php用session防CC

<?phpsession_start();$falsenum=isset($_SESSION['f_num'])?intval($_SESSION['f_num']):0;$cc_t=isset($_SESSION['cc_t'])?intval($_SESSION['cc_t']):0;$cc_l=isset($_SESSION['cc_l'])?intval($_SESSION['cc_l']):0;if($falsenum>3){ die('您的IP已被禁止访问');}if((time() - $cc_l)<5){   if ($cc_t>=10){ $_SESSION['f_num']=$falsenum+1;       die('请不要重复刷新');       exit; }else{ $_SESSION['cc_t']=$cc_t+1; }}else{   $_SESSION['cc_l'] = time();   $_SESSION['cc_t'] = 0;}?>

灰常不确定这种方法有木有用，貌似肉鸡多点的话，该怎么死还是怎么死！

求完善，求点评~