- hex2bin: documentation ( source)
- bin2hex: documentation ( source)
<?php
echo bin2hex('magnet:?xt=urn:btih:49A48ADF414052E4F470A319ED6D200FB4C240B9');
echo "\n";
echo hex2bin('6d61676e65743a3f78743d75726e3a627469683a34394134384144463431343035324534463437304133313945443644323030464234433234304239');