- gmdate: documentation ( source)
- md5: documentation ( source)
<?php
$apikey = '2fvmer3qbk7f3jnqneg58bu2';
$secret = 'qvxkmw57pec7';
$timestamp = gmdate('U', 1200603038); // 1200603038
$sig = md5($apikey . $secret . $timestamp);
echo $sig;
echo md5($apikey . $secret);
?>