index-wp-redis.php

<?php

// Start the timer so we can track the page load time
$start = microtime();

function getMicroTime($time) {
    list($usec, $sec) = explode(" ", $time);
    return ((float) $usec + (float) $sec);
}

function refreshHasSecret($secret) {
    return isset($_GET['refresh']) && $_GET['refresh'] == $secret;
}

function requestHasSecret($secret) {
    return strpos($_SERVER['REQUEST_URI'],"refresh=${secret}")!==false;
}

function isRemotePageLoad($currentUrl, $websiteIp) {
    return (isset($_SERVER['HTTP_REFERER'])
            && $_SERVER['HTTP_REFERER']== $currentUrl
            && $_SERVER['REQUEST_URI'] != '/' 
            && $_SERVER['REMOTE_ADDR'] != $websiteIp);
}

function handleCDNRemoteAddressing() {
    // so we don't confuse the cloudflare server 
    if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
        $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
    }
}

function getCleanUrl($secret) {
    $replaceKeys = array("?refresh=${secret}","&refresh=${secret}");
    $url = "http://${_SERVER['HTTP_HOST']}${_SERVER['REQUEST_URI']}";
    $current_url = str_replace($replaceKeys, '', $url);
    return $current_url;
}

$debug          = true;
$cache          = true;
$websiteIp      = '127.0.0.1';
$reddis_server  = '127.0.0.1';
$secret_string  = 'changeme';
$current_url    = getCleanUrl($secret_string);
$redis_key      = md5($current_url);

handleCDNRemoteAddressing();

if(!defined('WP_USE_THEMES')) {
    define('WP_USE_THEMES', true);
}

try {
    // check if PECL Extension is available
    if (class_exists('Redis')) {
        if ($debug) {
            echo "<!-- Redis PECL module found -->\n";
        }
        $redis = new Redis();

        // Sockets can be used as well. Documentation @ https://github.com/nicolasff/phpredis/#connection
        $redis->connect($reddis_server);
        
    } else { // Fallback to predis5.2.php

        if ($debug) {
            echo "<!-- using predis as a backup -->\n";
        }
        include_once("wp-content/plugins/wp-redis-cache/predis5.2.php"); //we need this to use Redis inside of PHP