wiki.techinc.nl/includes/libs/objectcache/IExpiringStore.php

<?php
/**
 * 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.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Cache
 * @author 2015 Timo Tijhof
 */

/**
 * Generic base class for storage interfaces.
 *
 * Provides convenient TTL constants.
 *
 * @ingroup Cache
 * @since 1.27
 */
interface IExpiringStore {

	// Constants for TTL values, in seconds
	const TTL_MINUTE = 60;
	const TTL_HOUR = 3600;
	const TTL_DAY = 86400; // 24 * 3600
	const TTL_WEEK = 604800; // 7 * 24 * 3600
	const TTL_MONTH = 2592000; // 30 * 24 * 3600
	const TTL_YEAR = 31536000; // 365 * 24 * 3600

	const TTL_INDEFINITE = 0;
}