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+# 一、学生管理系统
+
+## 1、首页 index
+
+```php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/25
+ * Time: 10:35
+ */
+
+//启动session
+session_start();
+// 判断是否登录
+if (isset($user) && $user == "admin"){
+    //服务器保存与本地保存
+	$user = $_SESSION['username']?:$_COOKIE['nsername'];
+    echo "学生管理系统首页";
+    echo "欢迎您：".$user;
+    echo "<br>"."<a href='logout.php'>注销</a>";
+}else{
+    echo "您未登录！<a href='login.html'>马上去登录</a>";
+    //header('location:login.html');//没有登录就直接跳转到登录页面
+}
+
+```
+
+## 2、登录 login
+
+```HTML
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生管理系统登录页面</title>
+</head>
+<body>
+<h1>学生管理系统登录界面</h1>
+<form action="login.php" method="post">
+    <table border="0" cellpadding="" cellspacing="">
+        <tr>
+            <td>用户名：</td>
+            <td><input type="text" name="username"></td>
+        </tr>
+        <tr>
+            <td>密码：</td>
+            <td><input type="password" name="password"></td>
+        </tr>
+        <tr>
+            <td></td>
+            <td><input type="checkbox" name="auto" value="yes">8小时内自动登录</td>
+        </tr>
+        <tr>
+            <td><input type="submit" value="登录"></td>
+        </tr>
+    </table>
+</form>
+</body>
+</html>
+```
+
+## 3、登录返回值 login
+
+```php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/25
+ * Time: 10:54
+ */
+session_start();
+//假设管理员账户如下
+$username = 'admin';
+$passwrod = '123456';
+//用超全局变量判断用户输入的账户密码是否对应
+if ($_POST['username']==$username && $_POST['password']==$passwrod){
+    echo "登录成功！";
+    //保存到服务端
+    $_SESSION['username']=$username;
+    //判断是否选择yes
+    if ($_POST['auto']=='yes'){
+        setcookie('username',"admin",time()+60*60*8);
+    }
+    //header('location:index.php');一旦账号正确就自动跳到首页
+    echo "<a href='index.php'>返回首页</a>";
+}else{
+    die("登录失败！");
+}
+```
+
+## 4、注销 logout
+
+```php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/25
+ * Time: 11:00
+ */
+//注销功能，就是删除session对应的值
+//启动
+session_start();
+unset($_SESSION['username']);
+setcookie('username','',time()-1);
+echo "注销成功";
+```
+
