Question

创建一个应该展示几个不同电视节目的小网站。我有一个页面，应该允许用户输入新的电视节目名称和电视节目的图片。

由于某种原因，我在行上获得了未定义的索引错误：41,44,45和52.代码如下：

<form action="upload.php" method="POST" enctype="multipart/form-data">
    Programme Title: <input type="text" name="title">   </br> 
    Select photo to upload:<input type="file" name="photo" id="photo">  <br/>
    <input type="submit" value="Upload" name="submit">
</form>

<?php

 //This is the directory where images will be saved 
 $target = "images/"; 
 $target = $target . basename( $_FILES['photo']['name']);  --- ERROR line 41 

 //This gets all the other information from the form 
 $title=$_POST['name']; --- ERROR line 44
 $pic=($_FILES['    ']['name']);  --- ERROR line 45


 //Writes the information to the database 
 mysqli_query($mysqli, "INSERT INTO programmes VALUES ('', '$title', '', '$pic')") ; 

 //Writes the photo to the server 
 if(move_uploaded_file($_FILES['photo']['tmp_name'], $target))  --- ERROR line 52
 { 

 //Tells you if its all ok 
 echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded, and your information has been added to the directory"; 
 } 
 else { 

 //Gives and error if its not 
 echo "Sorry, there was a problem uploading your file."; 
 } 

 ?>

错误消息：

未定义的索引：C：\ wamp \ www \ sky_coding \ upload.php中的照片在线 45,49和55未定义的索引：标题第48行的C：\ wamp \ www \ sky_coding \ upload.php

请帮忙我很困惑，不知道为什么我得到这个错误

任何信息都会有所帮助谢谢！

Answer 1

您从未打扰过检查表单是否已提交，或文件是否已上传。您只是无条件地执行表单处理代码。

至少你需要这样的东西：

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
   // form was submitted
   if (isset($_FILES['photo'])) {
         if ($_FILES['photo']['error'] === UPLOAD_ERR_OK) {
              ... file was successfully uploaded, process it
         } else {
              die("File upload failed with error " . $_FILES['photo']['error']);
         }
   }
   etc... etc... etc...
}

您也容易受到sql injection attacks的攻击，并且只是假设数据库查询永远不会失败。

Answer 2

您在帖子中访问了name，但它应该是您在表单代码中提供的title

 $title=$_POST['title'];this should be title

您要离开空索引，因此请将索引添加为photo

 $pic=($_FILES['photo']['name']); you have not added any index here.

未定义的索引不确定原因

2 个答案: