<?php$redis = new Redis();$redis->connect('127.0.0.1', 6379);$redis->auth("php001");//這個key記錄該ip的訪問次數 也可改成用戶id//$key = 'userid_11100';$key=get_real_ip();//限制次數為5$limit = 5;$check = $redis->exists($key);if($check){  $redis->incr($key);  $count = $redis->get($key);  if($count > 5){    exit('請求太頻繁，請稍后再試！');  }}else{  $redis->incr($key);  //限制時間為60秒  $redis->expire($key,60);}$count = $redis->get($key);echo '第 '.$count.' 次請求';//獲取客戶端真實ip地址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;}?>