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 // added at phpBB 2.0.12 to fix a bug in PHP 4.3.10 (only supporting charlist in php >= 4.1.0)
 function phpbb_rtrim($str, $charlist = false)
  {
      if ($charlist === false)
      {
          return rtrim($str);
      }
      
      $php_version = explode('.', PHP_VERSION);
  
      // php version < 4.1.0
      if ((int) $php_version[0] < 4 || ((int) $php_version[0] == 4 && (int) $php_version[1] < 1))
      {
          while ($str{strlen($str)-1} == $charlist)
          {
              $str = substr($str, 0, strlen($str)-1);
          }
      }
      else
      {
          $str = rtrim($str, $charlist);
      }
  
      return $str;
 }