cache-enabler.php

<?php
/*
Plugin Name: Cache Enabler
Text Domain: cache-enabler
Description: Simple and fast WordPress disk caching plugin.
Author: KeyCDN
Author URI: https://www.keycdn.com
License: GPLv2 or later
Version: 1.4.9
*/

/*
Copyright (C)  2020 KeyCDN
Copyright (C)  2015 Sergej Müller
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/


// exit
defined( 'ABSPATH' ) || exit;


// constants
define( 'CE_FILE', __FILE__ );
define( 'CE_DIR', dirname( __FILE__ ) );
define( 'CE_BASE', plugin_basename( __FILE__ ) );
define( 'CE_CACHE_DIR', WP_CONTENT_DIR . '/cache/cache-enabler' );
define( 'CE_MIN_WP', '5.1' );

// hooks
add_action(
    'plugins_loaded',
    array(
        'Cache_Enabler',
        'instance',
    )
);
register_activation_hook(
    __FILE__,
    array(
        'Cache_Enabler',
        'on_activation',
    )
);
register_deactivation_hook(
    __FILE__,
    array(
        'Cache_Enabler',
        'on_deactivation',
    )
);
register_uninstall_hook(
    __FILE__,
    array(
        'Cache_Enabler',
        'on_uninstall',
    )
);


// autoload register
spl_autoload_register( 'cache_autoload' );

// autoload function
function cache_autoload( $class ) {
    if ( in_array( $class, array( 'Cache_Enabler', 'Cache_Enabler_Disk' ) ) ) {
        require_once(
            sprintf(
                '%s/inc/%s.class.php',
                CE_DIR,
                strtolower( $class )
            )
        );
    }
}

// load the WP-CLI command
if ( defined( 'WP_CLI' ) && WP_CLI && class_exists( 'WP_CLI' ) ) {
    require_once CE_DIR . '/inc/cache_enabler_cli.class.php';
}