php background process using exec function

Question

I have searched a lot to find the exact answer but didn't find any.

many people mentioned that we should & at end of command to don't wait for response.
for example to run bg.php in background , this was recommended:

exec("/usr/bin/php bg.php &");

but it doesn't work for me. and the main script waits for complete execution of the bg.php.

I also read somewhere to write bg.php output in a logfile but my background script doesn't produce any output. It does some process and then write something in database.

I just want my script to run bg.php and don't wait for it to end.

please help me including correct code.

ninaj · Accepted Answer · 2012-10-11 15:11:04Z

23

You have to reroute programs output somewhere too, usually /dev/null

exec($cmd . " > /dev/null &");

answered Oct 11, 2012 at 15:11

ninaj

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2 Comments

Aliweb Over a year ago

works fine! but what is /dev/null directory? does this command write the output to a file?

ninaj Over a year ago

/dev/null just discards the data sent to it, you can alternatively route it to some file if you need the program output

moodboom · Accepted Answer · 2015-10-11 00:22:05Z

1

Have you considered using screen? You can start up a screen session that runs in a detached process.

screen -d -m -S my_bg_session /usr/bin/php bg.php

Then you can connect to it later if it is still running:

screen -r my_bg_session

answered Oct 11, 2015 at 0:22

moodboom

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