通过产品ID得到collection！！！

You can do as following for filtering products id 10 and 12

$products->addAttributeToFilter('entity_id',array('in'=>array(10,12)));

当然这种方式的上面，必须用 ->addAttributeToSelect();


下面这种方式比较实用的，如果想按照名字排序，那么使用方法：setOrder("name","asc");如果想按照ids中的排列的顺序，那么实用 $collection->getSelect()->order("find_in_set(e.entity_id,'".implode(',',$ids)."')"); 此为zf框架！

$idss = Mage::registry("idss");
$ids = explode(",",$idss);

//= array(3552,3553,3554,3555);
$collection = Mage::getModel('catalog/product')->getCollection()
->addAttributeToSelect('*')
->addAttributeToFilter('entity_id',$ids);
// ->setOrder("name", "asc");

$collection->getSelect()->order("find_in_set(e.entity_id,'".implode(',',$ids)."')");

$this->setCollection($collection);