return $str;

  }

  function pparse($target, $handle, $append = false) {

    print $this->parse($target, $handle, $append);

    return false;

  }

  /* public: get_vars()

   */

  function get_vars() {

    reset($this->varkeys);

    while(list($k, $v) = each($this->varkeys)) {

      $result[$k] = $this->varvals[$k];

    }

    return $result;

  }

  /* public: get_var(string varname)

   * varname: name of variable.

   *

   * public: get_var(array varname)

   * varname: array of variable names

   */

  function get_var($varname) {

    if (!is_array($varname)) {

      return $this->varvals[$varname];

    } else {

      reset($varname);

      while(list($k, $v) = each($varname)) {

        $result[$k] = $this->varvals[$k];

      }

      return $result;

    }

  }

  /* public: get_undefined($handle)

   * handle: handle of a template.

   */

  function get_undefined($handle) {

    if (!$this->loadfile($handle)) {

      $this->halt("get_undefined: unable to load $handle.");

      return false;

    }

    preg_match_all("/{([^}]+)}/", $this->get_var($handle), $m);

    $m = $m[1];

    if (!is_array($m))

      return false;

    reset($m);

    while(list($k, $v) = each($m)) {

      if (!isset($this->varkeys[$v]))

        $result[$v] = $v;

    }
   

    if (count($result))

      return $result;

    else

      return false;

  }

  /* public: finish(string $str)

   * str: string to finish.

   */

  function finish($str) {

    switch ($this->unknowns) {

      case "keep":

      break;

      case "remove":

        $str = preg_replace('/{[^ \t\r\n}]+}/', "", $str);

      break;

      case "comment":

        $str = preg_replace('/{([^ \t\r\n}]+)}/', "<!-- Template $handle: Variable \1 undefined -->", $str);

      break;

    }

    return $str;

  }

  /* public: p(string $varname)

   * varname: name of variable to print.

   */

  function p($varname) {

    print $this->finish($this->get_var($varname));

  }

  function get($varname) {

    return $this->finish($this->get_var($varname));

  }

  /********************************/

  /* private: filename($filename)

   * filename: name to be completed.

   */

  function filename($filename) {

    if (substr($filename, 0, 1) != "/") {

      $filename = $this->root."/".$filename;

    }

    if (!file_exists($filename))

      $this->halt("filename: file $filename does not exist.");
    return $filename;

  }

  /* private: varname($varname)

   * varname: name of a replacement variable to be protected.

   */

  function varname($varname) {

    return preg_quote("{".$varname."}");

  }

  /* private: loadfile(string $handle)

   * handle:  load file defined by handle, if it is not loaded yet.

   */

  function loadfile($handle) {

    if (isset($this->varkeys[$handle]) and !empty($this->varvals[$handle]))

      return true;

    if (!isset($this->file[$handle])) {

      $this->halt("loadfile: $handle is not a valid handle.");

      return false;

    }

    $filename = $this->file[$handle];

    $str = implode("", @file($filename));

    if (empty($str)) {

      $this->halt("loadfile: While loading $handle, $filename does not exist or is empty.");

      return false;

    }

    $str = $this->parsepath($str);//替换图片路径

    $this->set_var($handle, $str);

    return true;

  }

  /*  重新分析替换模版目录下指定路径(一般为图片文件路径)

   */

  function parsepath($str = ""){

      if("/" != substr($this->path, -1)){

        $this->path .= "/";

    }

    if("./" == $this->path) return $str;

    $str = preg_replace("|".$this->path."|", $this->root."/".$this->path, $str);

    return $str;

  }

  /**********************/

  /* public: halt(string $msg)

   * msg:    error message to show.

   */

  function halt($msg) {

    $this->last_error = $msg;

    if ($this->halt_on_error != "no")

      $this->haltmsg($msg);

    if ($this->halt_on_error == "yes")

      die("<b>Halted.</b>");

    return false;

  }

  /* public, override: haltmsg($msg)

   * msg: error message to show.

   */

  function haltmsg($msg) {

    printf("<b>Template Error:</b> %s<br>\n", $msg);

  }

}

?>

<?

//这个声明表明moban目录和img目录在同一级目录下

$t = new Template("moban", "../img");

//这个表明img目录在moban目录里

$t = new Template("moban", "img");

?>

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