Magento: Anchor all Categories

Add the below to controller to one of your modules:

<?php

class Company_Module_Adminhtml_AnchorController extends Mage_Adminhtml_Controller_Action {

 public function indexAction() {
 $categories = Mage::getModel('catalog/category')
 ->getCollection()
 ->addAttributeToSelect('*')
 ->addAttributeToFilter('entity_id', array("gt" => 1))
 ->setOrder('entity_id');

 $success = true;

 foreach ($categories as $category) {
 $success = $this->setAnchor($category);
 $success = $this->anchorChildren($category);
 }

 if ($success) {
 Mage::getSingleton('adminhtml/session')
 ->addSuccess("All Categories Set to Anchor");
 } else {
 Mage::getSingleton('adminhtml/session')
 ->addError("Anchor Process Failed for Some Categories");
 }
 $this->_redirectUrl($this->_getRefererUrl());
}

 protected function anchorChildren($category) {
 $children = $category->getChildrenCategories();
 if (count($children) > 0) {
 $success = true;
 foreach ($children as $child) {
 $success = $this->setAnchor($child);
 }
 } else {
 $success = true;
 }
 return $success;
 }

 protected function setAnchor($category) {
 $category->setIsAnchor(1);
 if (!$category->save()) {
 return false;
 }
 return true;
 }
}

You can assign the index controller action to a menu item and then on click, you're able to anchor all categories quickly.