PHP & PYTHON python code doesn't run if i run in background

Question

I call a python script from PHP but i run script in background because i don't want to wait after script to finish, so i use > /dev/null 2>/dev/null & with shell_exec.
This is the code where i call:

shell_exec("C:\\Python27\\python C:\\xampp\\htdocs\\testing.py > /dev/null 2>/dev/null &");

in python script i have a simple write file:

fileName = "temp.txt"
target = open(fileName, 'w')

for x in range(1, 59):
    target.write("test" + str(x) + "&#13;&#10;")

target.close()

When i call script from PHP with shell_exec("C:\\Python27\\python C:\\xampp\\htdocs\\testing.py");
it's working but webpage it's waiting after script to finish and i don't want that, so i called with > /dev/null 2>/dev/null & but now, the code doesn't run.
Any ideas why code doesn't working when i want to run in background?
Thanks!

LE:

Changed /dev/null/ with nul and still no working.
Now i call shell_exec("C:\\Python27\\python C:\\xampp\\htdocs\\testing.py > NUL 2> NUL &"); and it's working but page still wating after script to finish.

It is NUL, not nul. /dev/null is a Linux bit bucket, and C:\\... is a Windows path... you cannot mix and match Linux and Windows paths like this. — Sverri M. Olsen
– Sverri M. Olsen, Commented Aug 20, 2015 at 11:55
I tried with both options, still no work... It's working but it's waiting after script to finish. — VladutZzZ
– VladutZzZ, Commented Aug 20, 2015 at 11:56
Well, the entire > NUL 2> NUL & is a Linux command (with the Win bit bucket). As I said, you cannot mix and match Linux and Windows stuff like this. Outputting stuff to NUL would just be ... > NUL. According to this, background processes are run using START /B [PATH_TO_EXEC]. Do some research before asking more questions. — Sverri M. Olsen
– Sverri M. Olsen, Commented Aug 20, 2015 at 13:08

VladutZzZ · Accepted Answer · 2015-08-20 13:44:23Z

1

The answer is:
pclose(popen("start /B ". $cmd, "r"));
You can start a program without cmd and PHP will not wait after program to finish.

answered Aug 20, 2015 at 13:44

VladutZzZ

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