feed.php

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>SITENAME - rss feed</title>
<link href="https://getbootstrap.com/docs/4.5/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous">
</head>
 <body>
<h1>SITENAME RSS Feed Reader</h1>
<form action="" method="post">
<p>Enter site's feed url<br/> <input type="text" name="feedUrl" value="https://en.wikipedia.org/w/api.php?hidebots=1&hidecategorization=1&hideWikibase=1&urlversion=1&days=7&limit=50&action=feedrecentchanges&feedformat=rss"/></p>
<p><input type="submit" name="feed"/></p>
</form>
<?php
if (isset($_POST['feed'])) {
    $link = $_POST['feedUrl'];
$rss_feed = simplexml_load_file("$link");
if(!empty($rss_feed)) {
$i=0;
foreach ($rss_feed->channel->item as $feed_item) {
if($i>=10) break;
?>
<div><a class="feed_title" href="<?php echo $feed_item->link; ?>"><?php echo $feed_item->title; ?></a></div>
<div><?php echo implode(' ', array_slice(explode(' ', $feed_item->description), 0, 14)) . "..."; ?></div>
<?php
$i++;
}}
}
?>
 </body>
 </html>