i've been triyng to change the default result page of magento, i want the products grouped by categories, it don't include the subcategories but the products, the search criteria is the product name, so, i was triyng to use the defalt simple search of magento, untill now no result, maybe i have to override the search and make a new one, i know that with this i can get all the categories and its product collection,

$categories = Mage::getModel('catalog/category')
->getCollection()
->addAttributeToSelect('*');    

foreach($categories as $category)
{
    $array = $category->getParentIds();
    $children = explode(',',$category->getChildren());
    $products = $category->getProductCollection();
}

ama üretimi adına göre filtre gerekir, ben göstermek için secting ediyorum sonuç bu gibi

Category I  
    - Product I  
    - Product II  
Category II  
    - Product III  
    - Product IV