[Tickets #7305] broken php htmlspecialchars workaround needed

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Ticket URL: http://bugs.horde.org/ticket/7305
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  Ticket             | 7305
  Created By         | viljo.viitanen at helsinki.fi
  Summary            | broken php htmlspecialchars workaround needed
  Queue              | Horde Framework Packages
  Version            | FRAMEWORK_3
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
+New Attachment     | horde-text-filter-text2html-htmlspecialchars.txt
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viljo.viitanen at helsinki.fi (2008-09-08 10:56) wrote:

php htmlspecialchars function is stupid: When presented with invalid  
character data (e.g. raw latin1 'ä') and encoding is set to utf-8  
(also possibly other multibyte encodings), htmlspecialchars returns  
empty string (http://bugs.php.net/bug.php?id=43896).

horde should compensate for this, as not showing anything in an email  
when it contains broken utf-8 data is just plain wrong.

So, before using htmlspecialchars with charset utf-8, data should be  
checked that it is (at least) valid utf-8.

Not sure if this is horde or imp bug. In our local installation I  
fixed the problem with attached patch to  
lib/Horde/Text/Filter/text2html.php. We get a lot of messages with  
broken utf-8, unfortunately.