<?php
$data = "helloWorld";
$key = 'CefaiNooH4oi6oje';
$iv = 'Choodub8ahd4choo';
$data = openssl_encrypt($data, 'AES-256-CBC', $key, 0, $iv);
echo $data;
PD9waHAKCiAgICRkYXRhID0gImhlbGxvV29ybGQiOwoKICAgJGtleSAgPSAnQ2VmYWlOb29ING9pNm9qZSc7CiAgICRpdiAgID0gJ0Nob29kdWI4YWhkNGNob28nOwogICAkZGF0YSA9IG9wZW5zc2xfZW5jcnlwdCgkZGF0YSwgJ0FFUy0yNTYtQ0JDJywgJGtleSwgMCwgJGl2KTsKICAgZWNobyAkZGF0YTs=