Question

如果文件成功下载，如何从用户删除文件？我这里有一个下载功能，但我不知道如何进行一次下载。

使用PHP的HTML代码：

<?php 
                    $result=mysql_query("SELECT * FROM school_management");
                    while($row=mysql_fetch_array($result))
                    {
                ?>
                    <div class="col-xs-6 col-md-3" style="padding-bottom: 10px;">
                        <div class="thumbnail">
                          <img src="images/ebooks/<?php echo $row['PICTURE'];?>" alt="...">
                        </div>
                        <p><center><a href="files/file.php?file=<?php echo $row['FILE_NAME'];?>" class="btn btn-xs btn-inverse" role="button" style="background-color: #2980b9;">Download</a></center></p>
                    </div>
                <?php
                    }
                ?>

file.php

<?php

include('config.php');

$file=$_GET['file'];
echo $file;
header("Content-disposition: attachment; filename=$file");
header("Content-type: application/pdf");
header('Content-Description: File Transfer');
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
readfile("$file");

?>

我的file.php只能下载标题中带有字母的文件，但如果文件中有符号或数字，我就无法下载该文件。所以我为我改变了所有的pdf标题，以便能够下载它。任何使我的file.php下载正确的建议，如果用户成功下载文件，该文件将从用户的数据库中删除。

数据库名称：caledte1_ebook

表名：school_management

表格列：ID_NUMBER，EBOOK_FILENAME，PICTURE

Answer 1

只需在file.php中进行数据库调用即可。您可能还希望在交付文件之前验证该文件是否存在。

$filename = mysql_real_escape_string($_GET['file']);
$result = mysql_query("SELECT id_number FROM school_management WHERE ebook_filename = '$filename'");
if(mysql_num_rows($result) == 0) {
    // Perform error handling
}
mysql_query("DELETE FROM school_management WHERE ebook_filename = '$filename'");

Answer 2

新的PHP / HTML文件：

<?php

$dbhost = ""; //Enter db host here
$dbuser = ""; //Enter db user here
$dbpass = ""; //Enter db pass here
$dbname = ""; //Enter db name here

$db = new mysqli($dbhost, $dbuser, $dbpass, $dbname);

/* check connection */
if ($db->connect_errno) {
    printf("Connect failed: %s\n", $db->connect_error);
    exit();
}

$sql = "SELECT * FROM school_management";

if ($result = $db->query($sql)){
    while ($row = $result->fetch_assoc()){ ?>
        <div class="col-xs-6 col-md-3" style="padding-bottom: 10px;">
            <div class="thumbnail">
                <img src="images/ebooks/<?php echo $row['PICTURE'];?>" alt="...">
            </div>
            <p>
                <center>
                    <a href="files/file.php?file=<?php echo $row['FILE_NAME']; ?>" class="btn btn-xs btn-inverse" role="button" style="background-color: #2980b9;">Download</a>
                </center>
            </p>
        </div>
    <? }

    $result->free();

} else {
    printf("Error: %s\n", $db->error);
}

$db->close();

?>

File.php：

<?php

$dbhost = ""; //Enter db host here
$dbuser = ""; //Enter db user here
$dbpass = ""; //Enter db pass here
$dbname = ""; //Enter db name here

$db = new mysqli($dbhost, $dbuser, $dbpass, $dbname);

/* check connection */
if ($db->connect_errno) {
    printf("Connect failed: %s\n", $db->connect_error);
    exit();
}

$file = $_GET['file'];

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/pdf');
    header('Content-Disposition: attachment; filename='.basename($file));
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    readfile($file);

    $file = $db->real_escape_string($file);

    $sql = "DELETE FROM school_management WHERE ebook_filename = '". $file ."'";

    if ($succes = $db->query($sql)){
        //Succesfull deleted code handle here
    } else {
        printf("Error: %s\n", $db->error);
    }

    $db->close();
}

?>

当然你可以从中获取mysqli（）连接部分并使用单独的文件。

如何创建下载后将从数据库中删除的文件下载

2 个答案: