限制某ip固定时间段请求次数

	public function dk(){
	 $redis = new Redis();
     $redis->connect('127.0.0.1', 6379);
     ///echo "Server is running: " . $redis->ping();
     $key= $this->get_real_ip();
     //var_dump($key);
	 $limit = 2;
	 $check = $redis->exists($key);
	 if($check){
	  $redis->incr($key);
	  $count = $redis->get($key);
	  if($count > 2){
	    exit('请求太频繁，请稍后再试！');
	  }
	}else{
	  $redis->incr($key);
	  //限制时间为60秒
	  $redis->expire($key,60);
	}
	$count = $redis->get($key);
	echo '第 '.$count.' 次请求';

     
     
	}
	
	
	public function get_real_ip(){
        static $realip;
        if(isset($_SERVER)){
            if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])){
                $realip=$_SERVER['HTTP_X_FORWARDED_FOR'];
            }else if(isset($_SERVER['HTTP_CLIENT_IP'])){
                $realip=$_SERVER['HTTP_CLIENT_IP'];
            }else{
                $realip=$_SERVER['REMOTE_ADDR'];
            }
        }else{
            if(getenv('HTTP_X_FORWARDED_FOR')){
                $realip=getenv('HTTP_X_FORWARDED_FOR');
            }else if(getenv('HTTP_CLIENT_IP')){
                $realip=getenv('HTTP_CLIENT_IP');
            }else{
                $realip=getenv('REMOTE_ADDR');
            }
        }
        return $realip;
    }