Magento – Programmatically add Magento products to categories

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I am using Magento 1.4.0.1.
I have over 21000 simple products, each entered into a single category.
There are hundreds of categories in my site.
Some products belong in multiple categories.
Is there some way for me to programmatically add products into multiple categories?

Best Answer

In PHP code you can put them into the category while you are importing them.

Say you have a product called $product and a category ID called $category_id

You can set the categories which a product belongs to by doing the following

$categories = array($category_id);
$product->setCategoryIds($categories);
$product->save();

If the product already has categories and you'd like to add one more then you can use getCategoryIds() like this:

$categories = $product->getCategoryIds();
$categories[] = $categoryId;
$product->setCategoryIds($categories);
$product->save();

Or, as mentioned by Joshua Peck in the comments, you can use the category_api model to add or remove a product from a category without affecting it's current category assignments:

Mage::getSingleton('catalog/category_api')
  ->assignProduct($category->getId(),$p‌​roduct->getId());

Mage::getSingleton('catalog/category_api')
  ->removeProduct($category->getId(),$p‌​roduct->getId());
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