1. Go to this page and download the library: Download phpseclib/phpseclib2_compat library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
phpseclib / phpseclib2_compat example snippets
use phpseclib\Crypt\RSA;
$rsa = new RSA;
$rsa->loadKey('ecdsa private key');
$ssh = new SSH2('website.com');
$ssh->login('username', $rsa);