ci3登录退出功能

模型

//登录
const TBL_ADMIN = 'user';

public function get_admin($admin_name,$password){
    $condition = array(
        'username' => $admin_name,
        'password' => md5($password)
    );

    $query = $this->db->where($condition)->get(self::TBL_ADMIN);

    return $query->num_rows() > 0 ? true : false;
}

控制器

//登录执行

    public function logincarry()
    {

        $this->load->library('form_validation');
        #设置验证规则
        $this->form_validation->set_rules('username','用户名','required');
        $this->form_validation->set_rules('password','密码','required');

        #需要验证用户名和密码
        if ($this->form_validation->run() == false){
            $data['message'] = validation_errors();
/*            $data['url'] = site_url('login/lst');*/
            $data['wait'] = 3;
            $this->load->view('login/lst',$data);
        } else{
            $admin_name = $this->input->post('username',true);
            $password = $this->input->post('password',true);


            if ($this->user->get_admin($admin_name,$password)){
                # OK，保存session信息,然后跳转到首页
                $this->session->set_userdata('admin',$admin_name);
                redirect('indexx/index');
            } else{
                # error
                /*$data['url'] = site_url('admin/privilege/login');*/
                $data['message'] = '用户名和密码错误，请重新填写';
                $data['wait'] = 3;
                $this->load->view('login/lst',$data);
            }
        }



    }


    //退出
    public function logout(){
        $this->session->unset_userdata('admin');
        $this->session->sess_destroy();
        redirect('login/lst');
    }


视图

<form action="/admin.php/login/logincarry" method="post">
    <div class="loginbox bg-white">
        <div class="loginbox-title">SIGN IN</div>
        <div class="loginbox-textbox">
            <input class="form-control" placeholder="username" name="username" type="text">
        </div>
        <div class="loginbox-textbox">
            <input class="form-control" name="password" type="password">
        </div>
        <div class="loginbox-submit">
            <input class="btn btn-primary btn-block" value="Login" type="submit">
        </div>
    </div>
    <div class="logobox">
        <p class="text-center">skalpat</p>
    </div>
</form>