- hash: documentation ( source)
<?php
/*
* Fill in unhashed & hashed seeds below and click blue 'eval();' button below textarea.
*
* ------------------ */
$hashedSeed = 'paste initial hashed server seed here';
$unhashedSeed = 'paste given unhashed server seed here';
$hash = hash('sha256', $unhashedSeed);
echo "Generated hash: $hash\n";
echo 'Does hash match? ' . ($hashedSeed == $hash ? 'Yes' : 'No') . "\n";