How do you loop through $_FILES array?

Question

Here are the inputs I want to loop through

Main photo:   
Side photo 1: 

        

Answer 1

Maybe:

Main photo:   
Side photo 1: 
Side photo 2: 
Side photo 3: 

---

$i=1;
while (isset($_FILES['image'.$i])) {
    print_r($_FILES['image'.$i]);
    $i++;
}

If you have to loop through specific file fields.