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批改狀態(tài)：合格
老師批語：用unset()刪除COOKIE時要注意, 千萬不要把$_COOKIE刪除了
COOKIE知識點(diǎn)
1.設(shè)置： setcookie('username','admin');
2.讀取：echo $_COOKIE['username'];
3.更新： $_COOKIE['username']='peter zhu';
4.刪除：unset($_COOKIE['username']);
SESSION知識點(diǎn)
1.啟動會話 session_start();
2.設(shè)置：$_SESSION['username'] = 'peter zhu';
3.讀?。篹cho $_SESSION['username'];
4.刪除： session_unset(); 刪除session內(nèi)容
session_destory();刪除session文件；
刪除PHPSESSID setcookie('PHPSESSID','空'，time()-3600);
COOKIE網(wǎng)站演示： pc.wenbus.cn/0726/cookie/index.php
SEESION網(wǎng)站演示： pc.wenbus.cn/0726/session/index.php
COOKIE演示案例代碼
index.php代碼
<?php
if(isset($_COOKIE['username']) && $_COOKIE['username'] === 'admin'){
//已登錄顯示
echo '用戶：'.$_COOKIE['username'].'已登錄';
echo '<a href="dispatch.php?action=logout">退出</a>';
}
else
{
//未登錄顯示
echo '<a href="dispatch.php?action=login">請登錄</a>';
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
// 請求派發(fā)器
require __DIR__ . '/inc/connect.php';
// 獲取請求參數(shù)
$action = isset($_GET['action']) ? $_GET['action'] : 'login';
$action = htmlentities(strtolower(trim($action)));
switch($action){
// 1.登錄頁面
case 'login':
include __DIR__ . '/login.php';
break;
//2.驗(yàn)證頁面
case 'check':
include __DIR__ . '/check.php';
break;
//3.退出頁面
case 'logout':
include __DIR__ . '/logout.php';
break;
//4.其他數(shù)據(jù)
default:
header('Location: index.php');
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
// 防止重復(fù)登錄
if(isset($_COOKIE['username']) && $_COOKIE['username'] === 'admin'){
echo '<script>alert("不要重復(fù)登錄");location.assign("index.php");</script>';
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用戶登錄</title>
</head>
<body>
<form action="dispatch.php?action=check" method="POST" onsubmit="return isEmpty();">
<p>
<label for="email">郵箱：</label>
<input type="email" id="email" name="email">
</p>
<p>
<label for="password">密碼：</label>
<input type="password" id="password" name="password">
</p>
<p>
<button>登錄</button>
</p>
</form>
<script>
// 防止不輸入數(shù)據(jù)提交
function isEmpty() {
var email = document.getElementById('email').value;
var password = document.getElementById('password').value;
if (email.length === 0 || password.length === 0) {
return false;
}
}
</script>
</body>
</html>點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
// 先判斷是不是POST模式
if ($_SERVER['REQUEST_METHOD'] === 'POST'){
//獲取表單數(shù)據(jù)
$email = $_POST['email'];
$password = sha1($_POST['password']);
// 輸入數(shù)據(jù)與數(shù)據(jù)表數(shù)據(jù)驗(yàn)證
$sql = 'SELECT * FROM `user` WHERE `email` =:email AND `password` =:password LIMIT 1';
$stmt = $pdo->prepare($sql);
$stmt->execute(['email'=>$email,'password'=>$password]);
$user = $stmt ->fetch(PDO::FETCH_ASSOC);
if(false === $user){
echo '<script> alert("驗(yàn)證失敗");history.back();</script>';
die;
}
setcookie('username',$user['username']);
echo '<script> alert("驗(yàn)證成功");location.assign("index.php")</script>';
exit;
}else{
die("請求類型錯誤");
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
if (isset($_COOKIE['username']) && $_COOKIE['username']==='admin'){
setcookie('username',null,time()-3600);
echo '<script>alert("退出成功");location.assign("login.php");</script>';
}else{
echo '<script>alert("請先登錄");location.assign("login.php")</script>';
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
session_start();
if (isset($_SESSION['username']) && $_SESSION['username']==='admin'){
echo '用戶：' .$_SESSION['username']. '已登錄<br>';
echo '<a href="dispatch.php?action=logout">注銷</a>';
}else{
echo '<a href="dispatch.php?action=login">請登錄</a>';
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
// session_start();
require __DIR__ .'/inc/connect.php';
$action = isset($_GET['action']) ? $_GET['action'] : 'login';
$action = htmlentities(strtolower(trim($action)));
switch ($action){
case 'login':
include __DIR__ .'/login.php';
break;
case 'logout':
include __DIR__ .'/logout.php';
break;
case 'check':
include __DIR__ .'/check.php';
break;
default:
header('Location:index.php');
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
session_start();
if ($_SERVER['REQUEST_METHOD']==='POST'){
$email = $_POST['email'];
$password = sha1($_POST['password']);
$sql = 'SELECT * FROM `user` WHERE `email` =:email AND `password` =:password LIMIT 1';
$stmt = $pdo->prepare($sql);
$stmt -> execute(['email'=>$email,'password'=>$password]);
$user = $stmt ->fetch(PDO::FETCH_ASSOC);
// var_dump($user);
if (false === $user){
echo '<script>alert("驗(yàn)證失敗");history.back()</script>';
die;
}
$_SESSION['username']= $user['username'];
echo '<script>alert("驗(yàn)證成功");location.assign("index.php")</script>';
exit;
}else{
die("請求類型錯誤");
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
session_start();
if (isset($_SESSION['username']) && $_SESSION['username']==='admin'){
echo '<script>alert("請不要重復(fù)登錄");location.assign("index.php");</script>';
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用戶登錄</title>
</head>
<body>
<form action="dispatch.php?action=check" method="POST" onsubmit="return isEmpty();">
<p>
<label for="email">郵箱：</label>
<input type="email" id="email" name="email">
</p>
<p>
<label for="password">密碼：</label>
<input type="password" id="password" name="password">
</p>
<p>
<button>登錄</button>
</p>
</form>
<script>
function isEmpty() {
var email = document.getElementById('email').value;
var password = document.getElementById('password').value;
if(email.length===0||password.length===0){
return false;
}
}
</script>
</body>
</html>點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
<?php
session_start();
if (isset($_SESSION['username']) && $_SESSION['username'] === 'admin') {
session_unset();
setcookie('PHPSESSID', null, time()-3600);
echo '<script>alert("退出成功");location.assign("index.php");</script>';
} else {
echo '<script>alert("請先登錄");location.assign("login.php");</script>';
}點(diǎn)擊 "運(yùn)行實(shí)例" 按鈕查看在線實(shí)例
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