<?php
  $ciphertext = base64_decode("zA/eeF+WFVMDsZ7+iA==");
  $iv = substr($ciphertext, 0, 8);
  $text = substr($ciphertext, 8, strlen($ciphertext) - 8);

  $td = mcrypt_module_open("rijndael-256", "", "cbc", $iv);
  mcrypt_generic_init($td, "PasswordPassword", $iv);
  $plaintext = mdecrypt_generic($td, $text);
  echo $plaintext;
  mcrypt_generic_deinit($td);
  mcrypt_module_close($td);
?>