<?php

/**
 * SSH login and halt hosts
 * For Ubuntu Server (or sudo environment)
 */
$user = 'username';
$password = 'password';
$hosts = [
    '192.168.1.10',
    '192.168.1.11',
    '192.168.1.12',
];
$command = 'sudo halt -p';
$timeout = 15; // seconds

foreach ($hosts as $host) {
    $connection = ssh2_connect($host, 22);
    if ($connection === false) {
        echo $host . ' connection fail' . PHP_EOL;
        continue;
    }
    if (ssh2_auth_password($connection, $user, $password) === false) {
        echo $host . ' auth fail' . PHP_EOL;
        continue;
    }
    $shell = ssh2_shell($connection, 'xterm', null, 80, 25, SSH2_TERM_UNIT_CHARS);
    ssh_read($shell, '#' . $user . '\@[^:]+\:\~\$#');
    fwrite($shell, $command . "\n");
    ssh_read($shell, '#\[sudo\][^:]+:#');
    fwrite($shell, $password . "\n");
    stream_set_blocking($shell, true);
    fread($shell, 1024 * 32);
    echo $host . ' halted' . PHP_EOL;
}

function ssh_read($shell, $waitFor) {
    global $timeout;
    for ($i = 0; $i < $timeout * 10; ++$i) {
        usleep(100 * 1000);
        $out = fread($shell, 1024 * 32);
        if ($out === false) {
            break;
        }
        echo $out;
        if (preg_match($waitFor, $out)) {
            break;
        }
    }
}