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微信圖片_20180227163122.png

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微信圖片_20180227163132.png

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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();//銷毀一個(gè)會(huì)話中的全部數(shù)據(jù)
    setcookie(session_name(),'');//銷毀與客戶端的聯(lián)系
    echo "<script>alert('注銷成功！');location.href='login.html';</script>";
}else{
    echo "<script>alert('注銷失??！');</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('用戶名不能為空！');location.href='login.html';</script>"; }else { $username=$_POST['username']; } if (empty($_POST['password'])){ echo "<script>alert('密碼不能為空！');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('密碼錯(cuò)誤！');location.href='login.html';</script>"; }else{ $expire=3600; ini_set('session.gc_maxlifetime', $expire);//保存1小時(shí) if (empty($_COOKIE['PHPSESSID'])) { session_set_cookie_params($expire); session_start(); }else{ session_start(); setcookie('PHPSESSID', session_id(), time() + $expire); } if(isset($_SESSION['username'])){ exit("您已經(jīng)登入了，請(qǐng)不要重新登入！用戶名：{$_SESSION['username']}---<a href='logout.php'>注銷</a>"); }else{ $_SESSION['username']=$_POST['username']; } echo "<script>alert('登錄成功！');</script><br>"; echo "您好！{$_SESSION['username']},歡迎回來！"; echo "<a href='logout.php'>注銷</a>"; } }else{ echo "<script>alert('沒有此用戶！');location.href='login.html';</script>"; }