3v4l.org

run code in 300+ PHP versions simultaneously
<?php $apikey = '2w6a9c39hb7hnxvsvnb9rzgr'; $secret = 'KaEvDVeF86HjAEV4ppZk5Xaa'; $timestamp = gmdate('U', 1200603038); // $sig = md5($apikey . $secret . $timestamp); echo "$sig\n";

preferences:
49.4 ms | 402 KiB | 5 Q