Executing a background process in PHP on Windows

Question

I'm rewriting Mark's answer for Windows and so far I've come up with this:

 // Escape character for Windows is: ^ 
 $shellCmd = 'start /B cmd /c ' . escapeshellcmd($cmd) . ' ^>"'.$outputfile. '"'; 
 // note that exec was like 40 times slower than popen & pclose 
 pclose(popen($shellCmd, "r"));

There's tasklist command on Windows but I don't know how to find out the PID of my process. To be punctual I'm looking for PID of the process that is opened via popen.

Can you help me? Thanks!

Note: I'm not sure what this code does with error output but in my case it doesn't matter.

I'm looking for PID of the process that is opened via popen. — MartyIX
– MartyIX, Commented Aug 7, 2011 at 13:32
You should add that as the first sentence of your question :) — hakre
– hakre, Commented Aug 7, 2011 at 13:51

Marek Sebera · Accepted Answer · 2011-08-07 14:26:27Z

2

http://php.net/manual/en/function.proc-open.php
http://php.net/manual/en/function.pcntl-fork.php
http://www.php.net/proc_get_status

read discussion under these functions and you can get more control over background processes and retrieve their PIDs

example like this:

$pcs = popen($shellCmd,"r");
$info = proc_get_status($pcs);
$pid = $info['pid'];
proc_close($pcs);

edited Aug 7, 2011 at 14:26

answered Aug 7, 2011 at 13:33

Marek Sebera

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4 Comments

MartyIX Over a year ago

I've already read php.net/manual/en/function.proc-open.php#90584 but it is not kind of portable solution.

MartyIX Over a year ago

You should use proc_open and proc_close. This snippet returns warning: supplied resource is not a valid stream resource. I'll add working code when I finish :)

Marek Sebera Over a year ago

sorry, my fault, haven't tested the code, just repaired snippet :)

MartyIX Over a year ago

A problem that bugs me is that I would like to get PID of $cmd but $pid now contains PID of start command (as expected) and I'm really at loss how to find out the subprocess PID.

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