PowerShell上的输出流用于SSH调用

My PHP script (in Linux) is not printing my values on screen, however it prints a Warning message.

e.g.

This is my php code:

$stream = ssh2_exec($connection, 'powershell "c:emoteScript.ps1" -$NotificationID "5359f76f888ddf35b889dedf"');
$string = stream_get_contents($stream);
echo "Powershell output: ". $string;

This is my powershell code:

Write-Warning "This is a test"

And this is what PHP is writing:

Powershell output: WARNING: You should update your PowerShell to PowerShell 2.0 version.

QUESTION: How can I catch the the stream returned by Powershell?

SOLUTION: we need to tell ssh2_exec whether to wait/block until the remote process finishes search for "block" on this page to see an example.

$stream = ssh2_exec($connection, 'powershell \'C:\scriptsemoteVeeamClientSummary.ps1\' -Client \''. $Client. '\' -NotificationID \''. $NotificationID. '\'');

stream_set_blocking($stream, true);

return stream_get_contents($stream);

and powershell:

Write-Output $result