wordpress-post-caching.php

<?php
/**
 * A couple of functions for caching the global post object so that contextual
 * stuff (eg: sidebars) still works after custom queries
 * NOT for use with query_posts(). Real WP coders always do a new WP_Query.
 */
function sd_cache_post() {
	global $post, $sd_cached_post;
	$sd_cached_post = $post;
}
function sd_revert_post() {
	global $post, $sd_cached_post;
	if ( is_object($sd_cached_post) && isset($sd_cached_post->ID) && $sd_cached_post->ID !== $post->ID ) {
		$post = $sd_cached_post;
		setup_postdata($post);
	}
}