代码如下：

      public function edit() {

            $ftype     = I('ftype', 0, 'intval');

            $fname     = I('fname', '', 'trim,htmlspecialchars');

            $file_path = !$ftype ? './Public/Home/' . C('CFG_THEMESTYLE') . '/' : './Public/Mobile/' . C('CFG_MOBILE_THEMESTYLE') . '/';

            if (IS_POST) {

                  if (empty($fname)) {

                        $this->error('未指定文件名');

                  }

                  $_ext     = '.' . pathinfo($fname, PATHINFO_EXTENSION);

                  $_cfg_ext = C('TMPL_TEMPLATE_SUFFIX');

                  if ($_ext != $_cfg_ext) {

                        $this->error('文件后缀必须为"' . $_cfg_ext . '"');

                  }



                  $content  = I('content', '', '');

                  $fname    = ltrim($fname, './');

                  $truefile = $file_path . $fname;

                  if (false !== file_put_contents($truefile, $content)) {

                        $this->success('保存成功', U('index', array('ftype' => $ftype)));

                  } else {

                        $this->error('保存文件失败，请重试');

                  }



                  exit();

            }



            $fname = base64_decode($fname);

            if (empty($fname)) {

                  $this->error('未指定要编辑的文件');

            }

            $truefile = $file_path . $fname;



            if (!file_exists($truefile)) {

                  $this->error('文件不存在');

            }

            $content = file_get_contents($truefile);

            if ($content === false) {

                  $this->error('读取文件失败');

            }

            $content = htmlspecialchars($content);



            $this->assign('ftype', $ftype);

            $this->assign('fname', $fname);

            $this->assign('content', $content);

            $this->assign('type', '修改模板');

            $this->display();

      }