php 使用浏览器提示下载文件
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using the browser prompt to download a file
提问by Ed Cohen
I have a php/mysql site in which I am trying to download a comma delimited file (CSV). The csv file I create contains comma delimited data (name, address, city, state). I create the csv file ok and place it in the site's /downloads directory. So far so good. I have been looking on line and the code to trigger the browser's download prompt that I see the most often is:
我有一个 php/mysql 站点，我试图在其中下载逗号分隔文件 (CSV)。我创建的 csv 文件包含逗号分隔的数据（名称、地址、城市、州）。我创建了 csv 文件，并将其放在站点的 /downloads 目录中。到现在为止还挺好。我一直在网上找，我最常看到的触发浏览器下载提示的代码是：
$path = $_SERVER['DOCUMENT_ROOT'];
$exportfile = "emailclientaddresses.csv";
$fullpath = "downloads/" . $exportfile;
header("Content-type: text/plain");
header("Content-Length: ".filesize($exportfile));
header("Content-Disposition: attachment; filename=" . $fullpath);
The $exportfile is the csv file that my code created. It's ok. What this does is:
$exportfile 是我的代码创建的 csv 文件。没关系。它的作用是：
- The $fullpath is displayed in the browser download prompt in a very weird format: download_emailclientaddresses.csv
- When it does download, the current webpage is downloaded or a combination of the csv file and the current web page.
- $fullpath 以一种非常奇怪的格式显示在浏览器下载提示中：download_emailclientaddresses.csv
- 下载时，会下载当前网页或 csv 文件和当前网页的组合。
OK, I have tried a lot of things and nothing has worked. So, if anyone can help me I would appreciate it. Thank you.
好吧，我已经尝试了很多东西，但没有任何效果。所以，如果有人能帮助我，我将不胜感激。谢谢你。
ed Cohen
埃德·科恩
回答by Anne
The PHP documentationprovides a nice example:
在PHP文档提供了一个很好的例子：
<?php
$file = 'monkey.gif';
if (file_exists($file)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
exit;
}
?>
EDIT(Response to comment, explanation)
编辑（对评论的回应，解释）
header('Content-Description: File Transfer');
Do not display in the browser, but transfer the file.
不在浏览器中显示，而是传输文件。
header('Content-Type: application/octet-stream');
header('Content-Transfer-Encoding: binary');
File is a binary file.
Browsers generally download binary files, unless they can display them.
文件是一个二进制文件。
浏览器通常下载二进制文件，除非它们可以显示它们。
header('Content-Disposition: attachment; filename='.basename($file));
Make the download dialog show the proper file name.
Note: You can use any file name.
使下载对话框显示正确的文件名。
注意：您可以使用任何文件名。
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
File should not be cached by the browser.
Cache could cause trouble in case of dynamic content.
文件不应被浏览器缓存。
如果是动态内容，缓存可能会导致问题。
header('Content-Length: ' . filesize($file));
Send the correct file size to the browser,
otherwise the browser is unable to estimate the transfer-time.
将正确的文件大小发送到浏览器，
否则浏览器无法估计传输时间。
ob_clean();
flush();
Make sure the headers are send to the browser before the download starts.
确保在下载开始之前将标题发送到浏览器。
readfile($file);
Send the file to the browser.
将文件发送到浏览器。
exit;
Done :)
完毕 ：）
