WordPress: Breadcrumb Functions

gistfile1.aw

<?php
/*
Plugin Name: Breadcrumb Functions
Description: Functions for displaying breadcrumbs when working with hierarchical post types. Does nothing out-of-the-box, functions must be added to theme (directly or via hooks, your discretion).
Author: Kailey Lampert
Author URI: http://kaileylampert.com/
*/
/*
	Basic:
		echo get_breadcrumbs( $post );
		//returns: <p><a href='{post_url}'>{post_title}</a> &gt; <a href='{post_url}'>{post_title}</a></p>

	Advanced:
		echo get_breadcrumbs( $post, array( 'before_all' => '<ol>', 'after_all' => '</ol>', 'before_each' => '<li>', 'after_each' => '</li>', 'separator' => '' ) );
		//returns: <ol><li><a href='{post_url}'>{post_title}</a></li><li><a href='{post_url}'>{post_title}</a></li></ol>
*/

function get_breadcrumbs( $starting_page, $deco = array( 'before_all' => '<p>', 'after_all' => '</p>', 'before_each' => '', 'after_each' => '', 'separator' => ' &gt; ' ) ) {
	//get our "decorations"
	extract( $deco );
	//reverse it so the highest (most-parent?) page is first
	$ids = array_reverse( _get_breadcrumbs( $post ) );
	//if only one id, there are no parents. show nothing
	if ( count( $ids ) <= 1 ) return '';
	//loop through each, create decorated links
	$links = array();
	foreach ( $ids as $url => $title ) {
		$links[] = "$before_each<a href='$url'>$title</a>$after_each";
	}
	//return it all together
	return $before_all . implode( $separator, $links ) . $after_all;
}

//recursive function for getting all parent, grandparent, etc. IDs
//not intended for direct use
function _get_breadcrumbs( $starting_page, $container = array() ) {

	//make sure you're working with an object
	$sp = ( ! is_object( $starting_page ) ) ? get_post( $starting_page ) : $starting_page;
	
	//make sure to insert starting page only once
	if ( ! in_array( get_permalink( $sp->ID ), $container ) )
		$container[ get_permalink( $sp->ID ) ] = get_the_title( $sp->ID );
	
	//if parent, recursion!
	if ( $sp->post_parent > 0 ) {
		$container[ get_permalink( $sp->post_parent ) ] = get_the_title( $sp->post_parent );
		$container = _get_breadcrumbs( $sp->post_parent, $container );
	}
	
	return $container;
}