Array to string conversion

[eluser]Colin Williams[/eluser]
$key is a string, not an array. It is ALWAYS this way when you use the foreach construct in that way ($hash => value). The PHP error is very clear on that (it even points you to the exact line.. how handy).

You need to do $_FILES[$key] not $key['name']. $_FILES is the array you are looping through, afterall.