[TYPO3-german] t3 erweiterung problem bei der anleitung form_extension_tut

[Christian Hensel]

Hallo Liste, im form_extension_tut findet man folgenden codeschnipsel: 
(vorletzte seite)

if(isset'.$this->piVars{submit_button']){
    t3lib_div::debug($this->piVars);
  }

ich habe ihn eingebaut, bekomme jedoch den folgenden syntaxfehler:

Parse error: parse error, expecting `'('' in 
/home/www/web0/html/wise/typo3conf/ext/wiseev/pi1/class.tx_wiseev_pi1.php on 
line 57

, kann mir jemand helfen? wo liegt der Fehler? Ist im Tutorial ein Fehler.. 
oder mache ich einen?


komplettes skript:
<?php
/***************************************************************
*  Copyright notice
*
*  (c) 2006 Christian Hensel <chensel at visiopro.de>
*  All rights reserved
*
*  This script is part of the TYPO3 project. The TYPO3 project is
*  free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*
*  This script is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/

require_once(PATH_tslib.'class.tslib_pibase.php');


/**
 * Plugin 'listofvolunteers' for the 'wiseev' extension.
 *
 * @author Christian Hensel <chensel at visiopro.de>
 * @package TYPO3
 * @subpackage tx_wiseev
 */
class tx_wiseev_pi1 extends tslib_pibase {
 var $prefixId = 'tx_wiseev_pi1';  // Same as class name
 var $scriptRelPath = 'pi1/class.tx_wiseev_pi1.php'; // Path to this script 
relative to the extension dir.
 var $extKey = 'wiseev'; // The extension key.
 var $pi_checkCHash = TRUE;

 /**
  * The main method of the PlugIn
  *
  * @param string  $content: The PlugIn content
  * @param array  $conf: The PlugIn configuration
  * @return The content that is displayed on the website
  */
 function main($content,$conf) {
  $this->conf=$conf;
  $this->pi_setPiVarDefaults();
  $this->pi_loadLL();
  /**if(isset'.$this->piVars{submit_button']) {
   // WHAT TO DO if content is submitted
   t3lib_div::debug($this->piVars);
  }
  else {  **/
  if(isset'.$this->piVars{submit_button']){
    t3lib_div::debug($this->piVars);
  }
  $content='
   <h3>This is a form:</h3>
   <form action="'.$this->pi_getPageLink($GLOBALS['TSFE']->id).'" 
method="POST">
    <input type="hidden" name="no_cache" value="1">
    <input type="text" name="'.$this->prefixId.'[DATA][einsatzland]">
    <textarea name="'.$this->prefixId.'[DATA][4_1_projekt]"> </textarea>
    <input type="submit" name="'.$this->prefixId.'[submit_button]" 
value="Absenden">
   </form>
   <br />
   <p>You can click here to '.$this->pi_linkToPage('get to this page 
again',$GLOBALS['TSFE']->id).'</p>

   <b>Debug (This extension is in Development):</b><br />
   '.$this->pi_getPageLink($GLOBALS['TSFE']->id).' //link to current page

   <br />(c) Christian Hensel
  ';

  return $this->pi_wrapInBaseClass($content);
 }
}



if (defined('TYPO3_MODE') && 
$TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['ext/wiseev/pi1/class.tx_wiseev_pi1.php']) 
{
 include_once($TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['ext/wiseev/pi1/class.tx_wiseev_pi1.php']);}Vielen DankChristian