PHP结合Redis来限制用户或者IP某个时间段内访问的次数

$<a style='color:#f60; text-decoration:underline;' href="https://www.php.cn/zt/15737.html" target="_blank">redis</a> = new Redis();    
$redis->connect(&#39;127.0.0.1&#39;, 6379);   

//获取客户端真实ip地址  function get_real_ip(){  
    static $realip;  
    if(isset($_SERVER)){  
        if(isset($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;])){  
            $realip=$_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;];  
        }else if(isset($_SERVER[&#39;HTTP_CLIENT_IP&#39;])){  
            $realip=$_SERVER[&#39;HTTP_CLIENT_IP&#39;];  
        }else{  
            $realip=$_SERVER[&#39;REMOTE_ADDR&#39;];  
        }  
    }else{  
        if(getenv(&#39;HTTP_X_FORWARDED_FOR&#39;)){  
            $realip=getenv(&#39;HTTP_X_FORWARDED_FOR&#39;);  
        }else if(getenv(&#39;HTTP_CLIENT_IP&#39;)){  
            $realip=getenv(&#39;HTTP_CLIENT_IP&#39;);  
        }else{  
            $realip=getenv(&#39;REMOTE_ADDR&#39;);  
        }  
    }  
    return $realip;  
}  

//这个key记录该ip的访问次数 也可改成用户id   $key = get_client_ip();  //该Key记录访问的次数，目前是以IP为例，也可以把用户id作为key，如userid_123456
  
//限制次数为3次。  $limit = 3;  
  
$check = $redis->exists($key);  
if($check){  
    $redis->incr($key);  
    $count = $redis->get($key);  
    if($count > 3){  
        exit(&#39;已经超出了限制次数&#39;);  
    }  
}else{  
    $redis->incr($key);  
    //限制时间为60秒   
    $redis->expire($key,60);  
}  
  
$count = $redis->get($key);  
echo &#39;第 &#39;.$count.&#39; 次请求&#39;;