Hello Readers,
This tutorial is going explain "How to get total quantity left of simple products with different color in configurable product".

Lets see how can we do it:

paste the below code in product view file (i.e catalog/product/view.phtml)

<?php if($_product->getTypeId() == "configurable"):

$ids = $_product->getTypeInstance()->getUsedProductIds();  ?>
<ul>
<?php foreach ($ids as $id) :
    $simpleproduct = Mage::getModel('catalog/product')->load($id); ?>
         
    <?php $total = (int)Mage::getModel('cataloginventory/stock_item')->loadByProduct($simpleproduct)->getQty(); ?>

    <li><?php  echo $simpleproduct->getAttributeText('color')." - ". ("Only ".$total." Left!"); ?></li>

<?php endforeach; ?>

</ul>
<?php endif; ?>

<?php if($_product->getTypeId() == "configurable"):
In if condition, we checked whether the product is configurable or not. If it is, then we have called getTypeInstance()->getUsedProductIds() method (In short way, this is called function to function calling). Using this method, we can get all the ids of simple products linked with configurable products.

$simpleproduct = Mage::getModel('catalog/product')->load($id); ?>
The above statement will load all simple products in foreach() loop to create all object of simple products using getModel() method.

By using $simpleproduct as object we called getQty() & getAttributeText('color') method to get total quantity left of simple products with different color which is associated with configurable product.