As part of an ongoing project, I was using the CakePHP's htmlHelper to generate breadcrumbs.
Now combined with the tree behavior's getpath function, the $html->addCrumb() and $html->getCrumbs() functions are great and a real time saver, but...
...for this particular page I actually want to show two or more different bread crumb trails, one for location, and one or more for categories, and that's where I hit a snag, as it stands the htmlhelper allows you to keep adding crumbs and displaying the trail so far, but has no way of clearing the protected _crumbs array, should you need to make more than one trail.
AppHelper to the rescue
Since the app_helper file was added to CakePHP you now have the facility to add additional functionality to built in helpers so by adding the following code to app_helper.php:
* enhancement to htmlHelper which allows the crumbs protected array
* to be cleared so that more than one set of crumbs can be generated in the same view.
* @author Peter Butler firstname.lastname@example.org
* @return void
* @access public
$this->_crumbs = array();
You can now use $html->clearCrumbs() to clear down and build a second, third or however many breadcrumb trails you need.
Hope you find this usefull,