P粉5738097272023-08-22 13:18:23
This is the simplest session code written in PHP. We used 3 files.
login.php
<?php session_start(); // 使用此函数启动会话
if(isset($_SESSION['use'])) // 检查会话是否已存在，如果存在则直接重定向到主页
{
header("Location:home.php");
}
if(isset($_POST['login'])) // 检查用户是否点击了登录按钮
{
$user = $_POST['user'];
$pass = $_POST['pass'];
if($user == "Ank" && $pass == "1234") // 用户名默认为“Ank”，密码默认为1234
{
$_SESSION['use']=$user;
echo '<script type="text/javascript"> window.open("home.php","_self");</script>'; // 登录成功后重定向到home.php
}
else
{
echo "无效的用户名或密码";
}
}
?>
<html>
<head>
<title> 登录页面 </title>
</head>
<body>
<form action="" method="post">
<table width="200" border="0">
<tr>
<td> 用户名</td>
<td> <input type="text" name="user" > </td>
</tr>
<tr>
<td> 密码 </td>
<td><input type="password" name="pass"></td>
</tr>
<tr>
<td> <input type="submit" name="login" value="登录"></td>
<td></td>
</tr>
</table>
</form>
</body>
</html>
home.php
<?php session_start(); ?>
<html>
<head>
<title> 主页 </title>
</head>
<body>
<?php
if(!isset($_SESSION['use'])) // 如果会话未设置，则重定向到登录页面
{
header("Location:Login.php");
}
echo $_SESSION['use'];
echo "登录成功";
echo "<a href='logout.php'> 退出</a> ";
?>
</body>
</html>
logout.php
<?php
session_start();
echo "成功退出";
session_destroy(); // 销毁会话
header("Location: Login.php");
?>P粉3480889952023-08-22 12:03:57
To start a session, you need to say this at the top of the page or before calling the session code
session_start();
Put user ID into session to track who is logged in
$_SESSION['user'] = $user_id;
Check if anyone is logged in
if (isset($_SESSION['user'])) {
// 已登录
} else {
// 未登录
}
Find the ID of the logged in user
$_SESSION['user']
On your page
<?php
session_start();
if (isset($_SESSION['user'])) {
?>
已登录的HTML和代码在这里
<?php
} else {
?>
未登录的HTML和代码在这里
<?php
}