项目采用 smarty 做模板引擎

common.php

<?php
/**
 * User: aaron
 * Date: 15/4/8
 * Time: PM2:05
 */

session_start();
/***
 * 数组调试函数
 * @param $arr
 */
function dump($arr)
{
    echo "<pre>";
    print_r($arr);
    echo "</pre>";
}

define("SITE_PATH", getcwd());
//加载smarty
require('libs/smarty/libs/Smarty.class.php');

class CommonController extends Smarty
{
    protected $db;

    function __construct()
    {
        parent::__construct();

        $this->setTemplateDir(...