- define: documentation ( source)
<?php
define('__FLAG__','3xZG{dgznclXAwFVCUHPMWFViZ½SsltxKdrvûVYHSr1}');
if(__FLAG__ === stypr_crypt(stypr_crypt(stypr_crypt($_GET['flag']))))
echo 'Correct!';
else
echo 'Incorrect..';
?>