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- <?php
- /*
- Author: Jim Westergren, Jeedo Aquino & Flynsarmy
- File: index-with-redis.php
- Updated: 2012-10-25
- This is a redis caching system for wordpress.
- see more here: www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/
- Originally written by Jim Westergren but improved by Jeedo Aquino.
- some caching mechanics are different from jim's script which is summarized below:
- - cached pages do not expire not unless explicitly deleted or reset
- - appending a ?c=y to a url deletes the entire cache of the domain, only works when you are logged in
- - appending a ?r=y to a url deletes the cache of that url
- - submitting a comment deletes the cache of that page
- - refreshing (f5) a page deletes the cache of that page
- - includes a debug mode, stats are displayed at the bottom most part after </html>
- for setup and configuration see more here:
- www.jeedo.net/lightning-fast-wordpress-with-nginx-redis/
- use this script at your own risk. i currently use this albeit a slightly modified version
- to display a redis badge whenever a cache is displayed.
- */
- // change vars here
- $debug = 0; // set to 1 if you wish to see execution time and cache actions
- $display_powered_by_redis = 1; // set to 1 if you want to display a powered by redis message with execution time, see below
- $start = microtime(); // start timing page exec
- // if cloudflare is enabled
- if ( isset($_SERVER['HTTP_CF_CONNECTING_IP']) )
- $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
- // from wp
- define('WP_USE_THEMES', true);
- // init predis
- require 'predis/src/Autoloader.php';
- Predis\Autoloader::register();
- $redis = new Predis\Client();
- // init vars
- $cached = 0;
- $domain = $_SERVER['HTTP_HOST'];
- $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
- $url = str_replace('?r=y', '', $url);
- $url = str_replace('?c=y', '', $url);
- $dkey = md5($domain);
- $ukey = md5($url);
- // check if page isn't a comment submission
- $submit = isset($_SERVER['HTTP_CACHE_CONTROL']) && $_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0';
- // check if logged in to wp
- $cookie = var_export($_COOKIE, true);
- $loggedin = preg_match("/wordpress_logged_in/", $cookie);
- // check if a cache of the page exists
- if (!$loggedin && !$submit && !strpos($url, '/feed/') && !strpos($url, '/page/') && !strpos($url, '/category/') && $redis->hexists($dkey, $ukey)) {
- echo $redis->hget($dkey, $ukey);
- $cached = 1;
- $msg = 'this is a cache';
- // if a comment was submitted or clear page cache request was made delete cache of page
- } else if ($submit || substr($_SERVER['REQUEST_URI'], -4) == '?r=y') {
- require('./wp-blog-header.php');
- $redis->hdel($dkey, $ukey);
- $msg = 'cache of page deleted';
- // delete entire cache, works only if logged in
- } else if ($loggedin && substr($_SERVER['REQUEST_URI'], -4) == '?c=y') {
- require('./wp-blog-header.php');
- if ($redis->exists($dkey)) {
- $redis->del($dkey);
- $msg = 'domain cache flushed';
- } else {
- $msg = 'no cache to flush';
- }
- // if logged in don't cache anything
- } else if ($loggedin) {
- require('./wp-blog-header.php');
- $msg = 'not cached';
- // cache the page
- } else {
- // turn on output buffering
- ob_start();
- require('./wp-blog-header.php');
- // get contents of output buffer
- $html = ob_get_contents();
- // clean output buffer
- ob_end_clean();
- echo $html;
- // Store to cache only if the page exist and is not a search result.
- if (!is_404() && !is_search()) {
- // store html contents to redis cache
- $redis->hset($dkey, $ukey, $html);
- $msg = 'cache is set';
- }
- }
- $end = microtime(); // get end execution time
- // show messages if debug is enabled
- if ($debug) {
- echo "REDIS DEBUG ";
- echo $msg.': ';
- echo t_exec($start, $end);
- }
- if ($cached && $display_powered_by_redis) {
- // You should move this CSS to your CSS file and change the: float:right;margin:20px 0;
- echo "<style>#redis_powered{float:right;margin:20px 0;background:url(http://images.staticjw.com/jim/3959/redis.png) 10px no-repeat #fff;border:1px solid #D7D8DF;padding:10px;width:190px;}
- #redis_powered div{width:190px;text-align:right;font:10px/11px arial,sans-serif;color:#000;}</style>";
- echo "<a href='http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/' style='text-decoration:none;'><div id='redis_powered'><div>Page generated in<br/> ".t_exec($start, $end)." sec</div></div></a>";
- }
- // time diff
- function t_exec($start, $end) {
- $t = (getmicrotime($end) - getmicrotime($start));
- return round($t,5);
- }
- // get time
- function getmicrotime($t) {
- list($usec, $sec) = explode(" ",$t);
- return ((float)$usec + (float)$sec);
- }
- ?>
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