WordPress / Disable RSS Feeds

functions.php

<?php
/**
 * Disable all RSS Feeds actions and filters in WordPress.
 *
 * @author Guy Dumais.
 * @link https://en.guydumais.digital/how-to-disable-rss-feeds-in-wordpress/
 */
add_action( 'init', $af = function() {

    // Disable all RSS Feeds actions.
    remove_action( 'do_feed_rdf', 'do_feed_rdf', 10 );
    remove_action( 'do_feed_rss', 'do_feed_rss', 10 );
    remove_action( 'do_feed_rss2', 'do_feed_rss2', 10 );
    remove_action( 'do_feed_atom', 'do_feed_atom', 10 );
    remove_action( 'wp_head', 'feed_links_extra', 3 );
    remove_action( 'wp_head', 'feed_links', 2 );

    // Disable all RSS Feeds filters.
    remove_filter( 'the_content_feed', '_oembed_filter_feed_content' );

} );
unset( $af );