Código:
Gracias por su ayuda. $antiflood_time = time() + 20; $cookie = explode(",", $_COOKIE['antiflood']); if ($cookie[1] >= $cmensaje) { echo "<script>alert(\"$error_antiflood\")</script><body onload=\"javascript:window.history. go( -1 )\">"; exit; } elseif ($cookie[0] == $_SERVER['PHP_SELF']) { $cookie[1]++; setcookie("antiflood", $_SERVER['PHP_SELF'] . "," . $cookie[1], $antiflood_time); } else { setcookie("antiflood", ""); setcookie("antiflood", $_SERVER['PHP_SELF'] . ",1", $antiflood_time); }