Magento subcategories of a Specific category

Magento subcategories of a specific  category : This is very useful and important code when you are dealing with customizing  magento . There are two ways to display subcategories in phtml file using magento models

Solution One :  Using getCategories() Method

$_categories = Mage::getModel('catalog/category')
                   ->getCategories(113); // 113 is category ID

here is the rest of the code (This code is from our snippet so you may ignore some of them)

<select id="category">
<?php if (count($_categories) > 0): ?>
<?php foreach($_categories as $_category): ?>
<option  name="<?php echo $_category['entity_id']?>" 
value="<?php echo $_category['entity_id']?>">
<?php echo $_category->getName();?></option>
<?php endforeach; ?>
<?php endif; ?>									
</select>

Solution Two: using Load() getChildren() Method .

$root = Mage::getModel('catalog/category')->load(66); // Put your category ID here.
$subCat = explode(',',$root->getChildren()); 
//get the collection add filter using the exploded categories
$collection  = $root
             ->getCollection()
             ->addAttributeToSelect("*")
             ->addFieldToFilter("entity_id", array("in", $subCat) );

and to display in them use the same code as above . enjoy magento coding