mb_convert_encoding breaks code

[user1007017]

On this code

$messages = $mailbox->getMessages();

        foreach ($messages as $message) {
            // $message is instance of \Ddeboer\Imap\Message
            echo "\ngetting Message...";
            echo "\n".$message->getSubject();
        }

it breaks at a certain point...

getting Message...PHP Warning 'yii\base\ErrorException' with message 'mb_convert_encoding(): Unable to detect character encoding'
in /var/www/myhost.com/vendor/ddeboer/imap/src/Ddeboer/Imap/Message/Headers.php:20

// Decode subject, as it may be UTF-8 encoded

    if (isset($headers->subject)) {
        $subject = '';
        foreach (\imap_mime_header_decode($headers->subject) as $part) {
            // $part->charset can also be 'default', i.e. plain US-ASCII
            $charset = $part->charset == 'default' ? 'auto' : $part->charset;
            $subject .= \mb_convert_encoding($part->text, 'UTF-8', $charset);
        }
        $this->array['subject'] = $subject;
    }

[sergbass]

Also, mb_convert_encoding breaks when unsupported encoding occurs, for instance, windows-1257. And there's no way to avoid code break. I suggest to do 2 things:

1. add workarounds for known unsupported encodings, may be for this purpose separate class could be created;
2. add fallback for other unexpected unsupported encodings: when source encoding isn't in mb_list_encodings, set it to auto.

[spshe4]

@ddeboer
I got this error "mb_convert_encoding(): Unable to detect character encoding".
I use - "ddeboer/imap": "^0.5.2"

Can I fix something in my code so that I do not change the vendor files?