PHP curl file upload :: weird curl behaviour when form name is an integer

Question

I have problem with curl file upload using PHP when form name of input file is an integer: <input type="file" name="1">

I have following array that I put in CURLOPT_POSTFIELDS to get multipart/form-data:

$array = array(
    "MAX_FILE_SIZE" => 80000,
    "1" => '@'.$cfg['lpath'].'logos/'.domain($projekt['adres']).'.jpg;type=image/jpeg',
    "2" => '@'.($cfg['lpath']==''?'/dev/null':'NUL:').';filename=',
    "3" => '@'.($cfg['lpath']==''?'/dev/null':'NUL:').';filename=',
    "send" => 'send it'
);

I send it to server and var_dump($_POST, $_FILES) is as follow:

$_POST:

array(2) {
  ["MAX_FILE_SIZE"]=>
  string(5) "80000"
  ["send"]=>
  string(7) "send it"
}

$_FILES:

array(1) {
  ["MAX_FILE_SIZE"]=>
  array(5) {
    ["name"]=>
    string(0) ""
    ["type"]=>
    string(0) ""
    ["tmp_name"]=>
    string(0) ""
   ["error"]=>
    int(4)
    ["size"]=>
    int(0)
  }
}

When I change array keys to letters it works as expected:

$_FILES:

array(3) {
  ["a"]=>
  array(5) {
    ["name"]=>
    string(16) "filename.jpg"
    ["type"]=>
    string(10) "image/jpeg"
    ["tmp_name"]=>
    string(14) "/tmp/phpRZMiRA"
    ["error"]=>
    int(0)
    ["size"]=>
    int(6567)
  }
  ["b"]=>
  array(5) {
    ["name"]=>
    string(0) ""
    ["type"]=>
    string(0) ""
    ["tmp_name"]=>
    string(0) ""
    ["error"]=>
    int(4)
    ["size"]=>
    int(0)
  }
  ["c"]=>
  array(5) {
    ["name"]=>
    string(0) ""
    ["type"]=>
    string(0) ""
    ["tmp_name"]=>
    string(0) ""
    ["error"]=>
    int(4)
    ["size"]=>
    int(0)
  }
}

Is it a bug? Is it possible to send such an array using curl?

My PHP Version is 5.3.25 Curl version 7.30.0

Community · Accepted Answer · 2017-05-23 10:25:48Z

0

Name tokens in HTML have to follow a certain restriction.

6.2 SGML basic types

...

    ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

Source: http://www.w3.org/TR/html4/types.html#type-cdata

One solution could be to prefix your inputs with say "data-"<number> and your post would work as expected.

There are plenty of questions on StackOverflow that address this issue. Here is one: valid value for name attribute in html

edited May 23, 2017 at 10:25

CommunityBot

11 silver badge

answered Oct 29, 2013 at 13:09

Coreus

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2 Comments

Robert Over a year ago

I don't have access to this HTML form and I need to send data via curl. Maybe using php cocket would do the trick.

Coreus Over a year ago

Would it be possible to try and contact the author/responsible and ask for a rather simple change? Working off plain wrong convention is a hack at best.

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