private function createElement($name, StreamInterface $stream, $filename, array $headers)
{
// Set a default content-disposition header if one was no provided
$disposition = $this->getHeader($headers, 'content-disposition');
if (!$disposition) {
$headers['Content-Disposition'] = $filename === '0' || $filename ? sprintf('form-data; name="%s"; filename="%s"', $name, basename($filename)) : "form-data; name=\"{$name}\"";
}
// Set a default content-length header if one was no provided
$length = $this->getHeader($headers, 'content-length');
if (!$length) {
if ($length = $stream->getSize()) {
$headers['Content-Length'] = (string) $length;
}
}
// Set a default Content-Type if one was not supplied
$type = $this->getHeader($headers, 'content-type');
if (!$type && ($filename === '0' || $filename)) {
if ($type = mimetype_from_filename($filename)) {
$headers['Content-Type'] = $type;
}
}
return [$stream, $headers];
}