I'm using cURL to transfer image files from one server to another using PHP. This is my cURL code:

```
// Transfer the original image and thumbnail to our storage server
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_VERBOSE, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_URL, 'http://' . $server_data['hostname'] . '.localhost/transfer.php');
curl_setopt($ch, CURLOPT_POST, true);
$post = array(
    'upload[]' => '@' . $tmp_uploads . $filename,
    'upload[]' => '@' . $tmp_uploads . $thumbname,
    'salt' => 'q8;EmT(Vx*Aa`fkHX:up^WD^^b#<Lm:Q'
);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post); 
$resp = curl_exec($ch);

```

This is the code in transfer.php on the server I'm uploading to:

```
if($_FILES && $_POST['salt'] == 'q8;EmT(Vx*Aa`fkHX:up^WD^^b#<Lm:Q')
{
    // Save the files
    foreach($_FILES['upload']['error'] as $key => $error)
    {
        if ($error == UPLOAD_ERR_OK)
        {
            move_uploaded_file($_FILES['upload']['tmp_name'][$key], $_FILES['upload']['name'][$key]);
        }
    }
}

```

All seems to work, apart from one small logic error. Only one file is getting saved on the server I'm transferring to. This is probably because I'm calling both images `upload[]` in my post fields array, but I don't know how else to do it. I'm trying to mimic doing this:

```
<input type="file" name="upload[]" />
<input type="file" name="upload[]" />

```

Anyone know how I can get this to work? Thanks!