That line of code doesn't even exist anymore, both the activesync and 
imap libraries have seen lots of changes since FRAMEWORK_5_0 so it's 
likely that this doesn't even happen anymore (I can't reproduce here). 
If you see this while testing with master code then please reopen.

The framework libraries will not be seeing any more bug fixes on the 
FRAMEWORK_5_0 branch.

Hi Michael,

why is

2013-05-14T10:42:16+02:00 WARN: HORDE [horde] PHP ERROR:
  array_combine() [<a
  href='function.array-combine'>function.array-combine</a>]: Both
  parameters should have an equal number of elements [pid 3162 on line
  3499 of
  "/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php"

not a bug?

that problem turned out to be a PEBKAC:
It was only syncing messages of the last seven days, so the folders 
appeared empty.

Additionally the PHP error message for the empty folder fooled me...

I think I got it:
The PHP error message is only shown if the requested folder is empty.

That still leaves the problem that no messages are synced anymore.
Contacts f.e. work fine.

Ok, I've added this debug code:

--- a/framework/Imap_Client/lib/Horde/Imap/Client/Base.php
+++ b/framework/Imap_Client/lib/Horde/Imap/Client/Base.php
@@ -3496,6 +3496,15 @@ abstract class Horde_Imap_Client_Base 
implements Serializable
                  return $res['match'];
              }

+            $debug_str = sprintf("TOMJ: ids->ids: %s, 
res['match]->ids: %s", print_r($ids->ids, true), 
print_r($res['match']->ids, true));
+            $e = new LogicException('TOMJ2: Get me a nice stack trace');
+            $debug_str2 = $e->getTraceAsString();
+            $debug_str3 = sprintf("TOM3: convert: $convert, mailbox: 
%s", print_r($mailbox, true));
+
+            Horde::logMessage($debug_str);
+            Horde::logMessage($debug_str2);
+            Horde::logMessage($debug_str3);
+
              $map->update(array_combine($ids->ids, $res['match']->ids));
          }


Resulting output:
[pid 17730 on line 3506 of 
"/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php"]
2013-05-14T11:24:59+02:00 INFO: HORDE [horde] TOMJ: ids->ids: Array
(
     [0] => 0
     [1] => 1
)
, res['match]->ids: Array
(
)
  [pid 17730 on line 3504 of 
"/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php"]
2013-05-14T11:24:59+02:00 INFO: HORDE [horde] #0 
/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php(2596): Horde_Imap_Client_Base->resolveIds(Object(Horde_Imap_Client_Mailbox), Object(Horde_Imap_Client_Ids), 
1)
#1 
/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php(2481): Horde_Imap_Client_Base->_fetchWrapper(Object(Horde_Imap_Client_Mailbox), Object(Horde_Imap_Client_Fetch_Query), 
Array)
#2 
/datastore/DEVEL/horde/framework/ActiveSync/lib/Horde/ActiveSync/Imap/Adapter.php(328): Horde_Imap_Client_Base->fetch(Object(Horde_Imap_Client_Mailbox), Object(Horde_Imap_Client_Fetch_Query), 
Array)
#3 
/datastore/DEVEL/horde/framework/Core/lib/Horde/Core/ActiveSync/Driver.php(584): Horde_ActiveSync_Imap_Adapter->getMessageChanges(Object(Horde_ActiveSync_Folder_Imap), 
Array)
#4 
/datastore/DEVEL/horde/framework/ActiveSync/lib/Horde/ActiveSync/State/Sql.php(807): Horde_Core_ActiveSync_Driver->getServerChanges(Object(Horde_ActiveSync_Folder_Imap), 1368522038, 1368523499, 1368264299, 
false)
#5 
/datastore/DEVEL/horde/framework/ActiveSync/lib/Horde/ActiveSync/Sync.php(137): 
Horde_ActiveSync_State_Sql->getChanges(Array)
#6 
/datastore/DEVEL/horde/framework/ActiveSync/lib/Horde/ActiveSync/Request/Sync.php(621): Horde_ActiveSync_Sync->init(Object(Horde_ActiveSync_State_Sql), Object(Horde_ActiveSync_Connector_Exporter), 
Array)
#7 
/datastore/DEVEL/horde/framework/ActiveSync/lib/Horde/ActiveSync/Request/Base.php(218): 
Horde_ActiveSync_Request_Sync->_handle()
#8 
/datastore/DEVEL/horde/framework/ActiveSync/lib/Horde/ActiveSync.php(647): 
Horde_ActiveSync_Request_Base->handle()
#9 
/datastore/DEVEL/horde/framework/Rpc/lib/Horde/Rpc/ActiveSync.php(141): 
Horde_ActiveSync->handleRequest('Sync', '356938030416912')
#10 /datastore/DEVEL/horde/horde/rpc.php(156): 
Horde_Rpc_ActiveSync->getResponse(NULL)
#11 {main} [pid 17730 on line 3505 of 
"/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php"]
2013-05-14T11:24:59+02:00 INFO: HORDE [horde] TOM3: convert: 2, 
mailbox: Horde_Imap_Client_Mailbox Object
(
     [_utf7imap:protected] => 1
     [_utf8:protected] => INBOX/Sufi
)
  [pid 17730 on line 3506 of 
"/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php"]
2013-05-14T11:24:59+02:00 WARN: HORDE [horde] PHP ERROR: 
array_combine() [<a 
href='function.array-combine'>function.array-combine</a>]: Both 
parameters should have an equal number of elements [pid 17730 on line 
3508 of 
"/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php"]

For the record:
I've cleared all horde caches and ActiveSync states. The backtrace is 
from my local tree running the backported bug #12224 fix, but as I 
said, it also failed with the vanilla commit mentioned earlier.

ActiveSync log from a Nokia N900. The iPad 4 shows the same behavior 
(does not show any messages, but displays the folder list).

Hi,

I just discovered that ActiveSync no longer syncs my test box. This is 
what I get in the logs:
2013-05-14T10:42:16+02:00 WARN: HORDE [horde] PHP ERROR: 
array_combine() [<a 
href='function.array-combine'>function.array-combine</a>]: Both 
parameters should have an equal number of elements [pid 3162 on line 
3499 of 
"/datastore/DEVEL/horde/framework/Imap_Client/lib/Horde/Imap/Client/Base.php"

I'm not sure if it's related to upgrading to origin/FRAMEWORK_5_0 
HEAD, I've also tried a "vanilla" 
1b4fc14eeeab4a98e92538143eef3abaa9ad7dd5 commit without any local 
changes.

I'm pretty sure it was working last week, dimp shows the messages just 
fine. I'll try to add some debug logging to the mentioned PHP error 
line.

Thomas