通过 exec() 调用的 PDFTK 无提示地失败
我正在使用 pdftk 通过以下方式动态连接 pdf 文件像这样的 exec() 调用：
exec("/path/to/pdftk /path/to/file1.pdf /path/to/file2.pdf cat output path/to/output.pdf", $execoutput);
这一切在 Linux 环境中都运行得很好，但是当在我们的开发环境（Windows/Uniform Server 和 OSX/MAMP 的混合）上本地运行时，这似乎会默默地失败。 $execoutput 是一个空数组。
如果发送到 exec() 的命令被复制并粘贴到 Windows 或 OSX 中的命令行，它将具有所需的输出并生成串联文件。每台开发人员机器都安装了 pdftk，并且可以通过命令行证明其功能齐全。
目前这让我很困惑。我无法解释为什么会发生这种情况。
I'm using pdftk to concatenate pdf files on the fly by making an exec() call like so:
exec("/path/to/pdftk /path/to/file1.pdf /path/to/file2.pdf cat output path/to/output.pdf", $execoutput);
This all works perfectly well in a linux environment, but when run locally on our development environments (a mix of Windows/Uniform Server and OSX/MAMP) this seems to silently fail. $execoutput is an empty array.
If the command that is sent to exec() is copy and pasted to the command line in either Windows or OSX it has the desired output and the concatenated file is generated. Each developer machine has pdftk installed and it can be demonstrated to be fully functional from the command line.
This currently has me stumped. I am at a loss to explain why this is happening.
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我终于明白发生了什么事。就像菜鸟一样，我假设每台机器都运行最新版本的 pdftk。他们不是。
看来上述问题与版本 1.43 中修复的已知错误有关
来自 http://www.pdflabs.com/docs/pdftk-version-history/
猜猜这是唯一运行版本 >= 1.43 的设置；-)
将每个开发环境更新到最新版本的 pdftk（当前为 1.44）已经解决了问题
I eventually figured out what was going on. Like a noob I had assumed every machine was running the latest version of pdftk. They weren't.
It would appear that the problem described above relates to a known bug which was fixed in version 1.43
From http://www.pdflabs.com/docs/pdftk-version-history/
Guess which was the only setup to be running a version >= 1.43 ;-)
Updating each development environment to the latest version of pdftk (currently 1.44) has solved the problem
如果 pdftk 没有将输出添加到所需文件夹的权限，也可能会发生这种情况。如果打印 $execoutput （命令中带有“verbose”）并看到最后一个条目将是“Creating Output”，您可以看到这种情况发生。下一行应该说输出正在执行，但它只会在那里结束。这让我呆了一段时间（因为如果你直接在命令行上运行它就可以工作）。
This can also occur if pdftk does not have permission to the add the output to the desired folder. You can see this happening if you print out the $execoutput (with 'verbose' in the command) and see that the last entry will be 'Creating Output'. The next line should say that the output is being executed, but it will just end there. This got me for awhile (as it works if you run directly on the command line).