Both ways work. However, last I checked the $item1, $item2, $item3, $item4 way requires the items to be turned in with that specific order. So let's say something like:
if($item1 == 14985 && $item2 == 14986 && $item3 == 14566)
The first item in the trade window would have to be 14985, followed by 14986, and then finally 14566. This was a good while ago, and one of the reasons I started using $itemcount instead...so it may have been fixed.
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