Actually, I want to load the product collection except for some products. I have the product ids that I don't want in the collection. For example, the product ids that I don't want in the product collection is like
$productIds = array(10,20,30); How can I do this?
You can use this code.
$productIds = array(10,20,30); $collection = Mage::getModel('catalog/product')->getCollection() ->addFieldToFilter('entity_id', array('nin' => $productIds)); Use addIdFilter() with the second parameter $exclude set to true, to invert the filter:
$productCollection->addIdFilter($productIds, true) 
some time not in not work without addFieldToSelect I will always use this
$productIds = array(10,20,30) $collection = Mage::getModel('catalog/product')->getCollection() ->addFieldToSelect('entity_id') ->addFieldToFilter('entity_id', array('nin' => $productIds)); 