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$clref = $dbh->prepare ("SELECT color FROM item WHERE prod_id = ".$ref
+->{product_id});
               $clref->execute();
...
               while (my $color = $clref->fetchrow_hashref()) {
               push @{$ref->{color}}, $color->{color};
                  }

$clref = $dbh->prepare ("SELECT item_id, color FROM item WHERE prod_id
+ = ".$ref->{product_id});
               $clref->execute();
...
               while (my $color, $item_id = $clref->fetchrow_hashref()
+) {
               push @{$ref->{color}, {$ref->{item_id}}, $color->{color
+}, $item_id->{item_id};
                  }

sub add_item
{
...
    $cart_ref->{$item_id}->{qty} = $qty;    
                $cart_ref->{$item_id}->{color} = $color;    
}