Programmatically add Magento products to categories

Question

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 mult

Answer 1

Well I ended up doing this with the API for some reason of laziness. This adds all the visible products into the category with ID 146:

 1, "connection_timeout" => 120));

  // Can be added in Magento-Admin -> Web Services with role set to admin

  $sess_id= $client->login('apiuser', 'apikey');

  // Get the product list through SOAP
  $filters = array('visibility' => '4', 'status' => '1');
  $all_products=$client->call($sess_id, 'product.list', array($filters));

  // Now chuck them into category 146

  foreach($all_products as $product)
  {  //var_dump($product);
      echo $product['sku']."\n";
      $doit=$client->call($sess_id, 'category.assignProduct', array('146', $product['sku']));
  }
?>