execute.php

function execute(string $cmd, ?string $stdin = null): array
{
  $proc = proc_open($cmd, [0 => ['pipe', 'r'], 1 => ['pipe', 'w'], 2 => ['pipe', 'w']], $pipes);
  if ($stdin !== null) {
    fwrite($pipes[0], $stdin);
  }
  fclose($pipes[0]);
  $stdout = stream_get_contents($pipes[1]);
  fclose($pipes[1]);
  $stderr = stream_get_contents($pipes[2]);
  fclose($pipes[2]);
  $exit = proc_close($proc);
  return [$stdout, $stderr, $exit];
}