How to get sub-categories of a specific parent category?

Question

I had a main category (parent category) whose id = 10. I want to echo just its sub-categories. How can I do that?

Answer 1

To get all the active as well as inactive sub categories

$parent_category_id = 10;

$child_categories = Mage::getResourceModel('catalog/category_collection')
                ->addAttributeToSelect('*')
               ->addAttributeToFilter('is_active', array('in' => array(0,1)))
              ->addAttributeToFilter('parent_id', $parent_category_id);

foreach ($child_categories as $cat)
{
    $sub_category_id = $cat->getId();
    $sub_category_name = $cat->getName();
}