remove-feeds.php

<?php
/*
Plugin Name: Remove All Feeds [for WPSE33072]
Description: Remove all feeds from WordPress
Author: Christopher Davis
Author URI: http://christopherdavis.me
License: GPL2
*/


add_action( 'wp_head', 'wpse33072_wp_head', 1 );
/**
 * Remove feed links from wp_head
 */
function wpse33072_wp_head()
{
    remove_action( 'wp_head', 'feed_links', 2 );
    remove_action( 'wp_head', 'feed_links_extra', 3 );
}

foreach( array( 'rdf', 'rss', 'rss2', 'atom' ) as $feed )
{
    add_action( 'do_feed_' . $feed, 'wpse33072_remove_feeds', 1 );
}
unset( $feed );
/**
 * prefect actions from firing on feeds when the `do_feed` function is 
 * called
 */
function wpse33072_remove_feeds()
{
    // redirect the feeds! don't just kill them
    wp_redirect( home_url(), 302 );
    exit();
}

add_action( 'init', 'wpse33072_kill_feed_endpoint', 99 );
/**
 * Remove the `feed` endpoint
 */
function wpse33072_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__, 'wpse33072_activation' );
/**
 * Activation hook
 */
function wpse33072_activation()
{
    wpse33072_kill_feed_endpoint();
    flush_rewrite_rules();
}