Webpage Bread crumbing is common feature in web development. Breadcrumbs usually appear horizontally across the top of a web page, normally just below title bars or headers. Breadcrumb gives users a way to keep track of their locations within programs or documents. For using breadCrumb there must be a common component whether its can be effective in all pages through out the Site.
Here I show how to create and use a breadcrumb component in CakePHP.

<?php	
class BreadcrumbComponent extends Object
{
  var $controller;
  var $components = array('Session','Acl');

  function startup(&$controller)
  {
    $this->controller =& $controller; 
  }
    
	function setBreadcrumb($url)
	{
		$crumbs = split('/',$url);
		$link = '/';
		
		if($crumbs[0] != 'admin')
		{
			$breadcrumb[] = array('home', $link);
		}
		
		foreach($crumbs AS $crumb)
		{
			$name = str_replace('_',' ', $crumb);
			$link .= $crumb.'/';
			if($name && !is_numeric($name))
			{
				$breadcrumb[] = array($name,$link);
			}
			elseif(is_numeric($name))
			{
				$key = count($breadcrumb)-1;
				$breadcrumb[$key][1].= $name;
			}
		}
		
		return $breadcrumb;
	}
	
}
?>

Load the Component:

var $components = array( 'Breadcrumb');

Call from the controller:

function beforeRender()
	{
		$this->set('breadcrumb', $this->Breadcrumb->setBreadcrumb($this->params['url']['url']));
	}

This need to be modified according to sitemap