if ( ! class_exists( 'Endurance_Page_Cache' ) ) {
// https://github.com/bluehost/endurance-page-cache
class ET_Core_LIB_BluehostCache extends Endurance_Page_Cache {
private static $_instance;
public function __construct() {
$this->cache_level = get_option( 'endurance_cache_level', 2 );
$this->cache_dir = WP_CONTENT_DIR . '/endurance-page-cache';
$this->cache_exempt = array( 'wp-admin', '.', 'checkout', 'cart', 'wp-json', '%', '=', '@', '&', ':', ';', );
public static function get_instance() {
if ( null === self::$_instance ) {
self::$_instance = new self;
public function clear( $post_id = '' ) {
if ( '' !== $post_id && method_exists( $this, 'purge_single' ) ) {
$this->purge_single( get_the_permalink( $post_id ) );
} else if ( '' === $post_id && method_exists( $this, 'purge_all' ) ) {