- var_dump: documentation ( source)
- bin2hex: documentation ( source)
<?php
$key = 'abcdefghijklmnop';
$iv = '0123456789abcdef';
$encrypted = openssl_encrypt('a', 'aes-128-cbc', $key, OPENSSL_RAW_DATA, $iv);
$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encrypted, MCRYPT_MODE_CBC, $iv);
var_dump(bin2hex($decrypted));