if(isset($_POST['submit'])){
// Count total files
$countfiles = count($_FILES['file']['name']);

// Looping all files
for($i=0;$i<$countfiles;$i++){
$filename = $_FILES['file']['name'][$i];

// Upload file
move_uploaded_file($_FILES['file']['tmp_name'][$i],'upload/'.$filename);

}
}
?>