I try to show what categories the product is included in the product page with a fillter so I only show the product in a certain category or its subcategories.
I have a category (id 10) I put all the campaigns in subcategories At the product level, I would then see if the product is in category 10 or its sub-categories with a clickable link to the category.
Here's is what i got so far. This code bellow gives med all categories that the product is in
<?php
$currentCatIds = $_product->getCategoryIds();
$categoryCollection = Mage::getResourceModel('catalog/category_collection')
->addAttributeToSelect('name')
->addAttributeToSelect('url')
->addFieldToFilter('level', array('eq' => 4))
->addAttributeToFilter('entity_id', $currentCatIds)
->addIsActiveFilter();
?>
And here is my output
<?php foreach($categoryCollection as $cat):?>
<a href="<?php echo $cat->getUrl(); ?>" title="<?php echo $cat->getName(); ?>"><?php echo $cat->getName();?></a></br>
<?php endforeach; ?>
