- hex2bin: documentation ( source)
- bin2hex: documentation ( source)
- base64_decode: documentation ( source)
- base64_encode: documentation ( source)
- strrev: documentation ( source)
<?php
print("3d3d516343746d4d6d6c315669563362\n");
print(hex2bin(strrev(base64_decode("3d3d516343746d4d6d6c315669563362"))) + "\n");
print(bin2hex(strrev(base64_encode("03"))) + "\n");