diff --git "a/\346\235\250\351\221\253\344\273\252/20220524-php\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/\346\235\250\351\221\253\344\273\252/20220524-php\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
new file mode 100644
index 0000000000000000000000000000000000000000..233c2aed3b99dcc61a5c71f6e563814ebc186db2
--- /dev/null
+++ "b/\346\235\250\351\221\253\344\273\252/20220524-php\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
@@ -0,0 +1,210 @@
+```sql
+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,"陈小龙",98.5),(2,"吴大虫",75.5),(3,"陈得胜",66);
+```
+
+//conn.php
+<?php
+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');// 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>
+        学生管理系统
+    </title>
+    <script>
+        function del(){
+            if(!window.confirm("确定要删除吗？")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生管理系统-首页</h1>
+<table border="1" width="300">
+    <tr>
+        <th>编号</th>
+        <th>姓名</th>
+        <th>成绩</th>
+        <th>操作</th>
+    </tr>
+    <?php
+    // 循环之前可以做个判断，结果集是否为空。
+    if(!mysqli_num_rows($result)) {//
+        echo "<tr align='center'><td colspan='4'>暂无数据！</td></tr>";
+    }else {
+    while ($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'] ?>">修改</a>|
+            <a href="delete.php?id=<?php echo $row['id'] ?>" onclick="return del();">删除</a></td>
+    </tr>
+        <?php
+    }
+    }
+    ?>
+</table>
+<a href="add.php">添加数据</a>
+</body>
+</html>
+
+
+//add.php
+<?php
+?>
+<html>
+<head>
+    <title>添加数据</title>
+</head>
+<h1>添加数据</h1>
+<form action="save.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>成绩</th><td><input type="text" name="score"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+
+
+//edit.php
+<?php
+include_once ("./conn.php");
+if(!isset($_GET['id'])){
+    die("非法访问！");
+}
+$id=$_GET['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>修改数据</title>
+
+</head>
+<h1>修改数据</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>姓名</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <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 $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+
+
+//update.php
+<?php
+/**
+ * 接收表单数据。并提交到数据库
+ */
+// 包含数据库连接文件
+include_once('conn.php');
+
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+$id=$_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 $sql;
+// 执行sql语句操作
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "修改成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+
+
+//delete.php
+<?php
+/**
+ * 接收表单数据。并提交到数据库
+ */
+// 包含数据库连接文件
+
+include_once('conn.php');
+$id=$_GET['id'];//  得到要删除的图书id
+
+
+// 定义要执行sql语句。
+$sql = "delete from `user` where id=$id";
+//echo $sql;
+// 执行sql语句操作
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+
+
+//save.php
+<?php
+/**
+ * 接收表单数据。并提交到数据库
+ */
+// 包含数据库连接文件
+include_once('conn.php');
+
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+
+$name=$_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 $sql;
+// 执行sql语句操作
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "添加成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
\ No newline at end of file
