// encrypt
function encrypt(string $data, string $key, string $method) {
  $encrypted = openssl_encrypt($data, $method, $key, OPENSSL_RAW_DATA);
  $encrypted = base64_encode($encrypted);
  return $encrypted;
}

// decrypt
function decrypt(string $data, string $key, string $method) {
  $data = base64_decode($data);
  $data = openssl_decrypt($data, $method, $key, OPENSSL_RAW_DATA);
  return $data;
}