Generate RSS feed for files in a directory folder. Put this file in a folder with files, modify the $allowed_ext variable to customize your extensions, and $feedName, $feedDesc, $feedURL, and $feedBaseURL. Then navigate to the folder on the web to see the xml feed. Done!

index.php

<?php
header('Content-type: text/xml');
/*
	Runs from a directory containing files to provide an
	RSS 2.0 feed that contains the list and modification times for all the
	files.

*/
$feedName = "Name";
$feedDesc = "Description";
$feedURL = "https://example.com/";
$feedBaseURL = "https://example.com/"; // must end in trailing forward slash (/).

$allowed_ext = ".mp3";

$files = array();
$dir=opendir("./");

$i = 0;
while(($file = readdir($dir)) !== false)  
{  
	$path_info = pathinfo($file);
	$ext = strtolower($path_info['extension']);

	if($file !== '.' && $file !== '..' && !is_dir($file) && strpos($allowed_ext, $ext)>0)  
	{  
		$files[$i]['name'] = $file;  
		$files[$i]['timestamp'] = filemtime($file);
		$files[$i]['length'] = filesize($file);
		$i++;
	}  
}  
closedir($dir);

?><<?= '?'; ?>xml version="1.0"<?= '?'; ?>>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
	<channel>
		<title><?=$feedName?></title>
		<link><?=$feedURL?></link>
		<description><?=$feedDesc?></description>
		<atom:link href="http://gogglesoptional.com/bloopers" rel="self" type="application/rss+xml" />
<?php

for($i=0; $i<count($files); $i++) {
	if($files[$i] != "index.php") {
          if (!empty($files[$i]['name'])) {
		echo "	<item>\n";
		echo "		<title>". $files[$i]['name'] ."</title>\n";
		echo "		<link>". $feedBaseURL . $files[$i]['name'] . "</link>\n";
		echo '		<enclosure url="' . $feedBaseURL . $files[$i]["name"] . '" length="' . $files[$i]["length"] . '" type="audio/mpeg"/>';
		echo "\n";
		echo "		<guid>". $feedBaseURL . $files[$i]['name'] . "</guid>\n";
		echo "      <pubDate>". date(DATE_RSS, $files[$i]['timestamp']) ."</pubDate>\n";
		echo "    </item>\n";
	  }
	}
}
?>
	</channel>
</rss>