diff --git "a/\345\262\221\346\230\245\346\237\263/2022.5.25-PHP.md" "b/\345\262\221\346\230\245\346\237\263/2022.5.25-PHP.md"
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+```html
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/25
+ * Time: 10:20
+ */
+include_once('conn.php');
+$sql = "select * from `bookinfo` order by student_id";
+$result = mysqli_query($conn,$sql);
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生信息系统</title>
+</head>
+<body>
+<h1>学生信息系统-首页</h1>
+<table border="1" width="600">
+    <form action="demo02l.php" method="post">
+        <tr align="center">
+        <tr>
+            <td>学生编号：</td><td><input type="text" name="user" id=""></td>
+        </tr>
+
+        <tr>
+            <td>学生姓名：</td><td><input type="text" name="username" id=""></td>
+        </tr>id、
+        <tr>
+            <td>学生成绩：</td><td><input type="text" name="userscore" id=""></td>
+        </tr>
+
+</table>
+</form>
+</body>
+</html>
+```
+
+```php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/25
+ * Time: 11:09
+ */
+session_start();
+$user = $_SESSION['username']?:$_COOKIE['username'];
+if(isset($user)  && $user=="id"){
+    echo "欢迎您：".$user;
+    echo "<a href='logout.php'>删除</a>";
+}
+```
+
+```php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/25
+ * Time: 10:28
+ */
+session_start();
+$userid='1';
+$username='陈小龙';
+$userscore='78.5';
+if ($_POST['userid']==$userid && $_POST['username']==$username && $_POST['userscore']==$userscore) {
+    echo "登录成功";
+   $_SESSION['userid']==$userid;
+   if ($_POST['auto']=='yes'){
+      setcookie('username','userid');
+
+   }
+   echo "<a href='demo3.php'>返回</a>";
+
+}else{
+    die ("登录失败");
+}
+```
+
+```php
+<?php
+session_start();
+unset($_SESSION['username']);
+setcookie('username','',time()-1);
+echo "注销成功";
+```
+
