3v4l.org

run code in 300+ PHP versions simultaneously
<?php $secret = "3d3d516343746d4d6d6c315669563362"; print(hex2bin($secret)); print(strrev(hex2bin($secret))) //print(hex2bin(strrev(base64_decode($secret)))); ?>

preferences:
52.4 ms | 402 KiB | 5 Q