<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>TEST</title>
</head>
<body>
<form autocomplete="off" method="post" action="" enctype="multipart/form-data">
<input id="file" name="file[]" type="file" multiple="multiple">
<button name="submit" type="submit">Senden</button>
</form>
</body>
</html>
<?php
if(isset($_POST['submit'])){
for($i = 0; $i < count($_FILES['file']['name']);$i++){
$f_maxsize = 41943040;
$f_ext_allowed = array("stl", "STL", "jpeg", "png", "gif");
$f_name_2 = str_replace(" ","_", htmlspecialchars($_FILES["file"]['name'][$i]));
$f_size = $_FILES["file"]['size'][$i];
$f_tmp = $_FILES["file"]['tmp_name'][$i];
$f_error = $_FILES["file"]['error'][$i];
$f_ext = pathinfo($f_name_2, PATHINFO_EXTENSION);
move_uploaded_file($f_tmp, "to/upload/directory/" . $_FILES["file"]['name'][$i]);
}
}
?>