How to create a connection via SSH using the key files: d_ed25519 id_ed25519.pub id_ed25519-cert.pub

[arhiopterecs]

quick question
I have 3 files:
id_ed25519
id_ed25519.pub
id_ed25519-cert.pub
Could you please show me how I can use this project to create a connection via SSH using the key files that I have?
Thanks!

[terrafrost]

Using phpseclib v3:

use phpseclib3\Crypt\PublicKeyLoader;
use phpseclib3\Net\SSH2;

$key = PublicKeyLoader(file_get_contents('/path/to/id_ed25519'));
$ssh = new SSH2('website.com');
$ssh->login('username', $key);

echo $ssh->exec('ls -latr');

If your key is encrypted you'll need to pass a second parameter to load:

$key = PublicKeyLoader(file_get_contents('/path/to/id_ed25519'), 'password');