PDFTk适用于本地但不在私有服务器上工作

问题描述：

I have private server CentOS 6 and I have installed pdftk program to generate pdf files. When I connect with SSH client, I can run pdftk program successfully. But I couldn't in php with exec() function.

I have a very simple php file as shown below. This is only to test if pdftk is working or not. When I ran this file on my localhost with xampp, it generates the file but when I tried on my private server, not gives error and not generates the file. I am not expert and expecting any help from you. Thanks in advance.

PHP CODE:

<?php
exec("pdftk form.pdf output private.pdf");

The error look like this:

Array ( [0] => Error: Failed to open output file:
  [1] => collated.pdf [2] => No output created.)

Note: I have tried this code on putty ssh client and works perfectly.

我有私人服务器CentOS 6，我安装了pdftk code>程序来生成pdf文件。当我连接SSH客户端时，我可以成功运行pdftk程序。但我无法在 php code>中使用 exec（） code>函数。 p>

我有一个非常简单的php文件，如下所示。这只是为了测试pdftk是否正常工作。当我使用xampp在我的localhost上运行此文件时，它会生成该文件，但是当我尝试使用我的私有服务器时，不会出错并且不会生成文件。我不是专家，期待你的任何帮助。在此先感谢。 p>


 PHP代码： p> 
 
 
 ＆lt;？php 
exec（“pdftk form.pdf output private.pdf”）  ; 
  code>  pre> 
 
 错误如下所示： p> 
 
 
  Array（[0] =＆gt;错误：失败 打开输出文件：
 [1] =＆gt; collated.pdf [2] =＆gt;没有创建输出。）
  code>  pre> 
 
 注意：我试过这段代码 在putty ssh客户端上并且工作得很好。 p> 
  div>

答

The error is: Array ( [0] => Error: Failed to open output file: [1] => collated.pdf [2] => No output created. . same exec code on putty works fine.

The difference you can spot is in the user running the code. In case of PuTTY, you are logged in as a different user than the user who is running your script when accessed from web. Since you are creating a new file, the user needs a write access to the directory, where you are. This is generally a bad idea to allow to write that user to the directory, where your scripts are so it is a good idea to create a new directory (such as export), where the apache user will have access to write:

mkdir export
chown apache:apache export
chmod 755 export

and modify your script to write a file into that directory:

exec("pdftk form.pdf output export/private.pdf");

PDFTk适用于本地但不在私有服务器上工作

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