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geoffs3310 February 2016

Curl not posting file in PHP

I am using the Brightcove API to upload video files from my server to my Brightcove account. I had it working with the following code:

$fields = array(
    'json' => json_encode( array(
        'method' => "create_video",
        'params' => array(
            'video' => array(
                'name' => $video->submission_by_name.' '.time(),
                'shortDescription' => $video->submission_question_1
            "token" => $this->config->item('brightcove_write_token'),
            "encode_to" => "MP4",
            "create_multiple_renditions" => "True"
    'file' => new CURLFile(FCPATH.'assets/uploads/submitted/'.$video->filename)

//open connection
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL, $this->config->item('brightcove_write_endpoint'));
curl_setopt($ch,CURLOPT_POST, count($fields));
curl_setopt($ch,CURLOPT_POSTFIELDS, $fields);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

//execute post
$result = json_decode(curl_exec($ch));

This was working locally however the live server is running PHP 5.3 so I can't use new CURLFile()

How would I achieve sending the file in a way that will work with PHP 5.3.3? I tried changing the file filed to use the @ syntax instead like so:

'file' => '@' . FCPATH.'assets/uploads/submitted/'.$video->filename

but that doesn't seem to work, the API returns an error saying:

FilestreamRequiredError: upload requires a multipart/form-data POST with a valid filestream

So it looks like the file isn't being posted through.

I've also tried copying the curl_file_create function like so:

private function custom_curl_file_create($filename, $mimetype = '', $p        


geoffs3310 February 2016

There are "@" issue on multipart POST requests apparently. I found the following information which solved the problem:

Solution for PHP 5.5 or later:
- Use CURLFile instead of "@".

Solution for PHP 5.4 or earlier:
- Build up multipart content body by youself.
- Change "Content-Type" header by yourself.

The following snippet will help you :D


* For safe multipart POST request for PHP5.3 ~ PHP 5.4.
* @param resource $ch cURL resource
* @param array $assoc "name => value"
* @param array $files "name => path"
* @return bool
function curl_custom_postfields($ch, array $assoc = array(), array $files = array()) {

    // invalid characters for "name" and "filename"
    static $disallow = array("\0", "\"", "\r", "\n");

    // build normal parameters
    foreach ($assoc as $k => $v) {
        $k = str_replace($disallow, "_", $k);
        $body[] = implode("\r\n", array(
            "Content-Disposition: form-data; name=\"{$k}\"",

    // build file parameters
    foreach ($files as $k => $v) {
        switch (true) {
            case false === $v = realpath(filter_var($v)):
            case !is_file($v):
            case !is_readable($v):
                continue; // or return false, throw new InvalidArgumentException
        $data = file_get_contents($v);
        $v = call_user_func("end", explode(DIRECTORY_SEPARATOR, $v));
        $k = str_replace($disallow, "_", $k);
        $v = str_replace($disallow, "_", $v);
        $body[] = implode("\r\n", array(
            "Content-Disposition: form-data; name=\"{$k}\"; filename=\"{$v}\"",
            "Content-Type: application/octet-stream",

    // generate safe boundary 
    do {
        $boundary = "---------------------" . md5(mt_rand() . microtime());
    } while (preg_grep("/{$boundary}/", $body));

    // add boundar 

Post Status

Asked in February 2016
Viewed 1,929 times
Voted 14
Answered 1 times


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