multi category to products

[elizondo82]

I add on data _category => "car/home/shop", that is working fine.
but when I put an array example:

_category => array("car/home/shop","car/home/shop/aaa"),
and

$cat[] = array('sku'=> 1005,'_category'=>'car/home/shop');
$cat[] = array('sku'=> '','_category'=>'car/home/shop/ddd');
$cay[] = array('sku'=> '','_category'=>'car/home/shop/ppp');
$import->processProductImport($cat);

not working. Somebody know what is wrong or a soluction?