Command.php

<?php
namespace nodes;

use \nodes\Log;

class Command {
	public static function execute($command, $cwd = null, $env = null, $allowSudo = true) {
		$descriptorspec = array(
			0 => array("pipe", "r"), // stdin  is a pipe that the child will read from
			1 => array("pipe", "w"), // stdout is a pipe that the child will write to
			2 => array("pipe", "w")  // stderr is a pipe that the child will write to
		);

		Log::debug("Executing command: $command");
		if (!empty($cwd)) {
			Log::debug("--> cwd = $cwd");
		}

		// Execute command
		$process = proc_open($command, $descriptorspec, $pipes, $cwd, $env);
		if (!is_resource($process)) {
			Log::err("Could not execute command: $command");
			throw new Exception("Could not execute command: $command");
		}

		// close stdin
		fclose($pipes[0]);

		$stdout = trim(stream_get_contents($pipes[1]));
		fclose($pipes[1]);
		Log::debug("--> stdout:");
		Log::debug($stdout);

		$stderr = trim(stream_get_contents($pipes[2]));
		fclose($pipes[2]);

		if (!empty($stderr)) {
			Log::out("--> stderr:");
			Log::out($stderr);
		} else {
			Log::debug('--> stderr:');
			Log::debug($stderr);
		}

		$exit_code = proc_close($process);
		Log::debug("--> exit_code: $exit_code");

		unset($pipes[0], $pipes[1], $pipes[2], $pipes);
		unset($descriptorspec[0], $descriptorspec[1], $descriptorspec[2], $descriptorspec);

		return compact('stdout', 'stderr', 'exit_code', 'command', 'cwd', 'env');
	}
}

demo.php

<?php
$info = Command::execute('/var/www/manager/htdocs/bin/sftp-transfer-file ' . $servers . ' --version "' . $this->Configuration->getVersion() . '" --project "' . $this->Configuration->get('Project.name') . '"');
if ($info['exit_code'] != 0) {
	Log::err($info['stderr']);
	return false;
}