在php中处理文件上传的大量错误

Question

I'm using this code to process uploaded files:

mkdir("files/" . $id, 0700);
$path = "files/" . $id;
$count = 0;

if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST")
    {
        foreach($_FILES['attachments']['name'] as $f => $name)
        {
            if($_FILES['attachments']['error'][$f] == 4)
            {
                continue;
            }
            if($_FILES['attachments']['error'][$f] == 0)
            {
                if(move_uploaded_file($_FILES["attachments"]["tmp_name"][$f], $path.$name))
                {
                    $count++;
                }
            }
        }
    }

$id is a random number taken from the database. Besides, I'm using this markup:

<input type="file" id="attachments" name="attachments[]" multiple="multiple" accept="*">

While the exact same code had worked brilliantly before, it now throws numbers of errors I can't really deduce:

1: mkdir(): File exists in ... on line ... (<-- now, it doesn't for granted!)
2: Undefined index: attachments in ... on line ... (well, it's defined also using form method post!)
3: Invalid argument supplied for foreach() in ... on line ... (which is quite clear as the above stated errors do prevent the foreach from doing its job correctly)

Yes, I made sure that I'm actually using POST. I also tried changing the file input's name from attachments to any other, however, scenario remains the same.

Adding enctype="multipart/form-data" has done it.

Answer 1

1] Check for the folder rights 0777. Weather you are able to create directory or not

2] After posting form. Make sure your form has enctype = multipart/form-data tag. In you file please check with

echo "<pre>";
print_r($_FILES);
exit;

If you are getting any data or not? If getting data then move ahead.