Magento: How to get top rated products?

Here, I will be showing you how to get the top/highest rated product.

The basic idea for getting the top rated products is fetching all products, looping through them, getting ratings of each product and populating a ratings array. After that sort the array and then slice the array for limiting the number of product to display.

Here is the function to get the top rated products:-

/**
 * Get Top Rated Products
 *
 * @return array
 */
public function getTopRatedProduct() { 

 $limit = 5; 

 // get all visible products
 $_products = Mage::getModel('catalog/product')->getCollection();
 $_products->setVisibility(Mage::getSingleton('catalog/product_visibility')->getVisibleInCatalogIds());
 $_products->addAttributeToSelect('*')->addStoreFilter();            

 $_rating = array(); 

 foreach($_products as $_product) {  

  $storeId = Mage::app()->getStore()->getId(); 

  // get ratings for individual product
  $_productRating = Mage::getModel('review/review_summary')
       ->setStoreId($storeId)
       ->load($_product->getId()); 

  $_rating[] = array(
      'rating' => $_productRating['rating_summary'],
      'product' => $_product
     );
 } 

 // sort in descending order of rating
 arsort($_rating); 

 // returning limited number of products and ratings
 return array_slice($_rating, 0, $limit);
}

Now, you can display the products in any template file. Here is the sample code to display the top rated products:-

<!-- I suppose that you have put the getTopRatedProduct() function in helper class of your module -->
<?php $topRatedProducts = $this->helper('yourModule')->getTopRatedProduct();?>

<ul>
<?php foreach($topRatedProducts as $_rating): ?>
 <?php $_product = $_rating['product']; ?>
<li>
 <img src="<?php echo $this->helper('catalog/image')->init($_product, 'small_image')->resize(150); ?>"  alt="<?php echo $this->htmlEscape($this->getImageLabel($_product, 'small_image')) ?>" title="<?php echo $this->htmlEscape($this->getImageLabel($_product, 'small_image')) ?>" />
 <a href="<?php echo $_product->getProductUrl() ?>" title="<?php echo $this->htmlEscape($this->getImageLabel($_product, 'small_image')) ?>">
  <span>View Details</span>
 </a>
</li>
</ul>
<?php endforeach; ?>

Hope this helps.
Thanks.