Problem starting a PHP background process

Question

I have recently created a script that needs to be run on background.. I use this code to run it...

function run_in_background($Command, $Priority = 0) {
   if($Priority)
       $PID = exec("nohup nice -n $Priority $Command 2> /dev/null & echo $!");
   else
       $PID = exec("nohup $Command 2> /dev/null & echo $!");
   return($PID);
}

and use it like this

run_in_background('curl http://www.mydomain.com/mypage.php',5);

Unfortunately, it is not running on background...

I have also used:

shell_exec

instead of

exec

But it still doesn't work.. Is there something wrong with my setup?..

Note: it doesn't run in background but it sure runs when the page is loaded...

thanks in advanced..

please be very careful with this function, and clearly document how to use it properly. if users can control the value of $Command or $Priority, then you have a command injection vulnerabiliity. attackers will be able to execute commands on your web server os with the same permissions under which php runs. — atk, Jan 11 '11 at 05:39

score 0 · Answer 1 · edited May 23 '17 at 11:54

0

Place a & at the end of your command to tell the shell to run the process in the background.

$PID = exec("nohup nice -n $Priority $Command 2> /dev/null & echo $! &");

I also asked and answered a similar question you could look over that may help you: How can I run a PHP script in the background after a form is submitted?

edited May 23 '17 at 11:54

Community

1
1

answered Jan 11 '11 at 05:36

Michael Irigoyen

22,513
17
89
131

score 0 · Answer 2 · edited May 23 '17 at 11:54

0

Please see this answer, seems to be exactly what you are looking for:

php execute a background process

edited May 23 '17 at 11:54

Community

1
1

answered Jan 11 '11 at 09:20

Or Weinberger

7,332
23
71
116

Problem starting a PHP background process

2 Answers2