diff --git "a/\346\235\216\347\221\236\351\230\263/20220524-php\345\255\246\347\224\237\347\263\273\347\273\237.md" "b/\346\235\216\347\221\236\351\230\263/20220524-php\345\255\246\347\224\237\347\263\273\347\273\237.md"
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index 0000000000000000000000000000000000000000..8875b17e14486edb62859900add21f4c6318b97f
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@@ -0,0 +1,233 @@
+```php
+<?php
+/**
+ *
+ * 建立一个专门用来连接服务器和数据库的文件
+ *
+ *
+ */
+error_reporting(E_ALL^E_WARNING);
+//连接服务器
+$conn=mysqli_connect('127.0.0.1','root','123456','studentt') or die("连接数据库有失败！");
+//设置字符utf8
+mysqli_query($conn,'set names utf8');
+```
+
+```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</h1>
+<table border="1" width="600">
+    <tr>
+        <th>学生编号</th>
+        <th>学生姓名</th>
+        <th>学生分数</th>
+    </tr>
+
+<?php
+// 循环之前可以做个判断，结果集是否为空
+    if(!mysqli_num_rows($result)){
+        echo"<tr align='center'><td colspan='5'>暂无数据！</td></tr>";
+    }else{
+while ($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="delete1.php?id=<?php echo $row['id'] ?>" onclick="return del();">删除</a></td>
+    </tr>
+    <?php
+}
+    }
+    ?>
+</table>
+<a href="add.php">添加信息</a>
+</body>
+</html>
+```
+
+```php
+<?php
+//添加信息
+?>
+<html>
+<head>
+    <title>添加信息</title>
+
+</head>
+<h1>添加学生成绩</h1>
+<!--创建一个表单来收集新加的信息，把收集的信息传给save.php-->
+<form action="save.php" method="post">
+    <table border="1" width="300">
+
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="score"></td>
+        </tr>
+
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+```
+
+```php
+<?php
+//保存添加的信息到数据库
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+//如果不是从添加信息界面里的提交按钮过来的会拒绝访问
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+//从add.php的表单里获取post传输的信息
+$student_name=$_POST['name'];// 姓名
+$student_score=$_POST['score'];// 成绩
+
+
+// 定义要执行sql语句。
+$sql = "insert into `user` (name,score)
+ values ('$student_name','$student_score')";
+//echo $sql;
+// 执行sql语句操作
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "添加成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
+```
+
+```php
+<?php
+//修改信息
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+
+$student_id=$_GET['id'];
+//sql语句
+$sql = "select * from `user` where `id`=$student_id";
+//执行sql语句
+$res = mysqli_query($conn,$sql);
+//将查询到的要修改的那行信息转为数组
+$row = mysqli_fetch_assoc($res);
+?>
+
+
+<html>
+<head>
+    <title>修改学生信息</title>
+
+</head>
+<!--创建一个修改信息用的表单,把收集的信息传给update.php-->
+<h1>修改信息</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>学生名称</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+        </tr>
+        <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden><!--hidden是隐藏这条信息的意思-->
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+```
+
+```php
+<?php
+//保存修改完的信息到数据库
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+
+
+if (!isset($_POST['submit'])) {
+    die("非法访问！");
+}
+//从edit.php界面获取新的信息
+$student_name = $_POST['name'];// 学生姓名
+$student_score= $_POST['score'];// 成绩
+
+// 定义要执行sql语句。
+$sql = "update `user` set `name`='$student_name',score='$student_score'";
+//echo $sql;
+// 执行sql语句操作
+$res = mysqli_query($conn, $sql);
+if ($res) {
+    echo "修改成功！<a href='./index.php'>返回首页</a>";
+} else {
+    echo "修改失败！";
+}
+```
+
+```php
+<?php
+//删除信息
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+
+
+
+
+//用get得到要删除的学生id
+$student_id = $_GET['id'];
+//创建sql删除语句
+$sql = "delete from `user` where id=$student_id";
+//执行上面的sql语句
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
