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@@ -0,0 +1,44 @@
+```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";}
+}
+```
+
