Commit 8257b641 authored by Benjamin Adams's avatar Benjamin Adams
Browse files

using ob_start() to cache, instead of making another http request

parent 119d07a2
<?php
$seconds_cache_redis = 60*60*12; // 12 hours by default, you can change in this in wp-admin options page
$ip_of_your_website = '64.90.38.145'; //You must set this to the IP of your website
$secret_string = "changeme"; /*This is if you want to manually refresh the cache
ex: http://example.com/sample-post?refresh=changeme */
$seconds_cache_redis = 60 * 60 * 12; // 12 hours by default, you can change in this in wp-admin options page
$ip_of_your_website = '64.90.38.145'; //You must set this to the IP of your website
$secret_string = "changeme";
/*This is if you want to manually refresh the cache
ex: http://example.com/sample-post?refresh=changeme */
// so we don't confuse the cloudflare server
if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
}
define('WP_USE_THEMES', true);
// Start the timer so we can track the page load time
$start = microtime();
include("wp-content/plugins/wp-redis-cache/predis5.2.php"); //we need this to use Redis inside of PHP
include("wp-content/plugins/wp-redis-cache/predis5.2.php"); //we need this to use Redis inside of PHP
$redis = new Predis_Client();
$current_url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
$current_url = str_replace("?refresh=$secret_string", '', $current_url); //clean up the URL
$current_url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$current_url = str_replace("?refresh=$secret_string", '', $current_url); //clean up the URL
$current_url = str_replace("&refresh=$secret_string", '', $current_url);
$redis_key = md5($current_url);
$redis_key = md5($current_url);
//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 || ($_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
if (isset($_GET['refresh']) || $_GET['refresh'] == $secret_string || ($_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
$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) {
require('./wp-blog-header.php');
$html_of_page = @file_get_contents($current_url);
$usr_seconds=get_option('wp-redis-cache-seconds'); //if the user has the seconds defined in the admin section use it
if(isset($usr_seconds) && is_numeric($usr_seconds))
{
$seconds_cache_redis=$usr_seconds;
}
if(strlen($html_of_page) > 5000)
{
$redis->setex($redis_key, $seconds_cache_redis, $html_of_page);
}
// This is what your server should get if no cache exists
} else {
require('./wp-blog-header.php');
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$isPOST = 1;
} else {
$isPOST = 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;
$usr_seconds = get_option('wp-redis-cache-seconds'); //if the user has the seconds defined in the admin section use it
if (isset($usr_seconds) && is_numeric($usr_seconds)) {
$seconds_cache_redis = $usr_seconds;
}
if (strlen($html_of_page) > 5000) { //prevents caching error pages
$redis->setex($redis_key, $seconds_cache_redis, $html_of_page);
}
} else //either the user is logged in, or is posting a comment, show them uncached
{
require('./wp-blog-header.php');
}
}
// else { // This is what your server should get if no cache exists //depricated, as the ob_start() is cleaner
// require('./wp-blog-header.php');
// }
if ($_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. -->";
// 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. -->";
}
function getMicroTime($t) {
list($usec, $sec) = explode(" ",$t);
return ((float)$usec + (float)$sec);
function getMicroTime($t)
{
list($usec, $sec) = explode(" ", $t);
return ((float) $usec + (float) $sec);
}
......
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