Vďaka, už som to asi vyriešil.

Poriešil som to cez MySQL databázu.

<?php
	$connection = mysqli_connect("...", "sakulmore", "moje.heslo", "...", 3314);

	$sql = "SELECT email, username, password, first_name, last_name FROM users_registrations";
	$result = mysqli_query($connection, $sql);

	if (mysqli_num_rows($result) > 0) {
		$riadok = mysqli_fetch_assoc($result);

		$username = $riadok['username'];
		$email = $riadok['email'];
		$pass = $riadok['password'];
		$lastname = $riadok['last_name'];
		$firstname = $riadok['first_name'];

		$pripojssh2 = ssh2_connect('localhost');
		ssh2_auth_password($pripojssh2, 'root', 'moje_heslo');

		ssh2_exec($pripojssh2, "./create_user.sh $email $username $firstname $lastname $pass");

		$delete = "DELETE FROM users_registrations WHERE 1";

		mysqli_query($connection, $delete);
	} else {
		echo "Žiadny Klienti...";
	}

	mysqli_close($connection);
?>