<?php

namespace Admin\Controller;

header('Content-type:text/html;charset=utf-8');

use Think\Controller;

class LoginController extends Controller {

    public function index(){

        $this->display('login');

    }

        public function login(){

            $username = I("post.username");

            $pass = I("post.pass");

            $post = [

                'username'=> $username,

                'pass' => md5($pass)

            ];

            $model = D("admins");

            $data = $model->where($post)->find();

            $_SESSION['id'] = $data['id'];   //写入session

            if($data == Null){

                $this->error("登录失败",U("login/index"));

            }else{

                $this->success('登录成功',U("Index/index"));

            }

    }

        public function login_out(){

         $_SESSION['id'] = null;

         $this->display('login');

    }

}

<?php

namespace Admin\Controller;

header('Content-type:text/html;charset=utf-8');

use Think\Controller;

class CommonController extends Controller {

        public function _initialize(){

            if(empty($_SESSION['id'])){

                $this->error("请登录",U("login/index"));

            }

        }

}

use Think\Controller;

class GoodsController extends CommonController {  //都继承这个CommonController 

    public function index() {

class IndexController extends CommonController {

    public function index(){