- var_dump: documentation ( source)
- rtrim: documentation ( source)
- base64_decode: documentation ( source)
<?php
$encrypt_result = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, "bite", "data", MCRYPT_MODE_ECB);
var_dump($encrypt_result);
$user_id = 4;
$result = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, "bite", base64_decode($user_id), MCRYPT_MODE_ECB), "\0");
var_dump($result);