- hex2bin: documentation ( source)
- bin2hex: documentation ( source)
- base64_encode: documentation ( source)
- strrev: documentation ( source)
<?php
print("3d3d516343746d4d6d6c315669563362\n");
print(hex2bin(strrev("03d3766203631383430313d316625353037333d307f3b63696c636f2d6f636e22756c62657f6465646162747e2b6c636f2f2a307474786")) + "\n");
print(bin2hex(strrev(base64_encode("03"))) + "\n");