how tao have more then one user upload image with code below

Question

this code is limiting me from having more the one user upload an image

$ausgabe = '';
if (isset($_POST['submit']) && $_POST['submit']=="Senden") {
    $ausgabe .= 'Upload compelte:<br>';
    if (isset($_FILES['thefile']['tmp_name'])  && strpos($_FILES['thefile']['type'], 'image') !== false) {
        $size=getimagesize($_FILES['thefile']['tmp_name']);
        if ($size[2] == 1
        || $size[2] == 2
        || $size[2] == 3
        || $size[2] == 4) {
                

Answer 1

I realized that the problem was caused by a mistake I did.

The issue ended up being in the <form> where name="max_file_size... needed to be replaced as name="file_size...