diff --git "a/\347\252\246\347\253\213\346\235\250/0511-\345\226\235\351\245\256\346\226\231\344\275\234\344\270\232.md" "b/\347\252\246\347\253\213\346\235\250/0511-\345\226\235\351\245\256\346\226\231\344\275\234\344\270\232.md"
index e383c3d953960db75d0cb4c7babd5dd0fce985a2..7776c81bf751dc91a5f42a2ac3164988772830b2 100644
--- "a/\347\252\246\347\253\213\346\235\250/0511-\345\226\235\351\245\256\346\226\231\344\275\234\344\270\232.md"
+++ "b/\347\252\246\347\253\213\346\235\250/0511-\345\226\235\351\245\256\346\226\231\344\275\234\344\270\232.md"
@@ -1,4 +1,4 @@
-```php+HTML
+```php
 <?php
 /**
  * Created by PhpStorm.
@@ -19,7 +19,7 @@ echo $name."是直角三角形";
 }
 ```
 
-```php+HTML
+```php
 <?php
 /**
  * Created by PhpStorm.
@@ -33,7 +33,7 @@ $soda = 23;
 $n = 0;//积分
 $sum=0;
 for ($i=1;$i<=$soda;$i++){
-    if ($soda<=20){
+    if ($i<=20){
         $n=1.0;
     }else {
         $n=1.5;
@@ -43,7 +43,7 @@ for ($i=1;$i<=$soda;$i++){
 echo $sum;
 ```
 
-```php+HTML
+```php
 <?php
 /**
  * Created by PhpStorm.
diff --git "a/\347\252\246\347\253\213\346\235\250/0516-\346\261\202\345\234\206\347\232\204\351\235\242\347\247\257\344\275\234\344\270\232.md" "b/\347\252\246\347\253\213\346\235\250/0516-\346\261\202\345\234\206\347\232\204\351\235\242\347\247\257\344\275\234\344\270\232.md"
index da9f5bc48cf93a08974ce767ebe3dc422a9c5d2b..ff8337e0a8ef72b9e547b712a4edad974046c2b7 100644
--- "a/\347\252\246\347\253\213\346\235\250/0516-\346\261\202\345\234\206\347\232\204\351\235\242\347\247\257\344\275\234\344\270\232.md"
+++ "b/\347\252\246\347\253\213\346\235\250/0516-\346\261\202\345\234\206\347\232\204\351\235\242\347\247\257\344\275\234\344\270\232.md"
@@ -1,6 +1,6 @@
 ```php
 //1、	自定义函数求圆的面积
-//2、	对3个字符串函数至少进行应用
+
     $b = 10;//半径
     $pi = 3.14;//圆周率
 echo circle($pi,$b);
@@ -10,6 +10,23 @@ function circle($pi,$b){
     }
 ```
 
+```php
+//2、	对3个字符串函数至少进行应用
+<?php
+//2、	至少对3个字符串函数进行应用
+$num="  598461  ";
+echo"这个字串符的长度是:".strlen($num);
+echo"  截取最后两个字符".substr($num,4,2);
+$num=ltrim($num);
+echo"  去掉左边的空格：".ltrim($num);
+echo"  此时字串符的长度是:".strlen($num);
+$num=rtrim($num);
+echo"  去掉右边的空格：".rtrim($num);
+echo"  此时字串符的长度是:".strlen($num);
+```
+
+
+
 ```php
 //3、	写一段程序，创建一个数组，其元素内容为从1到20的所有整数，并输出该数组。
 $acc = array(1,2,3,4,5,6,7,8,9,10);
diff --git "a/\347\252\246\347\253\213\346\235\250/0523-php\351\207\214MySQL\347\232\204\345\242\236\345\210\240\346\224\271\346\237\245.md" "b/\347\252\246\347\253\213\346\235\250/0523-php\351\207\214MySQL\347\232\204\345\242\236\345\210\240\346\224\271\346\237\245.md"
new file mode 100644
index 0000000000000000000000000000000000000000..9136599dde3be60210cd463a6f9418104e336b90
--- /dev/null
+++ "b/\347\252\246\347\253\213\346\235\250/0523-php\351\207\214MySQL\347\232\204\345\242\236\345\210\240\346\224\271\346\237\245.md"
@@ -0,0 +1,48 @@
+```php
+CREATE DATABASE book CHARSET utf8;
+use book;
+CREATE TABLE user (
+user_id int PRIMARY KEY auto_increment, 
+user_name VARCHAR(20)NOT NULL,
+user_score DECIMAL(3.1) not NULL
+);
+```
+
+```php
+<?php
+$conn = mysqli_connect('localhost','root','123456','book') or die("连接失败：".mysqli_connect_error());
+mysqli_query($conn,"set names utf8");//设置传到mysql里的语言
+
+//添加数据
+$sql_1 = "insert into `user` (`user_name`,`user_score`) values ('陈小龙','98.5'),('吴大虫','75.5'),('陈得胜','66')";
+$result_1=mysqli_query($conn,$sql_1) or die("添加失败！");
+if ($result_1){
+    echo "添加成功！";
+}
+
+//删除数据
+$sql_2 = "delete from `user` where `user_id` =1";
+$result_2 = mysqli_query($conn,$sql_2) or die("删除失败！".mysqli_error($conn));
+if ($result_2){
+    echo "删除成功";
+}
+
+//查找数据
+$sql_3 = "select * from `user` ";//第一维
+$result_3 = mysqli_query($conn,$sql_3) or die("查询错误！".mysqli_error($conn));
+while ($a = mysqli_fetch_assoc($result_3)){
+    echo $a['user_id']." ".$a['user_name']."<br>";//第二维
+    $tt++;
+};
+echo "一共查到了".$tt."条数据" ;
+
+
+//修改数据
+$sql_4 = "update `user` set `user_name`='曾狗' where `user_id`=3";
+$result_4 = mysqli_query($conn,$sql_4) or die("修改失败！".mysqli_error($conn));
+if ($result_4){
+    echo "修改数据成功";
+}
+
+```
+
diff --git "a/\347\252\246\347\253\213\346\235\250/0524-\344\275\234\344\270\232.md" "b/\347\252\246\347\253\213\346\235\250/0524-\344\275\234\344\270\232.md"
new file mode 100644
index 0000000000000000000000000000000000000000..bfb78fee070b87262e957705c4bda8d6fe673940
--- /dev/null
+++ "b/\347\252\246\347\253\213\346\235\250/0524-\344\275\234\344\270\232.md"
@@ -0,0 +1,185 @@
+```sql
+//定义MySQL表格
+create database book charset utf8;
+use book;
+create table user(
+id int primary key auto_increment,
+name varchar(20) not null,
+score DECIMAL(3.1) not null
+);
+```
+
+
+
+```php
+//把常用的代码放在一个文件里需要直接导入即可
+<?php
+error_reporting(E_ALL^E_WARNING);
+$conn=mysqli_connect("localhost","root","123456","book") or die("连接失败!".mysqli_connect_errno());
+mysqli_query($conn,"set names utf8");//设置传到mysql里的语言
+```
+
+```php
+<?php
+include_once ('conn.php');
+$sql="select * from `user` ";
+$result=mysqli_query($conn,$sql);
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生信息管理</title>
+</head>
+<body>
+<h1>学生信息管理</h1>
+<table border="1" width="300">
+    <tr>
+        <th>学号</th>
+        <th>姓名</th>
+        <th>成绩</th>
+        <th>操作</th>
+    </tr>
+    <?php
+    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 $row['id'] ?>">删除</a></td>
+    </tr>
+        <?php
+     }
+    }
+    ?>
+</table>
+<a href="add.php">添加信息</a>
+</body>
+</html>
+```
+
+```html
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>添加学生信息</title>
+</head>
+
+<h1>添加学生信息</h1>
+<form action="save.php" method="post" >
+<table border="1" width="300">
+
+    <tr>
+        <th>姓名</th><td><input type="text" name="name"></td>
+    </tr>
+
+    <tr>
+        <th>成绩</th><td><input type="text" name="score"></td>
+    </tr>
+    <tr>
+        <td colspan="2" align="center"><input type="submit" value="提交" name='submit' ></td>
+    </tr>
+</table>
+    <a href="Dom.php">返回首页</a>
+</form>
+
+</html>
+```
+
+```php
+<?php
+include_once ('conn.php');
+
+ if(!isset($_POST['submit'])){
+     die("你通过访问的渠道不是很正规哦小逼崽子！！！");
+ }
+
+ $name=$_POST['name'];
+ $score=$_POST['score'];
+
+ $sql="insert into `user` (`name`,`score`)values ('$name',$score)";
+ $result=mysqli_query($conn,$sql);
+if($result){
+    echo "添加成功！<a href='Dom.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+
+```
+
+```php
+//修改数据
+<?php
+include_once ("conn.php");
+if(!isset($_GET['id'])){
+    die("你通过访问的渠道不是很正规哦小逼崽子！！！");
+}
+$id=$_GET['id'];
+$sql = "select * from `user` where `id`=$id";// 从数据库查询id为$book_id的数据
+$result = mysqli_query($conn,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+<html>
+<head>
+    <title>修改信息</title>
+
+</head>
+<h1>修改信息</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 $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp; <input type="reset" value="取消"></td>
+        </tr>
+    </table>
+    <a href="Dom.php">返回</a>
+
+</form>
+</html>
+```
+
+
+
+```php
+<?php
+include_once('conn.php');
+if(!isset($_POST['submit'])){
+    die("你通过访问的渠道不是很正规哦小逼崽子！！");
+}
+
+$id=$_POST['id'];
+$name=$_POST['name'];
+$score=$_POST['score'];
+$sql = "update `user` set `name`='$name',`score`=$score where id=$id";
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "修改成功！<a href='Dom.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
+```php
+//删除数据
+<?php
+include_once('conn.php');
+$id=$_GET['id'];
+$sql = "delete from `user` where id=$id";
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='Dom.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+```
+