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php中用memcached实现页面防刷新功能

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Release: 2016-06-06 20:19:18
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这篇文章主要介绍了php中用memcached实现页面防刷新功能,这是一个比较安全、稳定的防刷新方案,需要的朋友可以参考下

有个新需求要加上去,防止用户频繁刷新页面。具体需求是当用户在一分钟之后内请求指定的页面超过100次,就直接拒绝请求。仔细分析后发现这个功能用memcache来做最方便:

1、以用户IP和被请求的文件名作为KEY值。

2、以memcached的方法increment()来自增记录用户访问次数,increment()是原子性增加,准确。

3、设置set()时指定过期时间为60s,这样就统计一分钟的访问次数。

于是写了个函数放在项目的初始化文件中调用,函数内容如下:

function requestCount(){ $patharr = pathinfo($_SERVER['PHP_SELF']); $filename = explode('?',$patharr['basename']);//获取当前文件名 if( in_array($filename['0'],array('index.php','login.php','password.php')) ){ global $memcache; $clientip = get_client_ip(); //使用长整型IP和文件名生成KEY $ipkey = 'C'.sprintf("%u", ip2long( $clientip )). $filename['0'] ; if( $visitCount = $memcache->get($ipkey) ){ if($visitCount == 100){ die('

Please don\'t refresh your page!

'); }else{ $memcache->increment($ipkey); } }else{ $memcache->set($ipkey,1,0,60); } } } ,
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