Custom object cache for WordPress with some logic for selectively disabling it for certain URLs.

object-cache.php

<?php
/**
 * Plugin Name: Object Cache
 * Description: Object cache backend - uses APC for local development, Redis or Memcached for prod/staging.
 * Version:     3.0
 * Author:      The Code Company
 * Author URI:  http://thecode.co
 *
 * @package thecodeco
 */

/**
 * Whether the object cache should be enabled.
 *
 * @var boolean
 */
$object_cache_enabled = true;

// Determine if we are on a URL which is has the object cache disabled.
if ( defined( 'OBJECT_CACHE_BLACKLIST_URLS' ) ) {

	// phpcs:disable
	$request_uri  = isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '';
	$request_path = parse_url( $request_uri, \PHP_URL_PATH );
	// phpcs:enable

	foreach ( OBJECT_CACHE_BLACKLIST_URLS as $blacklist_regex ) {

		if ( preg_match( $blacklist_regex, $request_uri ) ) {
			$object_cache_enabled = false;
			break;
		}
	}
}

// Set object cache disabled via constant.
if ( defined( 'OBJECT_CACHE_DISABLE' ) && OBJECT_CACHE_DISABLE ) {
	$object_cache_enabled = false;
}

// Load the appropriate object cache.
if ( $object_cache_enabled ) {

	if ( defined( 'OBJECT_CACHE_USE_MEMCACHE' ) && OBJECT_CACHE_USE_MEMCACHE ) {
		header( 'X-ObjectCache: memcached' );
		require dirname( __FILE__ ) . '/memcached-object-cache.php';
	} else {
		header( 'X-ObjectCache: apc' );
		require dirname( __FILE__ ) . '/apc-object-cache.php';
	}
} else {

	header( 'X-ObjectCache: disabled' );

}