回答

3、还有一种办法，就是每次请求在redis的set集合中插入一个随机值，score为当时的时间，然后排序获取这段时间内的请求数量，代码如下

<?php
function checkrequest($_actkey) {
    $_timeseconds = 5;//5秒内
    $_timescount = 5; //智能访问5次
    $zSetKey = "test12123".$_actkey;
    $redis = new Redis();
    $redis->connect('127.0.0.1', 6379);
    $nowtime = time();

    $startTime = $nowtime- $_timeseconds;
    $requestHistory = $redis->zRangeByScore($zSetKey, $startTime, $nowtime);
    if (count($requestHistory) >= $_timescount) {
        return false;
    } else {
        $value = $nowtime . rand(0, 999);
        $redis ->multi();
        $redis->zAdd($zSetKey, [], $nowtime, $value);
        $redis->zRemRangeByScore($zSetKey, 0, $startTime);
        $redis->exec();
        return true;
    }

}
echo time();
var_dump(checkrequest("test"));
var_dump(checkrequest("test"));
var_dump(checkrequest("test"));
var_dump(checkrequest("test"));
echo time();

var_dump(checkrequest("test"));
echo time();
var_dump(checkrequest("test"));
echo time();
var_dump(checkrequest("test"));