本文实例讲述了PHP实现redis限制单ip、单用户的访问次数功能。分享给大家供大家参考，具体如下：
有时候我们需要限制一个api或页面访问的频率，例如单ip或单用户一分钟之内只能访问多少次
类似于这样的需求很容易用Redis来实现
<?php$redis = new Redis();$redis->connect('127.0.0.1', 6379);$redis->auth("php001");//这个key记录该ip的访问次数 也可改成用户id//$key = 'userid_11100';$key=get_real_ip();//限制次数为5$limit = 5;$check = $redis->exists($key);if($check){$redis->incr($key);$count = $redis->get($key);if($count > 5){exit('请求太频繁，请稍后再试！');}}else{$redis->incr($key);//限制时间为60秒$redis->expire($key,60);}$count = $redis->get($key);echo '第 '.$count.' 次请求';//获取客户端真实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;}?>
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