Redis是一个高级的key-value存储系统，近似memcached，所有内容都存在内存中，因此每秒钟可以逾越10万次GET操作。
我下面提出的解决方案是在Redis中缓存所有输出的HTML 内容而无需再让WordPress重复执行页面脚本。这里使用Redis取代Varnish设置简单，并且可能更快。
安装 Redis
如果你使用的是 Debian 或衍生的操作系统可使用如下命令安装 Redis：
apt-get install redis-server
或阅读 安装指南
使用 Predis 作为 Redis 的 PHP 客户端
你需要一个客户端开辟包以便 PHP 可以毗连到 Redis 办事上。
这里我们推荐 Predis. 上传 predis.php 到 WordPress 的根目录。
前端缓存的PHP脚本
步调1：在WordPress 的根目录成立新文件 index-with-redis.php ，内容如下：
<?php
// Change these two variables:
$seconds_of_caching = 60*60*24*7; // 7 days.
$ip_of_this_website = '204.62.14.112';
/*
- This file is written by Jim Westergren, copyright all rights reserved.- See more here: jimwestergren/wordpress-with-redis-as-a-frontend-cache/- The code is free for everyone to use how they want but please mention my name and link to my article when writing about this.- Change $ip_of_this_website to the IP of your website above.- Add ?refresh=yes to the end of a URL to refresh it's cache- You can also enter the redis client via the command prompt with the command "redis-cli" and then remove all cache with the command "flushdb".
*/
// Very necessary if you use Cloudfare:
if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];}
// This is from WordPress:
define('WP_USE_THEMES', true);
// Start the timer:
function getmicrotime($t) {list($usec, $sec) = explode(" ",$t);return ((float)$usec + (float)$sec);}
$start = microtime();
// Initiate redis and the PHP client for redis:
include("predis.php");$redis = new PredisClient('');
// few variables:
$current_page_url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
$current_page_url = str_replace('?refresh=yes', '', $current_page_url);
$redis_key = md5($current_page_url);
// This first case is either manual refresh cache by adding ?refresh=yes after the URL or somebody posting a comment
if (isset($_GET['refresh']) || substr($_SERVER['REQUEST_URI'], -12) == '?refresh=yes' || ($_SERVER['HTTP_REFERER'] == $current_page_url && $_SERVER['REQUEST_URI'] != '/' && $_SERVER['REMOTE_ADDR'] != $ip_of_this_website)) {require('./wp-blog-header.php');$redis->del($redis_key);
// Second case: cache exist in redis, let's display it
} else if ($redis->exists($redis_key)) {
$html_of_current_page = $redis->get($redis_key);
echo $html_of_current_page;
echo "<!-- This is cache -->";
// third: a normal visitor without cache. And do not cache a preview page from the wp-admin:
} else if ($_SERVER['REMOTE_ADDR'] != $ip_of_this_website && strstr($current_page_url, 'preview=true') == false) {require('./wp-blog-header.php');$html_of_current_page = file_get_contents($current_page_url);$redis->setex($redis_key, $seconds_of_caching, $html_of_current_page);echo "<!-- Cache has been set -->";
// last case: the normal WordPress. Should only be called with file_get_contents:
} else {require('./wp-blog-header.php');}
// Let's display some page generation time (note: CloudFlare may strip out comments):
$end = microtime();$t2 = (getmicrotime($end) - getmicrotime($start));if ($_SERVER['REMOTE_ADDR'] != $ip_of_this_website) {echo "<!-- Cache system by Jim Westergren. Page generated in ".round($t2,5)." seconds. -->";}?>
或直接下载 index-with-redis.php
步调2：将上述代码中的 IP 地址替换成你网站的 IP 地址
步调3：在.htaccess 中将所有呈现 index.php 的处所改成 index-with-redis.php ，如果你使用的是 Nginx 则修改 nginx.conf 中的 index.php 为 index-with-redis.php（并重载 Nginx ： killall -s HUP nginx）。
性能测试
1.没有Redis 的情况下，平均首页执行1.614 秒，文章页0.174 秒（无任何缓存插件）
2.使用Redis 的情况下，平均页面执行时间0.00256秒
我已经在我的博客中使用了如上的体例进行加快很长时间了，一切运行杰出。