PHP CLI脚本不输出任何内容 [英] PHP cli script does not output anything

问题描述

所以我有一个使用以下命令执行的php脚本:

So I have a php script which I execute using the following command:

php -f my_script.php myArguments

该脚本受使用svn的版本控制.我刚刚对其进行了更新，将要运行的命令粘贴到终端中，然后执行了它.但是，没有输出.不是失败消息，不是打印任何内容，什么也不做.看来它永远不会开始.有点像以下内容:

The script is under version control using svn. I just updated it, pasted the command to run it into a terminal, and executed it. However, there is no output. Not a failure message, not it printing anything, nothing. It looks like it never starts. Kind of like the following:

me:/srv/scripts# php -f my_script.php myArguments
me:/srv/scripts#

其他脚本可以正常运行.

Other scripts will run just fine.

我很难提出一个SSCCE，因为我无法真正共享导致此问题的代码，而且我也无法有意地复制此行为.但是，我已经两次看到了这一点.如果我保存所做的更改，还原文件，然后将其粘贴回，则很有可能正常运行.

It is difficult for me to come up with an SSCCE, as I can't really share the code that is causing this, and I haven't been able to replicate this behavior intentionally. I have, however, seen this twice now. If I save my changes, revert the file, and paste them back in, there is a strong chance it will run just fine.

但是，我担心不知道是什么导致了这种奇怪的行为.是否存在空格字符或告诉PHP无法启动或输出任何内容的字符?

However, I am concerned by not knowing what is causing this odd behavior. Is there a whitespace character or something that tells PHP not to start, or output anything?

这是我看到这种行为后尝试过的方法:

Here is what I've tried after seeing this behavior:

• 修改脚本，使其很简单echo 'hello'

在脚本的开头放置废话，所以它是不可解析的.

Putting nonsense at the beginning of the script, so it is unparseable.

从工作脚本中粘贴代码

沮丧地将我的头撞在墙上

Banging my head on a wall in frustration

在另一个终端/putty ssh连接中尝试.

Trying it in another terminal/putty ssh connection.

在这里变得很有趣:它实际上在另一个终端中正常工作.它按预期完成所有操作.

Here's where it gets interesting: It actually works in a different terminal. It does everything as expected.

那么，有谁知道这可能是什么原因，或者我应该尝试以确定问题的方式?

So does anyone have any ideas what might be causing this, or things I should try in order to determine the problem?

不同的终端"仍然是终端应用程序，只是一个新的应用程序.

The "different terminal" is still the terminal application, just a new one.

我具有执行该文件的足够权限，但是即使我没有执行该文件，它也应该吐出一条消息，说我没有.

I have sufficient permissions to execute the file, but even if I didn't, it should spit out a message saying I don't.

我有意引入了语法错误，希望我能使PHP吐出一个解析错误.仍然没有输出.

I intentionally introduced syntax errors in hopes that I would get PHP to spit out a parse error. There was still no output.

推荐答案

-d开关:

display_errors might be disabled before runtime. You can turn it on manually with the -d switch:

php -d display_errors=1 -f my_script.php myArguments

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