It don't work, now with:

PHP Version: 5.2.1RC3-dev (latest)
c-client: imap-2006d (latest)

it reproduces the same behavior. The 'test' folder appears without its children folders.

Greetings.

<?php
// I use Cyrus 2.2.10
$imapconn = imap_open("{localhost:143}INBOX","testuser","testuser"); 
$mailboxes = imap_getmailboxes($imapconn, "{localhost:143/imap/notls}", "%");
$errors = imap_errors();

var_dump($mailboxes);
var_dump($errors);
?>


And this is the result:
array(4) {
  [0]=>
  object(stdClass)#1 (3) {
    ["name"]=>
    string(32) "{localhost:1143/imap/notls}INBOX"
    ["attributes"]=>
    int(1)
    ["delimiter"]=>
    string(1) "."
  }
  [1]=>
  object(stdClass)#2 (3) {
    ["name"]=>
    string(31) "{localhost:1143/imap/notls}test"
    ["attributes"]=>
    int(64)
    ["delimiter"]=>
    string(1) "."
  }
  [2]=>
  object(stdClass)#3 (3) {
    ["name"]=>
    string(38) "{localhost:1143/imap/notls}test second"
    ["attributes"]=>
    int(32)
    ["delimiter"]=>
    string(1) "."
  }
  [3]=>
  object(stdClass)#4 (3) {
    ["name"]=>
    string(31) "{localhost:1143/imap/notls}test"
    ["attributes"]=>
    int(34)
    ["delimiter"]=>
    string(1) "."
  }
}
bool(false)


Like you can see, the 'test' folder appears two times and the first time it shows a 64 attributes value, but the test folder has the childrens:

"test.aaa" and "test.bbb"

Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows (zip):
 
  http://snaps.php.net/win32/php5.2-win32-latest.zip

For Windows (installer):

  http://snaps.php.net/win32/php5.2-win32-installer-latest.msi

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".