diff --git "a/\346\210\264\344\275\263\350\276\211/20220525-PHP\345\255\246\347\224\237\344\277\241\346\201\257.md" "b/\346\210\264\344\275\263\350\276\211/20220525-PHP\345\255\246\347\224\237\344\277\241\346\201\257.md"
new file mode 100644
index 0000000000000000000000000000000000000000..23e6a60c03a53a8651abec410c907b597069aada
--- /dev/null
+++ "b/\346\210\264\344\275\263\350\276\211/20220525-PHP\345\255\246\347\224\237\344\277\241\346\201\257.md"
@@ -0,0 +1,156 @@
+# 作业
+
+```PHP+HTML
+//---------conn.php
+<?php
+$link=mysqli_connect('localhost','root','root','student') or die("连接失败！");
+mysqli_query($link,'set names utf8');
+?>
+    
+//---------index.php
+<?php
+include_once('conn.php');
+$sql = "select * from `user` order by id ";
+$result=mysqli_query($link,$sql);
+?>
+<html>
+    <head>
+        <title>学生管理系统 - 首页</title>
+    </head>
+<body>
+    <h1>学生管理系统 - 首页</h1>
+    <meta charset="utf-8">
+<table border="1" cellpadding="0" cellspacing="0" width="600px">
+    <tr align="center">
+        <th>学号</th>
+        <th>姓名</th>
+        <th>年龄</th>
+        <th>籍贯</th>
+        <th>管理</th>
+    </tr>
+    <?php
+    if (!mysqli_num_rows($result)){
+        echo "<tr><td colspan='5' align='center'>没有数据！</td></tr>";
+    }
+    else{
+    while($add=mysqli_fetch_assoc($result)){
+        ?>
+    <tr align="center">
+        <td ><?php echo $add['id'] ?></td>
+        <td><?php echo $add['name'] ?></td>
+        <td><?php echo $add['age'] ?></td>
+        <td><?php echo $add['address'] ?></td>
+        <td><a href="update.php?id=<?php echo $add['id']?>">修改</a>|<a href="delete.php?id=<?php echo $add['id']?>">删除</a></td>
+    </tr>
+    <?php }
+    }
+    ?>
+</table>
+    <a href="add.php" target="_blank">添加学生数据</a>
+</body>
+</html>
+
+//---------add.php
+<?php
+?>
+<html>
+    <head>
+        <title>添加学生信息</title>
+    </head>
+<body>
+<h1>添加学生信息</h1>
+<form action="save.php" method="post" >
+    <table border="1" width="250px">
+        <tr><th>姓名</th><td><input type="text" name="name" ></td></tr>
+        <tr><th>年龄</th><td><input type="text" name="age" ></td></tr>
+        <tr><th>籍贯</th><td><input type="text" name="address" ></td></tr>
+        <tr align="center"><td colspan="2"><input type="submit" value="提交">|<input type="reset" value="重置"></td></tr>
+    </table>
+</form>
+</body>
+</html>
+
+//---------sava.php
+<?php
+//接收数据
+$name=$_POST['name'];
+$age=$_POST['age'];
+$address=$_POST['address'];
+
+//连接数据库
+include_once ('conn.php');
+$add="insert into `user` value (null,'$name','$age','$address')";
+$adds=mysqli_query($link,$add);
+if ($adds){
+    echo "添加成功!"."\t"."<a href='index.php'>返回主页</a>";
+}else{
+    echo "添加失败!".mysqli_error($link)."\t"."<a href='index.php'>返回主页</a>";
+}
+?>
+    
+//---------update.php
+<?php
+//接收<a>标签id数据
+$id=$_GET['id'];
+//连接数据库
+include_once ('conn.php');
+$result="select * from `user` where `id`=$id";
+$update=mysqli_query($link,$result);
+$arr=mysqli_fetch_assoc($update);//一行数据
+//var_dump($arr);
+?>
+<html>
+<head>
+    <title>修改学生信息</title>
+</head>
+<body>
+<h1>修改学生信息</h1>
+<form action="updatesave.php" method="post">
+    <table border="1" cellpadding="5" cellspacing="0">
+        <tr><th>学号</th><td><?php echo $arr['id'] ?></td>
+            <input type="text" name="id" value="<?php echo $arr['id'] ?>" hidden></tr>
+        <tr><th>姓名</th><td><input type="text" name="name" value="<?php echo $arr['name']?>"></td></tr>
+        <tr><th>年龄</th><td><input type="text" name="age" value="<?php echo $arr['age']?>"></td></tr>
+        <tr><th>籍贯</th><td><input type="text" name="address" value="<?php echo $arr['address']?>"></td></tr>
+        <tr align="center"><td colspan="2"><input type="submit" value="提交"></td></tr>
+    </table>
+</form>
+</body>
+</html>
+    
+//---------updatesave.php
+<?php
+//接收表单数据
+$id=$_POST['id'];
+$name=$_POST['name'];
+$age=$_POST['age'];
+$address=$_POST['address'];
+//连接数据库
+include_once ('conn.php');
+$update="update `user` set `name`='$name',`age`=$age,`address`='$address' where `id`=$id";
+mysqli_query($link,$update);
+$aa=mysqli_affected_rows($link);
+echo $aa;
+if($aa>0){
+    echo "修改成功!"."\t"."<a href='index.php'>返回主页</a>";
+}else if($aa<0){
+    echo "修改失败!".mysqli_error($link)."\t"."<a href='index.php'>返回主页</a>";
+}else{
+    echo "修改内容与原数据一致，无需修改！"."\t"."<a href='index.php'>返回主页</a>";
+}
+?>
+
+//---------delete.php
+<?php
+$id=$_GET['id'];
+include_once ('conn.php');
+$delete="delete from `user` where `id`=$id";
+$a=mysqli_query($link,$delete);
+if ($a){
+    echo "删除成功！"."\t"."<a href='index.php'>返回主页</a>";
+}else{
+    echo "删除失败！".mysqli_error($link)."\t"."<a href='index.php'>返回主页</a>";
+}
+?>
+```
+
