How to run a background process by PHP in windows?

Question

I try to run a Python script as a background process from PHP on Windows using exec() on this way:

<?PHP
    $python    = 'C:\\Users\\User\\anaconda3\\python.exe';
    $py_script = 'C:\\wamp\\www\\lab\\ex\\simple_test.py';
    $py_stdout    = '> temp\\'.session_id()."_std.txt";
    $py_stderror  = '2> temp\\'.session_id()."_stde.txt";

    exec("$py_bg $python $py_script $py_stdout $py_stderror &");

The script called and worked correctly, but PHP still waiting for the script. I removed the end & as I foundout it's only work on Linux and after searching other Q&A find this sulotion:

    exec("start /B $py_bg $python $py_script $py_stdout $py_stderror");

But same result. How can I solve this problem?

=== UPDATE:

I used start /B in the wrong way, I changed my code to this:

<?PHP
    $python    = 'C:\\Users\\User\\anaconda3\\python.exe';
    $py_script = 'C:\\wamp\\www\\lab\\ex\\simple_test.py';
    $py_stdout    = '> temp\\'.session_id()."_std.txt";
    $py_stderror  = '2> temp\\'.session_id()."_stde.txt";
    $py_cmd = "$python $py_script $py_arg_1 $py_std $py_stde";

    pclose(popen("start /B ". $py_cmd, "a"));

But now a Warning in PHP for popen():

Warning: popen(start /B ...,a): No error in C:\wamp\www\lab\start.php on line 50

and an other for pclose():

Warning: pclose() expects parameter 1 to be resource, bool given in ...

Not sure if https://stackoverflow.com/a/45721544/1213708 works. — Nigel Ren, Feb 25 '21 at 08:39
thanks, I changed my way for use `start /B`, but the problem not solved yet. — Milad Abooali, Feb 25 '21 at 09:00
https://stackoverflow.com/questions/7042591/windows-php-pclose-and-popen-issue — GabrieleMartini, Feb 25 '21 at 09:05
Error handling for `popen()` is useful, but not solve the main problem here. I'm working around this function and my code... — Milad Abooali, Feb 25 '21 at 09:11

score 1 · Accepted Answer · answered Feb 25 '21 at 09:22

I checked PHP: popen - Manual and see there a is not a valid mode, but I see this on several answers around here!

however:

The mode. Either 'r' for reading, or 'w' for writing.

By changing mode to r, the script call and run in the background correctly and there is not an error or warning on PHP or Py.

<?PHP
    $python    = 'C:\\Users\\User\\anaconda3\\python.exe';
    $py_script = 'C:\\wamp\\www\\lab\\ex\\simple_test.py';
    $py_stdout    = '> temp\\'.session_id()."_std.txt";
    $py_stderror  = '2> temp\\'.session_id()."_stde.txt";
    $py_cmd = "$python $py_script $py_arg_1 $py_std $py_stde";

    pclose(popen("start /B ". $py_cmd, "r"));

How to run a background process by PHP in windows?

1 Answers1