HI – thanks or getting back to me.
To answer your query, yes, the object-cache-plst-orig.php backup file is created.
The order the plugins are activated in doesn’t appear to make any difference. The object-cache.php file that Object Cache Pro creates always gets overwritten by the performance plugin, resulting in Object Cache Pro reporting an Invalid drop-in file.
In case it’s of any help…
Contents of Performance plugins object-cache.php :
<?php
/**
* Object cache drop-in from Performance Lab plugin.
*
* This drop-in is used, admittedly as a hack, to be able to measure server
* timings in WordPress as early as possible. Once a plugin is loaded, it is
* too late to capture several critical events.
*
* This file respects any real object cache implementation the site may already
* be using, and it is implemented in a way that there is no risk for breakage.
*
* If you do not want the Performance Lab plugin to place this file and thus be
* limited to server timings only from after plugins are loaded, you can remove
* this file and set the following constant (e.g. in wp-config.php):
*
* define( 'PERFLAB_DISABLE_OBJECT_CACHE_DROPIN', true );
*
* @package performance-lab
* @since 1.8.0
*/
// Set constant to be able to later check for whether this file was loaded.
define( 'PERFLAB_OBJECT_CACHE_DROPIN_VERSION', 1 );
/**
* Loads the Performance Lab Server-Timing API if available.
*
* This function will short-circuit if the constant
* 'PERFLAB_DISABLE_OBJECT_CACHE_DROPIN' is set as true.
*
* @since 1.8.0
*/
function perflab_load_server_timing_api_from_dropin() {
if ( defined( 'PERFLAB_DISABLE_OBJECT_CACHE_DROPIN' ) && PERFLAB_DISABLE_OBJECT_CACHE_DROPIN ) {
return;
}
$plugins_dir = defined( 'WP_PLUGIN_DIR' ) ? WP_PLUGIN_DIR : WP_CONTENT_DIR . '/plugins';
$plugin_dir = $plugins_dir . '/performance-lab/';
if ( ! file_exists( $plugin_dir . 'server-timing/load.php' ) ) {
$plugin_dir = $plugins_dir . '/performance/';
if ( ! file_exists( $plugin_dir . 'server-timing/load.php' ) ) {
return;
}
}
require_once $plugin_dir . 'server-timing/class-perflab-server-timing-metric.php';
require_once $plugin_dir . 'server-timing/class-perflab-server-timing.php';
require_once $plugin_dir . 'server-timing/load.php';
require_once $plugin_dir . 'server-timing/defaults.php';
}
perflab_load_server_timing_api_from_dropin();
// Load the original object cache drop-in if present.
if ( file_exists( WP_CONTENT_DIR . '/object-cache-plst-orig.php' ) ) {
require_once WP_CONTENT_DIR . '/object-cache-plst-orig.php';
}
Contents of object-cache-plst-orig.php (backup of object cache pro’s file):
<?php
/*
* Plugin Name: Object Cache Pro (Drop-in)
* Plugin URI: https://objectcache.pro
* Description: A business class Redis object cache backend for WordPress.
* Version: 1.17.0
* Author: Rhubarb Group
* Author URI: https://rhubarb.group
* License: Proprietary
* Requires PHP: 7.2
*/
defined('ABSPATH') || exit;
if (version_compare(PHP_VERSION, '7.2', '<')) {
return require_once ABSPATH . WPINC . '/cache.php';
}
if (defined('WP_REDIS_DISABLED') && WP_REDIS_DISABLED) {
return;
}
if (! empty(getenv('WP_REDIS_DISABLED'))) {
return;
}
foreach ([
defined('WP_REDIS_DIR') ? WP_REDIS_DIR : null,
// Redis Cache Pro
defined('WPMU_PLUGIN_DIR') ? WPMU_PLUGIN_DIR . '/redis-cache-pro' : null,
defined('WP_CONTENT_DIR') ? WP_CONTENT_DIR . '/mu-plugins/redis-cache-pro' : null,
defined('WP_PLUGIN_DIR') ? WP_PLUGIN_DIR . '/redis-cache-pro' : null,
defined('WP_CONTENT_DIR') ? WP_CONTENT_DIR . '/plugins/redis-cache-pro' : null,
// Object Cache Pro
defined('WPMU_PLUGIN_DIR') ? WPMU_PLUGIN_DIR . '/object-cache-pro' : null,
defined('WP_CONTENT_DIR') ? WP_CONTENT_DIR . '/mu-plugins/object-cache-pro' : null,
defined('WP_PLUGIN_DIR') ? WP_PLUGIN_DIR . '/object-cache-pro' : null,
defined('WP_CONTENT_DIR') ? WP_CONTENT_DIR . '/plugins/object-cache-pro' : null,
] as $path) {
if ($path === null || ! is_readable("{$path}/api.php")) {
continue;
}
if (include_once "{$path}/api.php") {
return;
}
}
error_log('objectcache.critical: Failed to locate and load object cache API');
$GLOBALS['wp_object_cache_errors'] = ['Failed to locate and load object cache API'];
if (defined('WP_DEBUG') && WP_DEBUG) {
throw new RuntimeException('Failed to locate and load object cache API');
}
For what it’s worth, I’ve been using define( 'PERFLAB_DISABLE_OBJECT_CACHE_DROPIN', true );?in wp-config.php for ac couple of days now. object-cache.php not overwritten and object-cache-plst-orig.php not created. I realise I’ll likely be missing some server timing reporting in WooCommerce status due to this.
Off to checkout the the links you’ve shared…
Many thanks
