Magento hreflang Implementation

Using code from a previous discussion (link:https://magento.stackexchange.com/questions/12504/how-to-add-hreflang-tags-or-other-meta-tags-to-pages-in-magento), I was able to implement the hreflang links into our Magento site.

Here is the code that worked for me:

    <?php foreach (Mage::app()->getWebsites() as $website) {
    foreach ($website->getGroups() as $group) {
        $stores = $group->getStores();
        foreach ($stores as $store) {
            $storeId = $store->getId();
            $storeCode = substr(Mage::getStoreConfig('general/locale/code', $storeId),0,2);
            if (Mage::registry('product')) {
                $productId  = Mage::registry('product')->getId();
                $base_url = Mage::app()->getStore($storeId)->getBaseUrl(Mage_Core_Model_Store::URL_TYPE_LINK);
                $url = Mage::getModel('catalog/product')->setStoreId($storeId)->load($productId)->getProductUrl();
                $url = preg_replace('/?.*/', '', $url); 
                echo '<link rel="alternate" hreflang="' . $storeCode . '" href="' . $url . '"/>';}
            elseif(Mage::registry('current_category')) { 
                $categoryId = Mage::registry('current_category')->getId();
                $base_url = Mage::app()->getStore($storeId)->getBaseUrl(Mage_Core_Model_Store::URL_TYPE_LINK);
                $url = Mage::getModel('catalog/category')->setStoreId($storeId)->load($categoryId)->getUrlPath();
                echo '<link rel="alternate" hreflang="' . $storeCode . '" href="' . $base_url . $url . '"/>' . "n";
                }}}} 
?>
<?php 
            $storeId = 1;
            if (Mage::registry('product')) {
                $productId  = Mage::registry('product')->getId();
                $base_url = Mage::app()->getStore($storeId)->getBaseUrl(Mage_Core_Model_Store::URL_TYPE_LINK);
                $url = Mage::getModel('catalog/product')->setStoreId($storeId)->load($productId)->getProductUrl();
                $url = preg_replace('/?.*/', '', $url); 
                echo '<link rel="alternate" hreflang="x-default" href="' . $url . '"/>';
}
            elseif(Mage::registry('current_category')) { 
                $categoryId = Mage::registry('current_category')->getId();
                $base_url = Mage::app()->getStore($storeId)->getBaseUrl(Mage_Core_Model_Store::URL_TYPE_LINK);
                $url = Mage::getModel('catalog/category')->setStoreId($storeId)->load($categoryId)->getUrlPath();
                echo '<link rel="alternate" hreflang="x-default" href="' . $base_url . $url . '"/>' . "n";
            }
?> 

I’m having an issue with layered navigation URL’s and canonical links disappearing on category pages.

Is there something I can add to this code to make sure that layered navigation URL’s that contain “?” after .html get written as shown in the browsers address bar?

Also, on these types of category pages the canonical link does not show.

The code works perfectly on product pages.

Any help would be greatly appreciated!

Thanks in advance.