How to set timeout for ssh2_exec?

Question

PHP

The application works with a remote server via SSH.
Sometimes it happens that the response from the server is very long (more than a minute), and, accordingly, the application hangs until it receives a response.
I need to somehow organize the response timeout so that if there is no response for more than 5 seconds, return, say, an empty response.
Tried using
set_time_limit(5);
ini_set("default_socket_timeout", 5);
stream_set_timeout($ssh, 5);
Does not help...

function sshExec($command)
{
    $ssh = ssh2_connect('host', 22);

    ssh2_auth_password($ssh, 'user', 'password');

    $rStream = ssh2_exec($ssh, $command);
    $rErrorStream = ssh2_fetch_stream($rStream, SSH2_STREAM_STDERR);
    stream_set_blocking($rErrorStream, true);
    stream_set_blocking($rStream, true);

    $response = stream_get_contents($rStream);
    $error = stream_get_contents($rErrorStream);

    fclose($rErrorStream);
    fclose($rStream);

    return [
        'response' => $response,
        'error' => $error
    ];
}

Answer 1

First, you need to understand at what stage you need a timeout.
ssh2_connect does not support setting a timeout and nothing can be done about it. The way out is to use something else, like phpseclib .
For ssh2_exec you can monitor the timeout yourself. More or less like this:

$timeout = 30;
$timeStart = time();
while(!feof($rStream)) {
  echo fread($rStream, 1024);  //stdout
  echo fread($rErrorStream, 1024);  //stderr
  if((time() - $timeStart) > $timeout) {
    //timeout
    break;
  }
  usleep(100);  //prevent cpu overload
}

Well, calls to stream_set_blocking need to be removed.