diff --git "a/\346\261\244\344\272\246\345\207\241/20220518-PHP\346\226\207\344\273\266\344\270\212\344\274\240\345\222\214\345\274\202\345\270\270\345\244\204\347\220\206.md" "b/\346\261\244\344\272\246\345\207\241/20220518-PHP\346\226\207\344\273\266\344\270\212\344\274\240\345\222\214\345\274\202\345\270\270\345\244\204\347\220\206.md"
index a502b65903affbb6f8d1b4c37626ea53026d935c..b63085fbe0cfce0c68c4f69cf2eca6286e7df087 100644
--- "a/\346\261\244\344\272\246\345\207\241/20220518-PHP\346\226\207\344\273\266\344\270\212\344\274\240\345\222\214\345\274\202\345\270\270\345\244\204\347\220\206.md"
+++ "b/\346\261\244\344\272\246\345\207\241/20220518-PHP\346\226\207\344\273\266\344\270\212\344\274\240\345\222\214\345\274\202\345\270\270\345\244\204\347\220\206.md"
@@ -30,14 +30,21 @@ if ($error==0){
     }else{
         echo "<br>";
         echo "文件上传成功";
+        echo "上传文件名: " . $_FILES['files']['name'] . "<br>";
+        echo "文件类型: " . $_FILES['files']['type'] . "<br>";
+        echo "文件大小: " . ($_FILES['files']['size'] / 1024/1024) . " m<br>";
+        echo "文件临时存储的位置: " . $_FILES['files']['tmp_name'];
         echo "<br>";
     }
+}else{
+    echo "错误：" . $_FILES['files']['error'] . "<br>";
+
 }
 $str=array("pdf","word");
 $name=$_FILES['files']['name'];
-$nameArr =explode(".",$name);
-$nameLast =end($nameArr);
-$result=in_array($nameLast,$str);
+$nameArr =explode(".",$name);//explode() 函数把字符串打散为数组。
+$nameLast =end($nameArr);//end()将数组内部指针指向最后一个元素，并返回该元素的值
+$result=in_array($nameLast,$str);//in_array()检查数组中是否存在的某个值
 if (!$result){
     echo "该文件不符合上传的类型";
 }else{
diff --git "a/\346\261\244\344\272\246\345\207\241/20220523-php\346\225\260\346\215\256\345\272\223\345\272\224\347\224\250.txt" "b/\346\261\244\344\272\246\345\207\241/20220523-php\346\225\260\346\215\256\345\272\223\345\272\224\347\224\250.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..5f32b408d0afa3db17534572597bc0f3309d49a5
--- /dev/null
+++ "b/\346\261\244\344\272\246\345\207\241/20220523-php\346\225\260\346\215\256\345\272\223\345\272\224\347\224\250.txt"
@@ -0,0 +1,30 @@
+```mysql
+-- Mysql���½���student���ݿ⣬�����и�ѧ����Ϣ��user�����ṹ����������
+CREATE DATABASE student CHARSET utf8;
+use student;
+CREATE table user(
+id int PRIMARY key auto_increment,
+name VARCHAR(20) not null,
+score DECIMAL(5,2) not null
+);
+INSERT into user VALUES (1,"��С��",98.5),(2,"����",75.5),(3,"�µ�ʤ",66);
+```
+```php
+<?php
+//���PHP�������ݿ��岽��ʹ��mysqli��չ��mysql���ݿ��е�ѧ����Ϣ��������ɾ�IJ顣
+//����ҵʱ��Ҫ��mysql��ش����phpһ���ύ
+error_reporting(E_ALL^E_WARNING);
+$a=mysqli_connect("127.0.0.1","root","123456","student")or die("����ʧ��".mysqli_connect_error());
+mysqli_query($a,"set names utf8");
+//$sql="update user set name='����֥' where id=3";
+//$result=mysqli_query($a,$sql) or die("�޸�ʧ��".mysqli_error($a));
+//$sel="select * from user";
+//$result=mysqli_query($a,$sel) or die("�޸�ʧ��".mysqli_error($a));
+//while($arr=mysqli_fetch_array($result)){//�ӽ�����з���һ��
+//    echo $arr['id']." ".$arr['name']." ".$arr['score']."<br>";
+//}
+$ins="insert into user values(4,'������',25.5)";
+$result=mysqli_query($a,$ins) or die("�޸�ʧ��".mysqli_error($a));
+$del="delete from user where id=3";
+$result=mysqli_query($a,$del) or die("�޸�ʧ��".mysqli_error($a));
+mysqli_close($a);