if you use a mutliple uploads form (say 3 uploads) and you wil only fill in upload2 in the browser
the arrays *, *_name and *_size has 3 items and *_type will have one :

var_dumps after doing the above: 

// *
array(3) {
  [0]=>
  string(4) "none"
  [1]=>
  string(14) "/tmp/phpCiTyX5"
  [2]=>
  string(4) "none"
}

// *_name
array(3) {
  [0]=>
  string(0) ""
  [1]=>
  string(10) "Status.htm"
  [2]=>
  string(0) ""
}

// *_size
array(3) {
  [0]=>
  int(0)
  [1]=>
  int(1845)
  [2]=>
  int(0)
}

// *_type
array(1) {
  [0]=>
  string(9) "text/html"
}

this should be:

// *_size
array(3) {
  [0]=>
  string(0) ""
  [1]=>
  string(9) "text/html"
  [2]=>
  string(0) ""
}

Greetz,

Wico