Magento: how to merge two product collections into one?

Question

if i have two product collections is there a way to merge them into one?

for example (my final intent isn\'t to actually just get a collection of 2 cats, this is jus

Answer 1

you can filter your collection directly without using 2.

$products = Mage::getModel('catalog/product');
$_collection = $products->getCollection();
->addCategoryFilter(2)
->load();

or try using 'addItem' to add your results to a collection. See also in Magento wiki