Question

好的我有一个页面，用户上传的文件如下所示：

upload.php的：

<form enctype="multipart/form-data" action="upload_file.php" method="POST">
Choose a file to upload: <input name="uploaded" type="file" /><br />       
<input type="submit" value="Upload File" />     
</form>

upload_file.php：

<?php   
$target = "upload/";    
$target = $target . basename( $_FILES['uploaded']['name']) ;   
$ok=1;    
$uploaded_type= $_FILES['uploaded']['type'];  
$uploaded_size= $_FILES['uploaded']['size'];  

//This is our size condition   
if ($uploaded_size > 350000)    
{    
echo "Your file is too large.<br>";    
$ok=0;   
}   

//This is our limit file type condition   
if ($uploaded_type =="text/php")    
{     
echo "No PHP files<br>";     
$ok=0;     
}     

//Here we check that $ok was not set to 0 by an error      
if ($ok==0)       
{       
Echo "Sorry your file was not uploaded";      
}      

//If everything is ok we try to upload it      
else       
{       
if(move_uploaded_file($_FILES['uploaded']['tmp_name'], $target))       
{      
echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded";      
}      
else     
{     
echo "Sorry, there was a problem uploading your file.";     
}     
}      
?>

每当我测试它时，网页就会返回此

注意：未定义的索引：在第3行的 \ htdocs \ upload_file.php 上传 注意：第7行的 \ htdocs \ upload_file.php 中的未定义变量：uploaded_size
注意：未定义的变量：第14行的 \ htdocs \ upload_file.php 中的uploaded_type 注意：未定义的索引：在第29行的 A：\ xampp \ htdocs \ upload_file.php 中上传

有人可以告诉我这里我做错了什么。对不起，如果它是一个非常简单的修复。
提前谢谢！

Answer 1

这里有几个问题。很多小新手程序员的东西，但我做了一些清理工作。最令人震惊的问题是使事情难以阅读的基本格式。所以我清理了一下。另外，我在脚本的开头设置了一个检查，它将进行一项非常基本的检查，看看是否设置了$_FILES['uploaded']。此外，您还有一个名为$ok的变量，用于执行基本的TRUE / FALSE检查。我将其调整为实际的TRUE / FALSE值。

另外，您的专栏内容为：

echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded";

没有任何意义，因为脚本的其余部分引用了$_FILES['uploaded']。所以我也纠正了这一点。

现在已经过了所有这些，当您在脚本中执行基本变量转储时会出现这样的情况：

echo '<pre>';
print_r($_FILES);
echo '<pre>';

这将向您展示$_FILES数组中的实际内容，以便更轻松地进行调试。哎呀，我用一个基本的TRUE / FALSE开关添加到脚本中，以便您快速启用它。在需要时关闭。

<?php

if (TRUE) {
  echo '<pre>';
  print_r($_FILES);
  echo '<pre>';
}

$ok = TRUE;    

// Check if there is an uploaded file.
if (!array_key_exists('uploaded', $_FILES) && !empty($_FILES['uploaded'])) {
  echo "Sorry, no file seems to be uploaded.";
  $ok = FALSE; 
}

$target = "upload/";    
$target = $target . basename($_FILES['uploaded']['name']) ;   
$uploaded_type = $_FILES['uploaded']['type'];  
$uploaded_size = $_FILES['uploaded']['size'];  

// This is our size condition.  
if ($uploaded_size > 350000) {    
  echo "Your file is too large.<br>";    
  $ok = FALSE;   
}   

//This is our limit file type condition   
if ($uploaded_type =="text/php") {     
  echo "No PHP files<br>";     
  $ok = FALSE;     
}     

// Here we check that $ok was not set to 0 by an error      
if ($ok) {       
  echo "Sorry your file was not uploaded";      
}
// If everything is ok we try to upload it      
else {       
  if (move_uploaded_file($_FILES['uploaded']['tmp_name'], $target)) {      
    echo "The file ". basename( $_FILES['uploaded']['name']). " has been uploaded";      
  }      
  else {     
    echo "Sorry, there was a problem uploading your file.";     
  }     
}      
?>

PHP文件上传无法使用$ _FILES变量，它始终未定义

1 个答案: