Uitati un chalenge foarte interesant: <?php $challenge = function() { $t = (string)$_GET['eval']; $t = str_replace(array('`', '$', '*', '#', ':', '\\', '"', "'", '(', '.'), '', $t); if((strlen($t) > 13) || (false !== strpos($t, 'return'))) { die('Nu e permis!'); } try { eval("\$rst= $t"); } catch (Exception $e) { return false; } return ($rst=== '1337'); }; ?> Have fun!