如何在PHP中创建取消链接按钮

I have a PHP script where you can upload files. These files get listed, and are converted to a download link. The last thing that I need is a delete button for each list item. Like so

我有一个PHP脚本,您可以上传文件。这些文件将被列出,并转换为下载链接。我需要的最后一件事是每个列表项的删除按钮。像这样

test.txt X

(The large X should be a delete button).

(大X应该是删除按钮)。

This is my code so far.

到目前为止这是我的代码。

<?php

  if(isset($_FILES['file_array'])){
    $name_array = $_FILES['file_array']['name'];
    $tmp_name_array = $_FILES['file_array']['tmp_name'];
    $type_array = $_FILES['file_array']['type'];
    $size_array = $_FILES['file_array']['size'];
    $error_array = $_FILES['file_array']['error'];
    for($i = 0; $i < count($tmp_name_array); $i++){
        if(move_uploaded_file($tmp_name_array[$i], "uploads/".$name_array[$i])){
        } else {
            echo "move_uploaded_file function failed for ".$name_array[$i]."<br>";
        }
    }
  }


   $thelist = "";
   if ($handle = opendir('uploads')) {
       while (false !== ($file = readdir($handle))) {
           if ($file != "." && $file != "..") {
              $thelist .= '<li><a download="'.$file.'"href="uploads/'.$file.'">'.$file.'</a></li>';
           }
      }
    closedir($handle);
  }
?>

<h1>List:</h1>
<ul><?php echo $thelist; ?></ul>

Im quite new with PHP, so I that hope someone can explain me how it works in easy language.

我是PHP的新手,所以我希望有人能用简单的语言解释它是如何工作的。

3 个解决方案

#1

The last thing what I need is a delete button for each list item

我需要的最后一件事是每个列表项的删除按钮

Post the value via a form:

通过表格发布价值:

<form method="post" action="delete.php">
  <button type="submit" name="file_id" value="some_value">&times;</button>
</form>

And then in delete.php, reference $_POST['file_id'].

然后在delete.php中,引用$ _POST ['file_id']。

Another method is to wrap your while loop in the form:

另一种方法是在表单中包装while循环:

<form method="post" action="delete.php">
  <?php while(...): ?>
    <button type="submit" name="file_id" value="some_value">&times;</button>
  <?php endwhile; ?>
</form>

#2

You may add the X link for referencing the file to be deleted i.e.

您可以添加X链接以引用要删除的文件,即

$thelist .= '<li><a download="'.$file.'"href="uploads/'.$file.'">'.$file.'  </a> <a href="delete.php?item='.$file.'"> X </a></li>';

Then on your delete page you may add the unlink code to delete your file

然后在删除页面上添加取消链接代码以删除文件

$file = $_GET['item'];
if (!unlink($file))
  {
  echo ("Error deleting $file");
  }
else
  {
  echo ("Deleted $file");
}

This is the basic idea of how to go about it. But to be safe you may encrypt the url file name on the parameter i.e.

这是如何实现它的基本思路。但为了安全起见,您可以加密参数上的url文件名,即

base64_encode($file)

And on the delete page you decode it

在删除页面上解码它

base64_decode($_GET["item"])

#3

In order to create a request for deleting the item, you can for instance:

为了创建删除项目的请求,您可以例如:

<form action="delete.php" method="POST">
  <input type="hidden" name="csrf_token" value="$csrf_token">
  <input type="hidden" name="file" value="$file">     
  <button type="submit">X</button>
</form>

Basically $csrf_token is a secure random token which is tied to the session, which the server should validate before processing the delete request. (Updated regarding CSRF security concerns @PeeHaa mentioned.) (You can use method DELETE if you support it.)

基本上$ csrf_token是一个安全随机令牌,它与会话相关联,服务器在处理删除请求之前应该验证该会话。 (有关CSRF安全问题的更新@PeeHaa提到。)(如果您支持,可以使用方法DELETE。)

#1