Goutte\Client::addPostFiles PHP Method

    protected function addPostFiles(array $files, array &$multipart, $arrayName = '')
    {
        if (empty($files)) {
            return;
        }
        foreach ($files as $name => $info) {
            if (!empty($arrayName)) {
                $name = $arrayName . '[' . $name . ']';
            }
            $file = ['name' => $name];
            if (is_array($info)) {
                if (isset($info['tmp_name'])) {
                    if ('' !== $info['tmp_name']) {
                        $file['contents'] = fopen($info['tmp_name'], 'r');
                        if (isset($info['name'])) {
                            $file['filename'] = $info['name'];
                        }
                    } else {
                        continue;
                    }
                } else {
                    $this->addPostFiles($info, $multipart, $name);
                    continue;
                }
            } else {
                $file['contents'] = fopen($info, 'r');
            }
            $multipart[] = $file;
        }
    }