问题描述
我有一个特定的PHP脚本，该脚本调用exec()来执行将PDF转换为JPG的命令.此命令在bash中可以正常工作.
I have a certain PHP script that calls exec() to execute a command to convert a PDF to JPG. This command works fine in bash.
要避免您最初的疑难解答猜测，请注意以下几点:
To preempt your initial troubleshooting guesses, note the following:
- safe_mode =关闭
- 将包含PDF和脚本的目录的权限设置为777，并且该目录也是JPG的写入位置.
- 我传递给exec()的命令明确指向正在使用的二进制文件(例如/usr/local/bin/convert).
- display_errors =开启
- error_reporting = E_ALL
- disable_functions = [空白]
- 我正在回显exec()的输出，但不返回任何内容.默认情况下运行的命令不返回任何内容.
当我从浏览器中调用此PHP脚本时(访问 http://www.example.com/script .php )，exec()不会执行其参数.
When I call this PHP script from the browser (visiting http://www.example.com/script.php), exec() does not execute its argument.
重要:我知道我的脚本或bash命令的构造方式都没有问题，因为从bash中，我可以使用'php'执行脚本，并且脚本可以正常工作(例如'php script.php'转换文件)
IMPORTANT: I know that there are no issues with my script or the way I have constructed the bash command, because from bash, I can execute the script with 'php' and it works (e.g. 'php script.php' converts the file)
我还尝试过将exec()与system()交换出去.
I have also tried switching out exec() with system().
最后，我以前曾经遇到过这个问题，但是不记得我是如何解决的.
Last, I have had this issue once before in the past but cannot remember how I fixed it.
我知道我缺少一些东西，所以我希望其他人也能像我一样经历并记住如何解决！
I know there is something I am missing, so I hope someone else has experienced this as I have and remembers how to fix it!
在此先感谢您提供的任何帮助.
Thank you in advance for any assistance you can provide.
亚历克斯
推荐答案
在命令末尾添加2>&1以将错误从stderr重定向到stdout.这应该可以清楚地说明出了什么问题.
Add 2>&1 to the end of your command to redirect errors from stderr to stdout. This should make it clear what's going wrong.
这篇关于通过浏览器执行时，PHP exec()将不执行shell命令的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！