用户退出注销操作

对于已经登录的用户进行注销操作，界面如下：

微信图片_20180227163122.png

点击注销进行session的销毁操作，清空session里的内容，销毁一个会话中的全部数据，销毁PHPSESSID与cookie的联系，操作成功界面如下：

微信图片_20180227163132.png

代码如下：

logout.php

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/2/27 0027
 * Time: 上午 11:44
 */
header('Content-type:text/html;charset=utf-8');
session_start();
if(isset($_SESSION['username'])){
//     var_dump(session_name());die();
    session_unset($_SESSION['username']);
    session_destroy();//销毁一个会话中的全部数据
    setcookie(session_name(),'');//销毁与客户端的联系
    echo "<script>alert('注销成功！');location.href='login.html';</script>";
}else{
    echo "<script>alert('注销失败！');</script>";
}

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<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/2/27 0027
 * Time: 上午 10:47
 */
header('Content-type:text/html;charset=utf-8');
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
 if (empty($_POST['username'])){
 echo "<script>alert('用户名不能为空！');location.href='login.html';</script>";
 }else {
 $username=$_POST['username'];
 }
 if (empty($_POST['password'])){
 echo "<script>alert('密码不能为空！');location.href='login.html';</script>";
 }else{
 $password=$_POST['password'];
 }
}
$mysqli = new mysqli('localhost', 'root', 'root', 'student');
$result = $mysqli->query("SELECT password FROM user WHERE username = "."'$username'");
$rs=$result->fetch_row();
if (!empty($rs)){
 if ($password != $rs[0]) {
 echo "<script>alert('密码错误！');location.href='login.html';</script>";
 }else{
 $expire=3600;
 ini_set('session.gc_maxlifetime', $expire);//保存1小时
 if (empty($_COOKIE['PHPSESSID'])) {
 session_set_cookie_params($expire);
 session_start();
 }else{
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