我整理一下redis主要在项目作用,只是我接触到的

1  手机验证码存入redis中,可以限制什么时候有效

2 防止接口请求频率过高,例如一分钟只能请求5次

代码如下:

<?php
/**
* 获取ip
* @return array|false|string
*/
function getIp()
{
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP");
else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
$ip = getenv("REMOTE_ADDR");
else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
$ip = $_SERVER['REMOTE_ADDR'];
else
$ip = "unknown";

return ($ip);  

}

$ip = getIp();

$redis = new Redis();
$redis->connect('127.0.0.1','6379');
$key = "api-".$ip."-limit";
$num = 5;

if ($redis->exists($key)) {
$redis->incr($key);
$result = $redis->get($key);

if ($result > 5) {  
    exit('次数过多');  
}

}else{
$redis->incr($key);
$redis->expire($key,60);
}

print_r('这是获得第 '.$redis->get($key)." 次");

3做缓存用,公司抓取股票基金的数据,存入redis进行缓存使用

4进行队列,应对并发请求

5消息订阅推送

publish(消息发布端):pub.php

connect('127.0.0.1','6379');

//消息发布
$res = $redis->publish('test1',123);
$res = $redis->publish('test2',789);

subscribe(消息订阅端): sub.php

connect('127.0.0.1','6379');
$redis->subscribe(['test1','test2'],'rec');

function rec($instance,$channelName,$message){
var_dump($instance);
echo "--".$channelName."===>".$message.PHP_EOL;
}

用守护进程模式, php  sub.php