Online PHP editor | refs for JVFlC

<?php /* * Fill in all four below and click blue 'eval();' button below textarea. * * ------------------ */ $ticketPrice = -1; $unhashedServerSeed = ''; $nonce = -1; $clientSeed = ''; /* ------------------ */ if ($ticketPrice < 0 || $unhashedServerSeed == '' || $nonce < 0 || $clientSeed == '') { echo "Fill in details"; return; } function stringToInt32($seed) { $groups = str_split((string)$seed, 4); $groups = array_map(function ($g) { return unpack('C*', $g); }, $groups); $groups = array_filter($groups, function ($g) { return count($g) === 4; }); $result = array_map(function ($group) { return array_reduce($group, function ($acc, $cur) { return ($acc << 4) | $cur; }, 0); }, $groups); return array_reduce($result, function ($acc, $cur) { return ($acc ^ $cur); }, 0); } $serverSeedInt = stringToInt32($unhashedServerSeed); $clientSeedInt = stringToInt32($clientSeed); $seed = $serverSeedInt ^ $clientSeedInt ^ (int)$ticketPrice ^ (int)$nonce; $max = 10000; mt_srand($seed, MT_RAND_MT19937); $result = mt_rand(0, $max); echo "Seed: $seed\n"; echo "Result: $result";