Breadcrumbs are very useful for user navigation. Breadcrumbs for product page, category page, etc. are created by default Magento code.

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The following code will show breadcrumbs created by Magento. You can print the following code anywhere in php or phtml files.

    echo $this->getLayout()->getBlock('breadcrumbs')->toHtml();
  

You can create you own breadcrumbs as well. Like, you may need to create breadcrumbs if you have your own custom built module. I will show you here, how you can do it.

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It’s simple and easy. At first, you will define the breadcrumbs block. Then, you will add label, title and link to your breadcrumbs. The addCrumb Magento function is used in this case.

    $breadcrumbs = $this->getLayout()->getBlock('breadcrumbs');
         
$breadcrumbs->addCrumb('home', array('label'=>Mage::helper('cms')->__('Home'), 'title'=>Mage::helper('cms')->__('Home Page'), 'link'=>Mage::getBaseUrl()));
 
$breadcrumbs->addCrumb('country', array('label'=>'Country', 'title'=>'All Countries', 'link'=>'http://example.com/magento/moduleName/country'));
 
$breadcrumbs->addCrumb('manufacturer', array('label'=>'State', 'title'=>'States'));
 
echo $this->getLayout()->getBlock('breadcrumbs')->toHtml();
  

The label, title and link can be changed according to your need and requirement.

Hope this helps. Thanks.

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來源： http://blog.chapagain.com.np/magento-easily-add-breadcrumbs-to-any-page/

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Magento產品頁面的面包屑導航很怪異：如果從Category產品列表中進入Product，則面包屑導航中含有Category Path; 否則，當從首頁，或搜索結果中，或者其他什么地方進入，則缺少之。我想，可能是Magento支持一個產品放入多個Category的緣故吧。不管怎么 樣，產品頁中缺少了Category Path，用戶體驗不大好。如下：

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修正的方法，找到文件

app/code/core/Mage/Catalog/Helper/Data.php

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復制一份到local代碼池

app/code/local/Mage/Catalog/Helper/Data.php

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在函數getBreadcrumbPath的開始部分，加上如下的代碼邏輯：

      /**
 * Return current category path or get it from current category
 * and creating array of categories|product paths for breadcrumbs
 *
 * @return string
 */
public function getBreadcrumbPath()
{
    // added by p.c.w.l 20110603
    if ($this->getProduct() && !$this->getCategory()) {
       $_categoryIds = $this->getProduct()->getCategoryIds();

       if ($_categoryId = $_categoryIds[0]) {
          $_category = Mage::getModel('catalog/category')->load($_categoryId);
          Mage::register('current_category', $_category);
       }
    }

    // ...

    

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首先判斷當前是否是產品頁，如果是并且沒有Category信息，就獲取產品所屬的Category IDs， Magento 中一個產品可以加入多個Category中，但不管三七二十一只挑出其中一個幸運的Category作為current_category。看最終的效果：

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來源： http://www.sqlstudy.com/article/magento-product-page-breadcrumb-add-category-path.html

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Magento產品頁面包屑導航(Breadcrumb)修正 Showing Breadcrumbs Anywhere in Magento