redis

index-wp-redis.php

@@ -0,0 +1,116 @@
+<?php
+
+$start = microtime();
+
+function getMicroTime($t)
+{
+    list($usec, $sec) = explode(" ", $t);
+    return ((float) $usec + (float) $sec);
+}
+
+
+$debug               =  true;
+$cache				 =  false;
+$ip_of_your_website  =  '127.0.0.1';
+$secret_string       =  'changeme';
+
+
+// so we don't confuse the cloudflare server 
+if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
+    $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
+}
+ 
+
+if(!defined('WP_USE_THEMES')) {
+    define('WP_USE_THEMES', true);
+}
+
+$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)) {
+		$cache  = true;
+        $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;
+			
+			$unlimited			 =  get_option('wp-redis-cache-debug',false);
+			$seconds_cache_redis =  get_option('wp-redis-cache-seconds',43200);
+			if (!is_numeric($seconds_cache_redis)) {
+				$seconds_cache_redis = 43200;
+			}
+			
+			
+			// When a page displays after an "HTTP 404: Not Found" error occurs, do not cache
+			// When the search was used, do not cache
+            if ((!is_404()) and (!is_search()))  {
+                if ($unlimited) {
+                	$redis->set($redis_key, $html_of_page);
+                }
+				else
+				{
+					$redis->setex($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 $e) {
+    require('./wp-blog-header.php');
+}
+
+
+$end  = microtime();
+$time = (@getMicroTime($end) - @getMicroTime($start));
+if ($debug) {
+	echo "<!-- Page generated in " . round($time, 5) . " seconds. -->";
+	echo "<!-- Site was cached  = " . $cache . " -->";
+	echo "<!-- wp-redis-cache-seconds  = " . $seconds_cache_redis . " -->";
+	echo "<!-- wp-redis-cache-secret  = " . $secret_string . "-->";
+	echo "<!-- wp-redis-cache-ip  = " . $ip_of_your_website . "-->";
+	echo "<!-- wp-redis-cache-unlimited = " . $unlimited . "-->";
+	echo "<!-- wp-redis-cache-debug  = " . $debug . "-->";
+}
+

index.php

@@ -1,3 +1,4 @@
 <?php
 define( 'WP_USE_THEMES', true );
 require( './wp/wp-blog-header.php' );
+//require('index-wp-redis.php'); // replace define and require for redis cache, and include index-wp-redis.php