Move category

$category = Mage::getModel('catalog/category')->load($idCategoryForMoving);
$category->move($idParentCategory, $idAfterCategory);

Getting filterable attributes in category

Getting filterable attributes from layered navigation

$category = Mage::registry('current_category');
$products = $category->getProductCollection();

$appliedFilters = Mage::getSingleton('catalog/layer')->getFilterableAttributes();
foreach ($appliedFilters as $filter) {
  if ($value = $this->getRequest()->getParam($filter->getAttributeCode())) {
      $products->addFieldToFilter($filter->getAttributeCode(), $value);
  }
}

Method getFilterableAttributes returns all available attributes for filtering. Then in foreach we check if an attribute has been selected by user, we add it to the filter.

Increase the size of a VDI file

You can only increase size

VBoxManage modifyhd YourFile.vdi --resize 32240

Include third party libraries

For including third party libraries from lib folder

require_once(Mage::getBaseDir('lib') . '/simple_html_dom.php');