[Tickets #14459] headers already sent

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Ticket URL: https://bugs.horde.org/ticket/14459
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  Ticket             | 14459
  Created By         | anton.kornexl at uni-passau.de
  Summary            | headers already sent
  Queue              | Horde Framework Packages
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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anton.kornexl at uni-passau.de (2016-09-06 13:26) wrote:

After Ugrade to Ubuntu 16.04 (with PHP 7.0.8-0ubuntu0.16.04.2)
(Horde (horde) 5.2.11  and  Mail (imp) 6.2.15)
my syslog file is full of the following message:

HORDE: [horde] PHP ERROR: Cannot modify header information - headers  
already sent [pid xxxx on line 0 of "Unknown"]

if i set
$conf['compress_pages'] = false;
in horde/config/config.php
the errors are gone.