Recursively get Magento categories and children. Parameter to return only ID, and active only.

getChildCategories.php

    function getCategories(Mage_Catalog_Model_Category $ParentCategory, $id_only = false, $active = true) {
            $return = array();
            foreach(explode(',', $ParentCategory->getChildren()) as $categoryId) {
                    $Category = Mage::getModel('catalog/category')->load($categoryId);
                    if ($Category->getIsActive()) {
                        if ($id_only) {
                            $return[] = $categoryId;
                        } else {
                            $return[$categoryId] = array(
                                    'id'       => $Category->getId(),
                                    'name'     => $Category->getName(),
                                    'slug'     => $Category->getUrlKey(),
                                    'url'      => $Category->getUrl(),
                                    'active'   => $Category->getIsActive(),
                                    'children' => array()
                            );
                        
                        }
                    }
                    if($Category->getChildren()) {
                        if ($id_only) {
                            $return = array_merge($return, $this->getCategories($Category, $id_only, $active));
                        } else {
                            $return[$categoryId]['children'] = $this->getCategories($Category, $id_only, $active);
                        }
                    }
            }
            return $return;
    }