// Store cookie with length of time
setcookie( 'recently_viewed',implode( ',', $viewed_products ), time()+(86400 * 30), '/' );
//Run query to get records for recently viewed products and exclude current viewed item
$listOfViewed = implode( ',',$viewed_products);
$query = "SELECT `prod_id` , `prod_model`, `prod_mainImage`, `prod_name`
FROM products WHERE `prod_id` IN ($listOfViewed) AND `prod_id` != '{$currentProduct}' ";
$recentProducts = $wpdb->get_results($query, ARRAY_A);
//Create output for list of recent products. I have also included the image.
$output = "";
foreach($recentProducts as $prod)
{
$imgSrc = "/thumbnails/{$prod['prod_mainImage']}'";
$output .= "
$output .= "<img title="{$prod[" src="{$imgSrc}" alt="{$_name']}";
$output .= "{$prod['prod_name']}";
$output .= "{$prod['prod_model']}";
}

echo "Recently Viewed"; 
{$output}";
}