<?php
add_action( 'wp_head', 'remove_feeds_from_wp_head', 1 );
/**
 * Remove feed links from wp_head
 */
function remove_feeds_from_wp_head() {

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

    // Remove Really Simple Discovery Link
    remove_action( 'wp_head', 'rsd_link' );

    // Remove referecne to index page
    remove_action('wp_head', 'index_rel_link');
}

foreach( array( 'rdf', 'rss', 'rss2', 'atom' ) as $feed ) {
    add_action( 'do_feed_' . $feed, 'remove_feeds', 1 );
}
unset( $feed );
/**
 * prefect actions from firing on feeds when the `do_feed` function is
 * called
 */
function remove_feeds() {
    // redirect the feeds! don't just kill them
    wp_redirect( home_url(), 302 );
    exit();
}

add_action( 'init', 'kill_feed_endpoint', 99 );
/**
 * Remove the `feed` endpoint
 */
function kill_feed_endpoint() {
    // This is extremely brittle.
    // $wp_rewrite->feeds is public right now, but later versions of WP
    // might change that
    global $wp_rewrite;
    $wp_rewrite->feeds = array();
}

register_activation_hook( __FILE__, 'activation_hook' );
/**
 * Activation hook
 */
function activation_hook() {
    kill_feed_endpoint();
    flush_rewrite_rules();
}