retrieve all children categories given a category id

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本文介绍如何在Magento中使用Mage_Catalog_Model_Category类获取子类别，包括直接获取子类别ID列表和获取子类别实例数组的方法。

I think the class Mage_Catalog_Model_Category already includes the function you are searching. It is called getChildren:

public function retrieveAllChilds($id = null, $childs = null) {
    $category = Mage::getModel('catalog/category')->load($id);
    return $category->getChildren();
}

The function getChildren returns children IDs comma-separated, getChildrenCategoriesreturns an array of Mage_Catalog_Model_Category instances.

If you want to get the children categories recursively, you can use:

public function retrieveAllChilds($id = null, $childs = null) {
    $category = Mage::getModel('catalog/category')->load($id);
    return $category->getResource()->getChildren($category, true);
}