gistfile1

	/**
	 * Garbage collection routine for cleaning up old and expired
	 * sessions.
	 * 
	 * 1.3 Added support for shopping session cold storage
	 *
	 * @author Jonathan Davis
	 * @since 1.1
	 * @version 1.3
	 *
	 * @return boolean
	 **/
	function purge () {
		if (empty($this->session)) return false;

		$timeout = SHOPP_SESSION_TIMEOUT;
		$now = current_time('mysql');

		$meta_table = DatabaseObject::tablename('meta');
		DB::query("INSERT INTO $meta_table (parent,context,type,name,value,created,modified)
					SELECT session,'shopping','session','coldstorage',data,created,modified FROM $this->_table WHERE $timeout < UNIX_TIMESTAMP('$now') - UNIX_TIMESTAMP(modified) AND shopping=1");

		if (!DB::query("DELETE LOW_PRIORITY FROM $this->_table WHERE $timeout < UNIX_TIMESTAMP('$now') - UNIX_TIMESTAMP(modified)"))
			trigger_error("Could not delete cached session data.");
		return true;
	}