[TYPO3-english] realurl: Empty path segments caused of a userFunc - What is the mistake?

[Hauke Hain]

Hi there,

for a long time I was not able to update realurl without getting empty path 
segments directly underneath my root page. This behaviour was introduced 
with realurl 1.10 and now with the current realurl version 1.11.2 ist works 
like with 1.9.4 again (no empty path segments are shown).

I used the new setting "emptySegmentValue" to find out if the empty segments 
are only not shown to the user. I was right: two empty segments right after 
the language parameter.

I found out that the emty segments are created by my own function, called 
here in the configuration of the preVars:
			array(
				'GETvar' => 'L',
				'userFunc' => 
'fileadmin/ext/class.tx_realurl_setLanguageParameter.php:&tx_realurl_setLanguageParameter->main',
				'valueMap' => array(
					'de' => '0',
					'en' => '1',
					'id' => '2',
				),
				'valueDefault' => 'de',
			),


The goal of the userFunc is to force a L parameter. If none is set the 
defaultValue (hardcoded) is set: 'de'
I want to do that to prevent dublicated content. (Previously googles 
Webmastertools warned me. Now, after a year of using this function the 
warnings are all gone.)  It works fine. Nevertheless it creates two empty 
path segments and I do not know why.

This is the code:

<?php

class tx_realurl_setLanguageParameter {

  function main($conf, $params) {
      if (!(($conf['value'] == de) || ($conf['origValue']=='de'))) {
          array_unshift($conf['pathParts'],'de',$conf['value']);
      }
  	return $conf['value'];
  }

}

?>

Help is appreciated. Thanks in advance for any tip / advice.

Kind regards,
Hauke