aes encrypt and decrypt

aes_encrypt_decrypt.php

<?php
 function aes_decrypt($code, $key, $iv) {
     $mode = MCRYPT_MODE_CBC;
     $enc = MCRYPT_RIJNDAEL_128;
     return mcrypt_decrypt($enc, $key, $code, $mode, $iv);
 }
 
 function aes_encrypt($code, $key, $iv) {
     $mode = MCRYPT_MODE_CBC;
     $enc = MCRYPT_RIJNDAEL_128;
     return mcrypt_encrypt($enc, $key, $code, $mode, $iv);
 }
 $encryptable = 'asdfasdfasdf';
 $iv = "000000000000000" . dechex(1);
 $key = '238EF4477A3ADD32385C584EED6A4B8B';

 $encrypted = aes_encrypt($encryptable, $key, $iv);

 //PROVA DELLE FUNZIONI
 $test2 = aes_decrypt($encrypted, $key, $iv);
 echo $test2;