Output multiple field name results

I've got the following input fields:

<input name="file1" type="file">
<input name="file2" type="file">
<input name="files[]" type="file" multiple>

I'm trying to figure out the best way to check which of the fields above are not empty and perform some DB action with the ones that have files in them.

I can check them each one manually like this but I am wondering if there is a better way to do this:

if(!empty($_FILES['file1']['name']) {
    // Perform checks/etc for file1
}

if(!empty($_FILES['file2']['name']) {
    // Perform checks/etc for file2
}

if(!empty($_FILES['files']['name'][0]) {
    // Loop the array, perform checks/etc for each one
}