php 使用php强制下载pdf
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Using php to force download a pdf
提问by Craig Traynor
Im trying to get a website to have a button that forces a download of a pdf.
我试图让一个网站有一个按钮来强制下载 pdf。
Heres the html of the button:
这是按钮的html：
<a href=scripts/download.php>
<input type="image" src="images/download.gif" alt="Submit button"/>
</a>
And the php script so far:
到目前为止的 php 脚本：
<?php
header('Content-Type: application/pdf');
header('Content-disposition: attachment;filename=documents/ECM_IT_ResumeDownload.pdf');
readfile('documents/ECM_IT_ResumeDownload.pdf');
?>
This seems to download the file fine but when I go to open it i get this error:
这似乎可以很好地下载文件，但是当我打开它时出现此错误：
"Adobe Reader could not open 'documents_ECM_IT_ResumeDownload.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded)."
“Adobe Reader 无法打开‘documents_ECM_IT_ResumeDownload.pdf’，因为它不是受支持的文件类型，或者因为文件已损坏（例如，它作为电子邮件附件发送并且未正确解码）。”
Any help would be greatly appreciated.
任何帮助将不胜感激。
EDITOpened the pdf in a text editor and got this message:
编辑在文本编辑器中打开 pdf 并收到以下消息：
"
Warning: readfile(documents/ECM_IT_ResumeDownload.pdf) [function.readfile]: failed to open stream: No such file or directory in html/scripts/download.phpon line 4
"
“
警告：readfile（documents/ECM_IT_ResumeDownload.pdf）[function.readfile]：无法打开流：在第4行的html/scripts/download.php 中没有这样的文件或目录
”
The document is definitely there though. in html/documents/ECM_IT_ResumeDownload.pdf
文件肯定在那里。在 html/documents/ECM_IT_ResumeDownload.pdf
采纳答案by abelito
Have you tried getting rid of the closing PHP tag (the ?>) at the end? It will treat the page as a pure PHP page, removing any possible new lines that might accidentally get appended to the end of the output. This helped me when I was dynamically creating excel files for download, and they were downloading as corrupted. Check out this page for more information:
您是否尝试在最后去掉 PHP 结束标记（?>）？它会将页面视为纯 PHP 页面，删除任何可能意外附加到输出末尾的新行。当我动态创建要下载的 excel 文件时，这对我有所帮助，并且它们下载时已损坏。查看此页面了解更多信息：
http://www.php.net/manual/en/language.basic-syntax.phptags.php
http://www.php.net/manual/en/language.basic-syntax.phptags.php
From your edited question, it seems like PHP is unable to find the file. Try using an absolute path to the file like so: "c:\blah\de\blah\bloo.pdf" or "c:/blah/de/blah/bloo.pdf". If one of those paths works and downloads correctly, your relative path is incorrect in some way.
从您编辑的问题来看，PHP 似乎无法找到该文件。尝试使用文件的绝对路径，如下所示：“c:\blah\de\blah\bloo.pdf”或“c:/blah/de/blah/bloo.pdf”。如果这些路径之一工作并正确下载，则您的相对路径在某种程度上是不正确的。
回答by Mohammad Intsar
$file_url = www.example.com/pdffolder/$pdfname;
header('Content-Type: application/pdf');
header("Content-Transfer-Encoding: Binary");
header("Content-disposition: attachment; filename=".$pdfname);
readfile($file_url);
回答by John Conde
Try removing the path to the file and just leave the file name in the content:
尝试删除文件的路径，并在内容中保留文件名：
header('Content-Type: application/pdf');
header('Content-disposition: attachment; filename=ECM_IT_ResumeDownload.pdf');
回答by FluffyKitten
I always use Gowon Patterson's download script, it also has hotlink protection: http://by.gowondesigns.com/getfile/
我总是使用 Gowon Patterson 的下载脚本，它也有防盗链保护：http: //by.gowondesigns.com/getfile/
回答by M Miller
By the way, a bit late, but to identify the problem properly here:
顺便说一句，有点晚了，但要在这里正确识别问题：
Your download script is at scripts/download.phpand the file you want to download is at documents/[...].pdf.
您的下载脚本位于scripts/download.php，您要下载的文件位于documents/[...].pdf。
Therefore, your readfile()function should be traversing to the parent directory (outside of scripts/), e.g. readfile('../documents/[...].pdf');.
因此，您的readfile()函数应该遍历父目录（在 之外scripts/），例如readfile('../documents/[...].pdf');.
