mb_decode_mimeheader() fails on emails with multiple references

[petar-djuric]

Describe the bug
I'm using laravel however this seems to be a php-imap issue so I will post it here. The connection used was gmail with the settings described in the wiki (app-password)

mb_decode_mimeheader() expects parameter 1 to be string, array given
on src/Header.php  private function decode($value)
on line 388

I have traced the issue back to 'References:' raw header

On normal emails, there is only one reference but some emails can have a hierarchy of emails in them so it picks up multiple references. This causes the public function rfc822_parse_headers($raw_headers) on line 171 to parse 'References:' as an array rather than a string.

To Reproduce
Steps to reproduce the behavior:

1. use gmail connection (app password)

$client->connect();
       return $client->getFolders('folder name')->messages()->all()->get();

3. emails with multiple references will fail on mb_decode_mimeheader()

Desktop / Server (please complete the following information):

• OS: macos 10.15.7 (19H2)
• PHP: 7.4.13

Additional context
This only happens when an email contains multiple 'References:' on a single reference the behaviour is normal with out any issues.

[lutchin]

I have the same problem.
solution to the problem:

`\vendor\webklex\php-imap\src\Header.php 145

  if (property_exists($header, 'references')) {
        !is_array($header->references)?:$header->references=$header->references[1];
        $this->attributes["references"] = $this->decode($header->references);
    }`

[Webklex]

Hi @lutchin ,
thanks for your report 👍

Please update your php-imap dependency to v2.2.5.

Best regards,