diff --git "a/\345\220\264\346\265\267\346\266\214/20220518-php\346\226\207\344\273\266\344\270\212\344\274\240.md" "b/\345\220\264\346\265\267\346\266\214/20220518-php\346\226\207\344\273\266\344\270\212\344\274\240.md"
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@@ -0,0 +1,60 @@
+### 笔记
+
+```php
+define('size',1024*1024);//define 如果成功则返回 true ，失败则返回false 默认是true
+$b = $_files['f']['size'];//把文件赋值给b
+
+if($b<size)//在大小合适的情况下，判断文件的后缀名是否相同
+$array = array ('docx','jpg')://定于一一个数组来装后缀名，允许上传的类型
+
+
+```
+
+### 作业
+
+
+
+```php
+// 1、实现一个文件上传，限制只能上传pdf和word格式，大小为1M以内。
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>提交</title>
+</head>
+<body>
+    <form action="demo03.php" method="post" enctype="multipart/form-data">
+
+        请输入你要传输的文件：<input type="file" name="f">
+        <br>
+        <input type="submit" value="提交">
+
+    </form>
+</body>
+</html>
+```
+
+```php
+<?php
+print_r($_FILES);
+$error = $_FILES['file']['error'];
+if ($error==0){
+    define("SIZE",1024*1024);
+    $size = $_FILES['file']['size'];
+    if ($size>SIZE){
+        echo "上传文件太大了！";
+    }else{
+        echo "上传文件太小了！";
+    }
+    $array = array("pdf","docx");
+    $name =  $_FILES['file']['submit'];
+    $nameArr = expllode("".",$name");
+    $lastname = $nameArr[count($nameArr)-1];
+    $result = array_search($lastname,$array);
+    if ($result===false){
+        echo "上传文件格式错误！";
+    }else{
+        echo "上传文件格式正确";}
+}
+```
+
