[UnrealEd]

just store all the names of the input fields in an array, or if they have a logical name, you might wonna browse over them using a for loop.
either this:

PHP Code:

$fields = array('field_name1', 'field_name2', 'etc...');

for($i=0; $i<sizeof($fields); $i++){

  //do something with the input

} 

or this:

PHP Code:

for($i=0; $i<$number_of_fields; $i++){

  $input = $_FILES['field'.$i];

  //do something with the input

} 

Hope this helps you,
UnrealEd