  function ngettext($single, $plural, $number) {
    if ($this->short_circuit) {
      if ($number != 1)
        return $plural;
      else
        return $single;
    }

    // find out the appropriate form
    $select = $this->select_string($number);

    // this should contains all strings separated by NULLs
    $key = $single . chr(0) . $plural;


    if ($this->enable_cache) {
      if (! array_key_exists($key, $this->cache_translations)) {
        return ($number != 1) ? $plural : $single;
      } else {
        $result = $this->cache_translations[$key];
        $list = explode(chr(0), $result);
        return $list[$select];
      }
    } else {
      $num = $this->find_string($key);
      if ($num == -1) {
        return ($number != 1) ? $plural : $single;
      } else {
        $result = $this->get_translation_string($num);
        $list = explode(chr(0), $result);
        return $list[$select];
      }
    }
  }
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.