如何在PHP中创建动态下载链接 [英] How to create Dynamic Download Link in PHP
问题描述
有没有一种方法可以在PHP中为单个文件创建一段时间的动态下载链接，或者该下载链接在该时间之后失效。在此之后，下载链接会更改。
Is there a way we can create a dynamic download link in PHP for a single file for some period of time or the download link expires after that time. After that period the download link changes.
实际上，我有一个要求，即只能通过特定电子邮件访问下载链接。由于文件的大小，我无法将其添加为附件。
Actually I have a requirement where the download link should be accessible only through a particular email. I can't add that file as an attachment because of its size.
有人可以帮我吗？
推荐答案
一个解决方案：
-
创建一个数据库表，该表存储一个很大的唯一值ID（随机），以及要下载的文件的名称/位置/内容。
Create a Database table which stores a large unique ID (random), and the name/location/content of the file to download. Also include an expire date.
id | filename | expires
----------------------+--------------------+--------------------
fsdhfs7dfsniuf92un3f2 | secret.doc | 2012-03-23 23:32:32
sdf8shdf829nf32ufn23f | secret2.doc | 2012-03-13 23:32:33
通过电子邮件将链接发送给最终用户。 ..链接应该类似于：
Email a link to your end user... The link should be something like:
http://yoursie.com/download/fsdhfs7dfsniuf92un3f2
使用apache重写规则（mod_rewrite），它将捕获美观的链接并将其传递到PHP页面：
Use an apache rewrite rule (mod_rewrite) which will capture the nice looking link and pass it to a PHP page:
RewriteEngine on
RewriteRule ^/download/([a-z0-9]{20})$ /download.php?id=$1
在该脚本中， download.php ，请查看 $ _ GET ['id'] 。运行数据库查询以查找记录。检查到期日期。如果一切正常，请继续。
In that script, download.php, look at $_GET['id']. Run a database query to look up the record. Check the expiration date. If all is OK, then proceed.
要么使用PHP脚本输出正确的标头并下载文件，要么将内部重定向发送到前端终端代理（例如nginx），它将把下载过程卸载到nginx上，而不会将PHP与下载捆绑在一起。
Either use the PHP script to output the correct headers and download the file, or send an internal redirect to a front-end proxy like nginx, which will offload the download process to nginx and not tie up PHP with the download.
无论哪种方式，您都有一个安全的，可过期的链接，可以将其发送给最终用户。
Either way, you have a secure, expireable link that you can send to your end users.
保重！
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