get_network( WP_Network|int|null $network = null ): WP_Network|null

23function get_network( $network = null ) {24	global $current_site;25	if ( empty( $network ) && isset( $current_site ) ) {26		$network = $current_site;27	}28 29	if ( $network instanceof WP_Network ) {30		$_network = $network;31	} elseif ( is_object( $network ) ) {32		$_network = new WP_Network( $network );33	} else {34		$_network = WP_Network::get_instance( $network );35	}36 37	if ( ! $_network ) {38		return null;39	}40 41	/**42	 * Fires after a network is retrieved.43	 *44	 * @since 4.6.045	 *46	 * @param WP_Network $_network Network data.47	 */48	$_network = apply_filters( 'get_network', $_network );49 50	return $_network;51}