[Tickets #12827] PHP ERROR: array_intersect_key() when purging deleted items

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Ticket URL: http://bugs.horde.org/ticket/12827
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  Ticket             | 12827
  Created By         | aria at bsc.gwu.edu
  Summary            | PHP ERROR: array_intersect_key() when purging deleted
                     | items
  Queue              | IMP
  Version            | 6.1.5
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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aria at bsc.gwu.edu (2013-11-08 15:22) wrote:

Hi,

When I click purge deleted in a mailbox using any of the IMP  
interfaces, I get the following error message in the horde.log file:

WARN: HORDE [imp] PHP ERROR: array_intersect_key(): Argument #1 is not  
an array [pid 7485 on line 276 of  
"/usr/share/php5/PEAR/Horde/Imap/Client/Cache/Backend/Cache.php"]

I do NOT get the message if I just delete a message.  I do not use a  
trash mailbox.  Deleted messages remain in the mailbox and are just  
marked as deleted until purged.

This is similar to the dev discussion here:   
http://lists.horde.org/archives/dev/Week-of-Mon-20090413/023933.html

and a closed ticket here:  http://bugs.horde.org/ticket/12593

Please let me know how I can provide additional information to assist.
Thanks,
Aria