JimWestergren · February 18, 2025 07:30 · May 30, 2013 · Apr 4, 2013 · Feb 15, 2013 · Dec 12, 2012
diff --git a/index-with-redis.php b/index-with-redis.php
@@ -58,7 +58,7 @@
 $ukey = md5($url);
 
 // check if page isn't a comment submission
-(isset($_SERVER['HTTP_CACHE_CONTROL']) && $_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0') ? $submit = 1 : $submit = 0);
+(isset($_SERVER['HTTP_CACHE_CONTROL']) && $_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0') ? $submit = 1 : $submit = 0;
 
 // check if logged in to wp
 $cookie = var_export($_COOKIE, true);

diff --git a/index-with-redis.php b/index-with-redis.php
@@ -58,7 +58,7 @@
 $ukey = md5($url);
 
 // check if page isn't a comment submission
-(($_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0') ? $submit = 1 : $submit = 0);
+(isset($_SERVER['HTTP_CACHE_CONTROL']) && $_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0') ? $submit = 1 : $submit = 0);
 
 // check if logged in to wp
 $cookie = var_export($_COOKIE, true);

diff --git a/index-with-redis.php b/index-with-redis.php
@@ -110,8 +110,8 @@
     ob_end_clean();
     echo $html;
 
-    // Store to cache only if the page exist. Otherwise status code 200 is sent when 404 should be sent.
-    if (!is_404()) {
+    // 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';

diff --git a/README b/README
@@ -1 +0,0 @@
-See more info here: [www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/] (http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/)

diff --git a/README b/README
@@ -1 +1 @@
-See more info here: http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/
+See more info here: [www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/] (http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/)
diff --git a/README b/README
@@ -0,0 +1 @@
+See more info here: http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/
diff --git a/index-with-redis.php b/index-with-redis.php
@@ -110,9 +110,12 @@
     ob_end_clean();
     echo $html;
 
-    // store html contents to redis cache
-    $redis->hset($dkey, $ukey, $html);
-    $msg = 'cache is set';
+    // Store to cache only if the page exist. Otherwise status code 200 is sent when 404 should be sent.
+    if (!is_404()) {
+        // store html contents to redis cache
+        $redis->hset($dkey, $ukey, $html);
+        $msg = 'cache is set';
+    }
 }
 
 $end = microtime(); // get end execution time

diff --git a/index-with-redis.php b/index-with-redis.php
@@ -65,7 +65,7 @@
 $loggedin = preg_match("/wordpress_logged_in/", $cookie);
 
 // check if a cache of the page exists
-if ($redis->hexists($dkey, $ukey) && !$loggedin && !$submit) {
+if ($redis->hexists($dkey, $ukey) && !$loggedin && !$submit && !strpos($url, '/feed/')) {
 
     echo $redis->hget($dkey, $ukey);
     $cached = 1;

diff --git a/index-with-redis.php b/index-with-redis.php
@@ -1,69 +1,145 @@
 <?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: www.jimwestergren.com/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 $ip_of_this_website to the IP of your website above.
-- Add ?refresh=yes to the end of a URL to refresh it's cache
-- You can also enter the redis client via the command prompt with the command "redis-cli" and then remove all cache with the command "flushdb".
+    Author: Jim Westergren & Jeedo Aquino
+    File: index-with-redis.php
+    Updated: 2012-10-25
+
+    This is a redis caching system for wordpress.
+    see more here: www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/
+
+    Originally written by Jim Westergren but improved by Jeedo Aquino.
+
+    some caching mechanics are different from jim's script which is summarized below:
+
+    - cached pages do not expire not unless explicitly deleted or reset
+    - appending a ?c=y to a url deletes the entire cache of the domain, only works when you are logged in
+    - appending a ?r=y to a url deletes the cache of that url
+    - submitting a comment deletes the cache of that page
+    - refreshing (f5) a page deletes the cache of that page
+    - includes a debug mode, stats are displayed at the bottom most part after </html>
+
+    for setup and configuration see more here:
+
+    www.jeedo.net/lightning-fast-wordpress-with-nginx-redis/
+
+    use this script at your own risk. i currently use this albeit a slightly modified version
+    to display a redis badge whenever a cache is displayed.
+
 */
-
-// Very necessary if you use Cloudfare:
-if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
-	$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
+
+// change vars here
+$cf = 1;			// set to 1 if you are using cloudflare
+$debug = 0;			// set to 1 if you wish to see execution time and cache actions
+$display_powered_by_redis = 1;  // set to 1 if you want to display a powered by redis message with execution time, see below
+
+$start = microtime();   // start timing page exec
+
+// if cloudflare is enabled
+if ($cf) {
+    if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
+        $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
+    }
 }
- 
-// This is from WordPress:
+
+// from wp
 define('WP_USE_THEMES', true);
-
-// Start the timer:
-function getmicrotime($t) {
-	list($usec, $sec) = explode(" ",$t);
-	return ((float)$usec + (float)$sec);
-}
-$start = microtime();
-
-// Initiate redis and the PHP client for redis:
+
+// init predis
 include("predis.php");
 $redis = new Predis\Client('');
-
-// few variables:
-$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, $html_of_current_page);
-	echo "<!-- Cache has been set -->";
-
-// last case: the normal WordPress. Should only be called with file_get_contents:
+
+// init vars
+$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($url);
+
+// check if page isn't a comment submission
+(($_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0') ? $submit = 1 : $submit = 0);
+
+// check if logged in to wp
+$cookie = var_export($_COOKIE, true);
+$loggedin = preg_match("/wordpress_logged_in/", $cookie);
+
+// check if a cache of the page exists
+if ($redis->hexists($dkey, $ukey) && !$loggedin && !$submit) {
+
+    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 {
-	require('./wp-blog-header.php');
+
+    // 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 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 $msg.': ';
+    echo t_exec($start, $end);
 }
-
-
-// Let's display some page generation time (note: CloudFlare may strip out comments):
-$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. -->";
+
+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);
 }
+
 ?>
diff --git a/Redis as a Frontend Cache for WordPress.php → index-with-redis.php b/Redis as a Frontend Cache for WordPress.php → index-with-redis.php
diff --git a/Redis as a Frontend Cache for WordPress → Redis as a Frontend Cache for WordPress.php b/Redis as a Frontend Cache for WordPress → Redis as a Frontend Cache for WordPress.php
diff --git a/Redis as a Frontend Cache for WordPress b/Redis as a Frontend Cache for WordPress
@@ -0,0 +1,69 @@
+<?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: www.jimwestergren.com/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 Predis\Client('');
+
+// 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. -->";
+}
+?>
Original file line number	Diff line number	Diff line change
		@@ -1 +0,0 @@
		See more info here: [www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/] (http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/)
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		See more info here: http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/
		See more info here: [www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/] (http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/)
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		See more info here: http://www.jimwestergren.com/wordpress-with-redis-as-a-frontend-cache/