3v4l.org

run code in 300+ PHP versions simultaneously
<?php function encode($message, $seed) { return base64_encode($message.$seed); } function decode($data, $seed) { return base64_decode($data); } var_dump($data = encode('hi this is a string','seed123'), decode($data, 'seed123'));

preferences:
37.73 ms | 402 KiB | 5 Q