赞的算法

  //规则  
   if($_COOKIE['ip'] == $ip){    
   
     if(!empty($_COOKIE['zanid'])){
         
         $zanidArr = explode(',', $_COOKIE['zanid']);
         if(in_array($id,$zanidArr)){
              echo "<script>alert('该商品已经赞过，一小时内只允许赞一次!');history.go(-1);</script>"; 
              die;
         }else{
             array_unshift($zanidArr, $id); //入栈
         }
         setcookie('zanid', implode(',', $zanidArr),  time()+3600);      
     }         
   } else {
       setcookie('zanid', $id, time()+3600);
       setcookie("ip",$ip,time()+3600);   
    }