PHP exec，仅输出错误

Question

I am using PHP exec to run a Powershell script to create a new user that is being submitted via a HTML form. What I am looking to do is output only errors from this command on the webpage so any IT team member can see if anything went wrong. Here is what I have:

$psPath = 'c:\\Windows\\System32\WindowsPowerShell\v1.0\\powershell.exe -version 5';
$psDIR = "d:\\wamp64\\www\\includes\\";
$psScript = "NewHire.ps1";
$runCMD = $psPath. ' -ExecutionPolicy RemoteSigned '.$psDIR.$psScript

$createuser = exec($runCMD.' 2>&1', $out);

When I do a var_dump($out), it shows both the output and errors. I tried changing it to exec($runCMD.' &1', $out) but it shows output only. If I try exec($runCMD.' 2>', $out), it doesn't run my command. Is there a way I can display errors only in the $out varible?

Answer 1

Found out this works for stderr only:

exec($runCMD.' >&2' , $out);