从PHP在后台运行Shell脚本

Question

The scenario:

1. I have a PHP script (accessed via the web) which generates a shell script which needs to continue to run even after the request ends.
2. I need the output sent to a file on disk (ie "./script.sh > run.log")

Every approach I try seems to result in PHP still waiting for the shell script to finish executing. Approaches I've tried:

1. nohup ./script.sh > run.log &
2. nohup ./script.sh > run.log 2>&1
3. nohup ./script.sh > run.log 2>&1 &
4. ./script.sh &
5. ./script.sh > run.log 2>&1
6. ./script.sh > run.log &

I think there's something really obvious I might be missing. Any ideas?

Answer 1

我认为您可以通过使用脚本启动screen实例来实现此目的：

screen -d -m 'bash ./script.sh > run.log'

Answer 2

Have you tried shell_exec ?

You might be interested in this post : Is there a way to use shell_exec without waiting for the command to complete?

Answer 3

Your number 5 approach is close but you need to combine it with 6 like this

shell_exec("/script.sh > run.log 2>&1 &");

Or redirect to /dev/null like this

shell_exec("/script.sh > /dev/null 2>/dev/null &")

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It appears that the PHP development server cannot fork off commands properly. Using a real web server like Apache or NGinx will resolve the issue.