$ip = '123.12.123.123';
$user = 'root';
$pass = 'pass';

$conn = ssh2_connect($ip);
ssh2_auth_password($conn, $user, $pass);

$stream = ssh2_exec($conn, 'whoami');
stream_set_blocking($stream, true);

echo stream_get_contents($stream); // root

// INSTALL EXTENSION -
// > sudo apt-get install libssh2-php
// > sudo /etc/init.d/apache2 restart