RNCryptor-php/examples/encrypt.php

<?php

require __DIR__ . '/../vendor/autoload.php';

$password = "myPassword";
$plaintext = "Here is my test vector. It's not too long, but more than a block and needs padding.";

$cryptor = new \RNCryptor\RNCryptor\Encryptor;
$base64Encrypted = $cryptor->encrypt($plaintext, $password);

echo "Plaintext:\n$plaintext\n\n";
echo "Base64 Encrypted:\n$base64Encrypted\n\n";