Description:
------------
IMAP works in PHP 7.4.x and earlier. In PHP 8.0.0, it breaks by flooding the error log with this: "imap_msgno(): Bad message number"

I have asked about it here: https://stackoverflow.com/questions/65031547/what-has-changed-in-php-8-which-causes-imap-msgno-to-claim-bad-message-number

I was told to report this here.

Test script:
---------------
$message_number_array = imap_search($specific_mailbox_connection, 'ALL', SE_UID);

if (count($message_number_array))
{
    foreach ($message_number_array as $message_number)
    {
        $header_info = imap_headerinfo($specific_mailbox_connection, imap_msgno($specific_mailbox_connection, $message_number));
[...]