Magento: Get all category and subcategory products

<?php

require_once('app/Mage.php');

umask(0);

Mage::app('admin');

set_time_limit(0);

$category = Mage::getModel('catalog/category');

$tree = $category->getTreeModel();

$tree->load();

$ids = $tree->getCollection()->getAllIds();

if ($ids)

{

     foreach ($ids as $id)

  {

     $cat = Mage::getModel('catalog/category');

     $cat->load($id);

     if($cat->getLevel()==3 && $cat->getIsActive()==1)

     {

        $category1 = Mage::getModel('catalog/category')->load($cat->getId());

        $products = Mage::getResourceModel('catalog/product_collection')

                                ->addAttributeToSelect('name')

                             ->addCategoryFilter($category1);

        echo "<b>".$cat->getName()."</b><br>";

        foreach ($products as $product) { //print_r($product->getData());exit;

                echo " &nbsp; &nbsp; &nbsp; " . $product->getName() . " - ". $product->getSku() . "<br/>";

        }

     }

  }

}

?>