<?php // Start the timer so we can track the page load time $start = microtime(); function getMicroTime($t) { list($usec, $sec) = explode(" ", $t); return ((float) $usec + (float) $sec); } // 12 hours by default, you can change in this in wp-admin options page $seconds_cache_redis = 60 * 60 * 12; //You must set this to the IP of your website $ip_of_your_website = '127.0.0.1'; /*This is if you want to manually refresh the cache ex: http://example.com/sample-post?refresh=changeme */ $secret_string = "changeme"; // so we don't confuse the cloudflare server if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) { $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP']; } define('WP_USE_THEMES', true); $current_url = str_replace(array("?refresh=${secret_string}","&refresh=${secret_string}"), '', "http://${_SERVER['HTTP_HOST']}${_SERVER['REQUEST_URI']}"); //clean up the URL $redis_key = md5($current_url); try { // check if PECL Extension is available if (class_exists('Redis')) { $redis = new Redis(); // Sockets can be used as well. Documentation @ https://github.com/nicolasff/phpredis/#connection $redis->connect('127.0.0.1'); } else // Fallback to predis5.2.php { include_once("wp-content/plugins/wp-redis-cache/predis5.2.php"); //we need this to use Redis inside of PHP $redis = new Predis_Client(); } //Either manual refresh cache by adding ?refresh=secret_string after the URL or somebody posting a comment if (isset($_GET['refresh']) || $_GET['refresh'] == $secret_string || strpos($_SERVER['REQUEST_URI'],"refresh=${secret_string}")!==false || ($_SERVER['HTTP_REFERER'] == $current_url && $_SERVER['REQUEST_URI'] != '/' && $_SERVER['REMOTE_ADDR'] != $ip_of_your_website)) { $redis->del($redis_key); require('./wp-blog-header.php'); // This page is cached, lets display it } else if ($redis->exists($redis_key)) { $html_of_page = $redis->get($redis_key); echo $html_of_page; // If the cache does not exist lets display the user the normal page without cache, and then fetch a new cache page } else if ($_SERVER['REMOTE_ADDR'] != $ip_of_your_website && strstr($current_url, 'preview=true') == false) { $isPOST = ($_SERVER['REQUEST_METHOD'] === 'POST') ? 1 : 0; $loggedIn = preg_match("/wordpress_logged_in/", var_export($_COOKIE, true)); if ($isPost == 0 && $loggedIn == 0) { ob_start(); require('./wp-blog-header.php'); $html_of_page = ob_get_contents(); ob_end_clean(); echo $html_of_page; //if the user has the seconds defined in the admin section use it $usr_seconds = get_option('wp-redis-cache-seconds'); if (isset($usr_seconds) && is_numeric($usr_seconds)) { $seconds_cache_redis = $usr_seconds; } // When a page displays after an "HTTP 404: Not Found" error occurs, do not cache if (!is_404()) { $redis->setex($redis_key, $seconds_cache_redis, $html_of_page); } } else //either the user is logged in, or is posting a comment, show them uncached { require('./wp-blog-header.php'); } } else if ($_SERVER['REMOTE_ADDR'] != $ip_of_your_website && strstr($current_url, 'preview=true') == true) { require('./wp-blog-header.php'); } // else { // This is what your server should get if no cache exists //depricated, as the ob_start() is cleaner // require('./wp-blog-header.php'); // } } catch (Exception $e) { require('./wp-blog-header.php'); } if ($_SERVER['REMOTE_ADDR'] != $ip_of_your_website) { // How long did it take to load the page? (CloudFlare may strip out comments) $end = microtime(); $time = (@getMicroTime($end) - @getMicroTime($start)); echo "<!-- Cache system by Benjamin Adams. Page generated in " . round($time, 5) . " seconds. -->"; }