disable indexation of feed - in a SEO friendly matter

functions.php

// Disable RSS Feeds
function disable_rss_feeds() {
	status_header( 410 ); // 410 Gone
	nocache_headers();

	header( 'X-Robots-Tag: noindex, nofollow', true );
	header( 'Content-Type: text/html; charset=utf-8' );
	echo wp_kses_post(
		__( 'Acest feed nu mai este disponibil. Vizitează <a href="' . esc_url( home_url( '/' ) ) . '">pagina principală</a>.' )
	);

	exit;
}

add_action( 'do_feed', 'disable_rss_feeds', 1 );
add_action( 'do_feed_rdf', 'disable_rss_feeds', 1 );
add_action( 'do_feed_rss', 'disable_rss_feeds', 1 );
add_action( 'do_feed_rss2', 'disable_rss_feeds', 1 );
add_action( 'do_feed_atom', 'disable_rss_feeds', 1 );
add_action( 'do_feed_rss2_comments', 'disable_rss_feeds', 1 );
add_action( 'do_feed_atom_comments', 'disable_rss_feeds', 1 );

// Remove RSS feed links from header
remove_action( 'wp_head', 'feed_links', 2 );
remove_action( 'wp_head', 'feed_links_extra', 3 );