ThinkPHP实现登录退出功能

<" username='$username' ")->find();
   //post过来的password拼接盐md5后密码=数据库的密码，则通过
   if(md5( I( ' post.password ' ) . $user[ ' salt ' ])===$user['password']{
    cookie('username' , $userp[ ' username ' ]);//写入cookie
    $this->redirect('/');//跳转到首页
   }else{
    echo '用户名或密码不对';
   }
  }
 }
}


/**V层
 * 退出登陆
 * 读取cookie $Think.cookie
 */
//若没有cookie数据
您好欢迎观临
<if condition="$Think.cookie.username eq null">
<a href="{:U('Home/User/login')}" rel="external nofollow" rel="external nofollow" style="color:#50884b">登陆</a> |
<a href="{:U('Home/User/reg')}" rel="external nofollow" style="color:#50884b">免费注册</a> |
<else />
{$Think.cookie.username}|
<<a href="{:U('Home/User/login')}" rel="external nofollow" rel="external nofollow" style="color:#50884b">退出</a>
 </if>


 /**
 * 退出方法
 * 1，cookie设为null，删除cookie
 * 2. 跳转到首页
 */
 public function logout(){
  cookie('username' , null);
  $this->redirect('/');
 }

 ?>}