?></p>
learn more <i class="icon-chevron-right"></i>
</div>
</div>
</div>
<?php
$i++;
}
}
?>
Now I want each of these 7 posts to have unique id.
I need script to generate item -> title and item -> description depending on the item -> link.
(If I click first xml post for example it will take me to page where I can display the title and description according to which post I clicked)
Thanks in advance.

Answer 1

use this code get last 7 items
array_slice($rss->channel->item, -7);

Answer 2

If url is "rss.php?feed=1" or "rss.php?feed=2"
$rssSno=$_GET['feed'];
$output = array_slice($rss->channel->item, ($rssSno-1),1);