Redirect to last post viewed instead of confirmation page

my_pmpro_confirmation_url.php

<?php

/*
 * Remember last post ID
 */
function my_wp() {
	global $post, $pmpro_pages;
	//don't track pmpro pages
	if( ! in_array($post->ID, $pmpro_pages))
		setcookie('last_post_viewed', $post->ID, null, '/');
}
add_action('wp', 'my_wp');

/*
 * Change login link in confirmation email to append last viewed post
 */

/*
 * Redirect to last post instead of Confirmation page
 */
function my_pmpro_confirmation_url($url, $user_id, $level) {
	if(!empty($_COOKIE['last_post_viewed']))
		$url = get_the_permalink($_COOKIE['last_post_viewed']);
	return $url;
}
add_filter('pmpro_confirmation_url', 'my_pmpro_confirmation_url', 10, 3);