) )->clean_all( time() - static::LIFETIME, $time_limit );
	}

	/**
	 * Delete the nonces.
	 *
	 * @param int      $limit How many nonces to delete.
	 * @param null|int $cutoff_timestamp All nonces added before this timestamp will be removed.
	 *
	 * @return int|false Number of removed nonces, or `false` if nothing to remove (or in case of a database error).
	 */
	public function delete( $limit = 10, $cutoff_timestamp = null ) {
		global $wpdb;

		$ids = $wpdb->get_col(
			$wpdb->prepare(
				"SELECT option_id FROM `{$wpdb->options}`"
				. " WHERE `option_name` >= 'jetpack_nonce_' AND `option_name` < %s"
				. ' LIMIT %d',
				'jetpack_nonce_' . $cutoff_timestamp,
				$limit
			)
		);

		if ( ! is_array( $ids ) ) {
			// There's an error and we can't proceed.
			return false;
		}

		// Removing zeroes in case AUTO_INCREMENT of the options table is broken, and all ID's are zeroes.
		$ids = array_filter( $ids );

		if ( array() === $ids ) {
			// There's nothing to remove.
			return false;
		}

		$ids_fill = implode( ', ', array_fill( 0, count( $ids ), '%d' ) );

		$args   = $ids;
		$args[] = 'jetpack_nonce_%';

		// The Code Sniffer is unable to understand what's going on...
		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber
		return $wpdb->query( $wpdb->prepare( "DELETE FROM `{$wpdb->options}` WHERE `option_id` IN ( {$ids_fill} ) AND option_name LIKE %s", $args ) );
	}

	/**
	 * Clean the cached nonces valid during the current request, therefore making them invalid.
	 *
	 * @return bool
	 */
	public static function invalidate_request_nonces() {
		static::$nonces_used_this_request = array();

		return true;
	}
}