diff --git "a/\346\261\244\344\272\246\345\207\241/20220524-php\347\275\221\351\241\265\345\210\266\344\275\234.md" "b/\346\261\244\344\272\246\345\207\241/20220524-php\347\275\221\351\241\265\345\210\266\344\275\234.md"
index ac33d0bda4ee686fd5581739ea87b95b842f64c6..7bcc3b96562091d25d007a4473d341cf05598724 100644
--- "a/\346\261\244\344\272\246\345\207\241/20220524-php\347\275\221\351\241\265\345\210\266\344\275\234.md"
+++ "b/\346\261\244\344\272\246\345\207\241/20220524-php\347\275\221\351\241\265\345\210\266\344\275\234.md"
@@ -6,50 +6,53 @@ id int PRIMARY key auto_increment,
 name VARCHAR(20) not null,
 score DECIMAL(5,2) not null
 );
-INSERT into user VALUES (1,"��С��",98.5),(2,"����",75.5),(3,"�µ�ʤ",66);
+INSERT into user VALUES (1,"陈小龙",98.5),(2,"吴大虫",75.5),(3,"陈得胜",66);
 ```
 ```php
 
 
 //conn.php
 <?php
+//error_reporting() 设置 PHP 的报错级别并返回当前级别。
+//E_ALL - 所有的错误和警告
+//E_WARNING - 运行时警告
 error_reporting(E_ALL ^ E_WARNING);
 $conn=mysqli_connect("127.0.0.1","root","123456","student");
 mysqli_query($conn,'set names utf8');
 
 //index.php
 <?php
-include_once('conn.php');// �������ݿ��ļ�
-$sql = "select * from `user` order by id";// ��user������������ݲ�ѯ���������
-$result = mysqli_query($conn,$sql);//ִ����������,����һ�������
+include_once('conn.php');// 包含数据库文件
+$sql = "select * from `user` order by id";// 把user表里的所有数据查询出来的语句
+$result = mysqli_query($conn,$sql);//执行上面的语句,返回一个结果集
 ?>
 <html>
 <head>
     <meta charset="utf-8">
     <title>
-        ѧ������ϵͳ
+        学生管理系统
     </title>
     <script>
         function del(){
-            if(!window.confirm("ȷ��Ҫɾ����")){
+            if(!window.confirm("确定要删除吗？")){
                 return false;
             }
         }
     </script>
 </head>
 <body>
-<h1>ѧ������ϵͳ-��ҳ</h1>
+<h1>学生管理系统-首页</h1>
 <table border="1" width="300">
     <tr>
-        <th>���</th>
-        <th>����</th>
-        <th>�ɼ�</th>
-        <th>����</th>
+        <th>编号</th>
+        <th>姓名</th>
+        <th>成绩</th>
+        <th>操作</th>
     </tr>
     <?php
-    // ѭ��֮ǰ���������жϣ�������Ƿ�Ϊ�ա�
-    if(!mysqli_num_rows($result)) {//
-        echo "<tr align='center'><td colspan='4'>�������ݣ�</td></tr>";
+    // 循环之前可以做个判断，结果集是否为空。
+    if(!mysqli_num_rows($result)) {//mysqli_num_rows() 函数返回结果集中行的数量。
+        echo "<tr align='center'><td colspan='4'>暂无数据！</td></tr>";
     }else {
     while ($row = mysqli_fetch_assoc($result)) {
     ?>
@@ -57,15 +60,19 @@ $result = mysqli_query($conn,$sql);//ִ
         <td><?php echo $row['id'] ?></td>
         <td><?php echo $row['name'] ?></td>
         <td><?php echo $row['score'] ?></td>
-        <td><a href="edit.php?id=<?php echo $row['id'] ?>">�޸�</a>|
-            <a href="delete.php?id=<?php echo $row['id'] ?>" onclick="return del();">ɾ��</a></td>
+        <td><a href="edit.php?id=<?php echo $row['id'] ?>">修改</a>|
+            <a href="delete.php?id=<?php echo $row['id'] ?>" onclick="return del();">删除</a></td>
     </tr>
+//onclick在html中的用法是鼠标点击事件执行脚本，onclick是HTML标记对象的一个属性，当鼠标被单击时执行设定要执行的javascript脚本。
+//onclick 属性由元素上的鼠标点击触发。
+
+//注释：onclick 属性不适用以下元素：<base>、<bdo>、<br>、<head>、<html>、<iframe>、<meta>、<param>、<script>、<style> 或 <title>。
         <?php
     }
     }
     ?>
 </table>
-<a href="add.php">��������</a>
+<a href="add.php">添加数据</a>
 </body>
 </html>
 
@@ -75,24 +82,24 @@ $result = mysqli_query($conn,$sql);//ִ
 ?>
 <html>
 <head>
-    <title>��������</title>
+    <title>添加数据</title>
 </head>
-<h1>��������</h1>
+<h1>添加数据</h1>
 <form action="save.php" method="post">
     <table border="1" width="300">
         <tr>
-            <th>����</th><td><input type="text" name="name"></td>
+            <th>姓名</th><td><input type="text" name="name"></td>
         </tr>
         <tr>
-            <th>�ɼ�</th><td><input type="text" name="score"></td>
+            <th>成绩</th><td><input type="text" name="score"></td>
         </tr>
         <tr>
-            <td colspan="2" align="center"><input type="submit" name='submit' value="�ύ">&nbsp;&nbsp;&nbsp;&nbsp;
-                <input type="reset" value="ȡ��"></td>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="取消"></td>
 
         </tr>
     </table>
-    <a href="index.php">����</a>
+    <a href="index.php">返回</a>
 
 </form>
 </html>
@@ -102,36 +109,36 @@ $result = mysqli_query($conn,$sql);//ִ
 <?php
 include_once ("./conn.php");
 if(!isset($_GET['id'])){
-    die("�Ƿ����ʣ�");
+    die("非法访问！");
 }
 $id=$_GET['id'];
 
-$sql = "select * from `user` where `id`=$id";// �����ݿ��ѯidΪ$id������
+$sql = "select * from `user` where `id`=$id";// 从数据库查询id为$id的数据
 $result = mysqli_query($conn,$sql);
 $row = mysqli_fetch_assoc($result);
 ?>
 <html>
 <head>
-    <title>�޸�����</title>
+    <title>修改数据</title>
 
 </head>
-<h1>�޸�����</h1>
+<h1>修改数据</h1>
 <form action="update.php" method="post">
     <table border="1" width="300">
         <tr>
-            <th>����</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+            <th>姓名</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
         </tr>
         <tr>
-            <th>�ɼ�</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+            <th>成绩</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
         </tr>
         <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden>
         <tr>
-            <td colspan="2" align="center"><input type="submit" name='submit' value="�ύ">&nbsp;&nbsp;&nbsp;&nbsp;
-                <input type="reset" value="ȡ��"></td>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="取消"></td>
 
         </tr>
     </table>
-    <a href="index.php">����</a>
+    <a href="index.php">返回</a>
 
 </form>
 </html>
@@ -140,73 +147,73 @@ $row = mysqli_fetch_assoc($result);
 //update.php
 <?php
 /**
- * ���ձ������ݡ����ύ�����ݿ�
+ * 接收表单数据。并提交到数据库
  */
-// �������ݿ������ļ�
+// 包含数据库连接文件
 include_once('conn.php');
 
 if(!isset($_POST['submit'])){
-    die("�Ƿ����ʣ�");
+    die("非法访问！");
 }
-$id=$_POST['id'];//���
-$name=$_POST['name'];// ����
-$score=$_POST['score'];// �ɼ�
-// ����Ҫִ��sql��䡣
+$id=$_POST['id'];//编号
+$name=$_POST['name'];// 姓名
+$score=$_POST['score'];// 成绩
+// 定义要执行sql语句。
 $sql = "update `user` set `name`='$name',score=$score where id=$id";
 //echo $sql;
-// ִ��sql������
+// 执行sql语句操作
 $ret = mysqli_query($conn,$sql);
 if($ret){
-    echo "�޸ĳɹ���<a href='./index.php'>������ҳ</a>";
+    echo "修改成功！<a href='./index.php'>返回首页</a>";
 }else{
-    echo "�޸�ʧ�ܣ�";
+    echo "修改失败！";
 }
 
 
 //delete.php
 <?php
 /**
- * ���ձ������ݡ����ύ�����ݿ�
+ * 接收表单数据。并提交到数据库
  */
-// �������ݿ������ļ�
+// 包含数据库连接文件
 
 include_once('conn.php');
-$id=$_GET['id'];//  �õ�Ҫɾ����ͼ��id
+$id=$_GET['id'];//  得到要删除的图书id
 
 
-// ����Ҫִ��sql��䡣
+// 定义要执行sql语句。
 $sql = "delete from `user` where id=$id";
 //echo $sql;
-// ִ��sql������
+// 执行sql语句操作
 $ret = mysqli_query($conn,$sql);
 if($ret){
-    echo "ɾ���ɹ���<a href='./index.php'>������ҳ</a>";
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
 }else{
-    echo "ɾ��ʧ�ܣ�";
+    echo "删除失败！";
 }
 
 
 //save.php
 <?php
 /**
- * ���ձ������ݡ����ύ�����ݿ�
+ * 接收表单数据。并提交到数据库
  */
-// �������ݿ������ļ�
+// 包含数据库连接文件
 include_once('conn.php');
 
 if(!isset($_POST['submit'])){
-    die("�Ƿ����ʣ�");
+    die("非法访问！");
 }
 
-$name=$_POST['name'];// ����
-$score=$_POST['score'];// �ɼ�
-// ����Ҫִ��sql��䡣
+$name=$_POST['name'];// 姓名
+$score=$_POST['score'];// 成绩
+// 定义要执行sql语句。
 $sql = "insert into `user` (name,score) values ('$name',$score)";
 //echo $sql;
-// ִ��sql������
+// 执行sql语句操作
 $ret = mysqli_query($conn,$sql);
 if($ret){
-    echo "���ӳɹ���<a href='./index.php'>������ҳ</a>";
+    echo "添加成功！<a href='./index.php'>返回首页</a>";
 }else{
-    echo "����ʧ�ܣ�";
+    echo "添加失败！";
 }
diff --git "a/\346\261\244\344\272\246\345\207\241/20220525-php\347\231\273\345\275\225\347\275\221\351\241\265.md" "b/\346\261\244\344\272\246\345\207\241/20220525-php\347\231\273\345\275\225\347\275\221\351\241\265.md"
new file mode 100644
index 0000000000000000000000000000000000000000..7f32ae4b0e885b3ab0f7849658c5f813dd817cd0
--- /dev/null
+++ "b/\346\261\244\344\272\246\345\207\241/20220525-php\347\231\273\345\275\225\347\275\221\351\241\265.md"
@@ -0,0 +1,285 @@
+```mysql
+CREATE DATABASE student CHARSET utf8;
+use student;
+CREATE table user(
+id int PRIMARY key auto_increment,
+name VARCHAR(20) not null,
+score DECIMAL(5,2) not null
+);
+INSERT into user VALUES (1,"��С��",98.5),(2,"����",75.5),(3,"�µ�ʤ",66);
+```
+```php
+//conn.php
+<?php
+//error_reporting() ���� PHP �ı������𲢷��ص�ǰ����
+//E_ALL - ���еĴ���;���
+//E_WARNING - ����ʱ����
+error_reporting(E_ALL ^ E_WARNING);
+$conn=mysqli_connect("127.0.0.1","root","123456","student");
+mysqli_query($conn,'set names utf8');
+```
+```html
+//login.html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>ѧ������ϵͳ��¼����</title>
+</head>
+<body>
+<h1>ѧ������ϵͳ��¼����</h1>
+<form action="login.php" method="post">
+    <table border="0" cellpadding="" cellspacing="">
+        <tr>
+            <td>�û�����</td><td><input type="text" name="username" ></td>
+        </tr>
+        <tr>
+            <td>���룺</td><td><input type="password" name="password" ></td>
+        </tr>
+        <!--<tr>-->
+            <!--<td> </td><td><input type="checkbox" name="auto" value="yes">7�����Զ���¼</td>-->
+        <!--</tr>-->
+        <tr>
+            <td><input type="submit" value="��¼"></td>
+        </tr>
+    </table>
+</form>
+</body>
+</html>
+```
+```php
+//login.php
+<?php
+session_start();
+// �ʺ�����
+$username = 'admin';
+$password = '123456';
+//var_dump($_POST);
+if($_POST['username']==$username && $_POST['password']==$password){
+    echo "��¼�ɹ���";
+    $_SESSION['username']=$username;
+//    if($_POST['auto']=='yes'){
+//        setcookie('username',"admin",time()+60*60*24*7);
+//    }
+//    header('location:index.php'); һ���ʺ���ȷ���Զ�������ҳ
+    echo "<a href ='index.php'>������ҳ</a>";
+}else{
+    echo "��¼ʧ�ܣ�<a href='login.html'>�����µ�¼</a>";
+}
+
+```
+```php
+//logout.php
+<?php
+// ע�����ܣ�����ɾ��session��Ӧ��ֵ
+session_start();
+unset($_SESSION['username']);
+setcookie('username','',time()-1);
+echo "ע���ɹ�";
+```
+```php
+//index.php
+<?php
+session_start();
+//isset �жϱ����Ƿ����
+if (!isset($_SESSION['username'])){
+//    die("��½ʧ��");
+    echo "��¼ʧ�ܣ�<br>";
+    echo "���ص�¼����<br><a href='login.html'>�����µ�¼</a>";
+    die();
+}
+include_once('conn.php');// �������ݿ��ļ�
+$sql = "select * from `user` order by id";// ��user������������ݲ�ѯ���������
+$result = mysqli_query($conn,$sql);//ִ����������,����һ�������
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>
+        ѧ������ϵͳ
+    </title>
+    <script>
+        function del(){
+            if(!window.confirm("ȷ��Ҫɾ����")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>ѧ������ϵͳ-��ҳ</h1>
+<table border="1" width="300">
+    <tr>
+        <th>���</th>
+        <th>����</th>
+        <th>�ɼ�</th>
+        <th>����</th>
+    </tr>
+    <?php
+    // ѭ��֮ǰ���������жϣ�������Ƿ�Ϊ�ա�
+    if(!mysqli_num_rows($result)) {//mysqli_num_rows() �������ؽ�������е�������
+        echo "<tr align='center'><td colspan='4'>�������ݣ�</td></tr>";
+    }else {
+    while ($row = mysqli_fetch_assoc($result)) {
+    ?>
+    <tr align="center">
+        <td><?php echo $row['id'] ?></td>
+        <td><?php echo $row['name'] ?></td>
+        <td><?php echo $row['score'] ?></td>
+        <td><a href="edit.php?id=<?php echo $row['id'] ?>">�޸�</a>|
+            <a href="delete.php?id=<?php echo $row['id'] ?>" onclick="return del();">ɾ��</a></td>
+    </tr>
+//onclick��html�е��÷���������¼�ִ�нű���onclick��HTML��Ƕ����һ�����ԣ�����걻����ʱִ���趨Ҫִ�е�javascript�ű���
+//onclick ������Ԫ���ϵ������������
+
+//ע�ͣ�onclick ���Բ���������Ԫ�أ�<base>��<bdo>��<br>��<head>��<html>��<iframe>��<meta>��<param>��<script>��<style> �� <title>��
+        <?php
+    }
+    }
+    ?>
+</table>
+<a href="add.php">��������</a>
+</body>
+</html>
+```
+```php
+//add.php
+<?php
+?>
+<html>
+<head>
+    <title>��������</title>
+</head>
+<h1>��������</h1>
+<form action="save.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>����</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>�ɼ�</th><td><input type="text" name="score"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="�ύ">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="ȡ��"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">����</a>
+
+</form>
+</html>
+```
+```php
+//edit.php
+<?php
+include_once ("./conn.php");
+if(!isset($_GET['id'])){
+    die("�Ƿ����ʣ�");
+}
+$id=$_GET['id'];
+
+$sql = "select * from `user` where `id`=$id";// �����ݿ��ѯidΪ$id������
+$result = mysqli_query($conn,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+<html>
+<head>
+    <title>�޸�����</title>
+
+</head>
+<h1>�޸�����</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>����</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>�ɼ�</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+        </tr>
+        <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="�ύ">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="ȡ��"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">����</a>
+
+</form>
+</html>
+```
+```php
+//update.php
+<?php
+/**
+ * ���ձ������ݡ����ύ�����ݿ�
+ */
+// �������ݿ������ļ�
+include_once('conn.php');
+
+if(!isset($_POST['submit'])){
+    die("�Ƿ����ʣ�");
+}
+$id=$_POST['id'];//���
+$name=$_POST['name'];// ����
+$score=$_POST['score'];// �ɼ�
+// ����Ҫִ��sql��䡣
+$sql = "update `user` set `name`='$name',score=$score where id=$id";
+//echo $sql;
+// ִ��sql������
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "�޸ĳɹ���<a href='./index.php'>������ҳ</a>";
+}else{
+    echo "�޸�ʧ�ܣ�";
+}
+```
+```php
+//delete.php
+<?php
+/**
+ * ���ձ������ݡ����ύ�����ݿ�
+ */
+// �������ݿ������ļ�
+
+include_once('conn.php');
+$id=$_GET['id'];//  �õ�Ҫɾ����ͼ��id
+
+
+// ����Ҫִ��sql��䡣
+$sql = "delete from `user` where id=$id";
+//echo $sql;
+// ִ��sql������
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "ɾ���ɹ���<a href='./index.php'>������ҳ</a>";
+}else{
+    echo "ɾ��ʧ�ܣ�";
+}
+```
+```php
+//save.php
+<?php
+/**
+ * ���ձ������ݡ����ύ�����ݿ�
+ */
+// �������ݿ������ļ�
+include_once('conn.php');
+
+if(!isset($_POST['submit'])){
+    die("�Ƿ����ʣ�");
+}
+
+$name=$_POST['name'];// ����
+$score=$_POST['score'];// �ɼ�
+// ����Ҫִ��sql��䡣
+$sql = "insert into `user` (name,score) values ('$name',$score)";
+//echo $sql;
+// ִ��sql������
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "���ӳɹ���<a href='./index.php'>������ҳ</a>";
+}else{
+    echo "����ʧ�ܣ�";
+}
\ No newline at end of file

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