Description:
------------
This bug is affecting 7.2.11 and 7.3.0RC4

If calling imap_status() on a series of mailboxes, if the mailbox has no emails in it, imap_status() returns the previous result.

I have also tried calling imap_gc() before calling imap_status() and this didn't help either.

Test script:
---------------
$folders = [
    '{localhost:143}INBOX',  // Has 3 emails, 2 unseen
    '{localhost:143}INBOX/NoEmails',  //  Has no emails
];

$connection = imap_open('{localhost:143}INBOX/NoEmails', 'user', 'password);

foreach ($folders as $folder) {
    $status = imap_status($connection, $folder, SA_ALL);  // Changing options has no effect on the result

    print_r($status);  // Always returns the results for INBOX
}

Expected result:
----------------
stdClass Object
(
    [flags] => 31
    [messages] => 3
    [recent] => 0
    [unseen] => 2
    [uidnext] => 1108
    [uidvalidity] => 1527875182
)

stdClass Object
(
    [flags] => 31
    [messages] => 0
    [recent] => 0
    [unseen] => 0
    [uidnext] => 1108
    [uidvalidity] => 1527875182
)

Actual result:
--------------
stdClass Object
(
    [flags] => 31
    [messages] => 3
    [recent] => 0
    [unseen] => 2
    [uidnext] => 1108
    [uidvalidity] => 1527875182
)

stdClass Object
(
    [flags] => 31
    [messages] => 3
    [recent] => 0
    [unseen] => 2
    [uidnext] => 1108
    [uidvalidity] => 1527875182
)