通过redis限制请求的频率

场景1: 限制用户每分钟获取验证码频率，如一分钟不能超过3次

<?php
/**
 * 场景4：限速
 *
 * @package    scene04.php
 * @author     ethan<toethanxu@outlook.com>
 * @version    2020/6/14
 */

require_once '../../CacheRedis.php';

$server = '127.0.0.1:6379';
$redis = CacheRedis::getInstance($server);

// 限速

$keyPrefix = 'phone:limit:';
$phone = 15111111111;
$key = $keyPrefix . $phone;

// 限制用户每分钟获取验证码频率，如一分钟不能超过3次
$expire = 10;

// expire重复设置，会覆盖上一次过期时间
/*$total = $redis->incr($key);
$redis->expire($key, $expire);
var_dump($total);*/

// 不让key覆盖
/*$res = $redis->get($key);
if ($res) {
    $total = $redis->incr($key);
} else {
    $res = $redis->setex($key, $expire, 1);
    $total = 1;
}
if ($total <= 3) {
    var_dump('send success');
} else {
    var_dump('send limit');
}*/

// 进阶
// setnx: 若key已存在，重复设置会失败
/*$res = $redis->setnx($key, 1);
if ($res) {
    $redis->expire($key, $expire);
    $total = 1;
} else {
    $total = $redis->incr($key);
}
if ($total <= 3) {
    var_dump('send success');
} else {
    var_dump('send limit');
}*/

// 进阶2
$res = $redis->set($key, 1, ['ex' => $expire, 'nx']);
if ($res) {
    $total = 1;
} else {
    $total = $redis->incr($key);
}
var_dump($total);
if ($total <= 3) {
    var_dump('send success');
} else {
    var_dump('send limit');
}

场景2: 限制一个ip地址不能1秒内访问超过n次(方法同场景1)

场景3:限制一个人1分钟内点赞/投票次数不能超过n(方法同场景1)

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