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is_main_network( int $network_id = null )

Determine whether a network is the main network of the Multisite installation.

Description

Parameters

$network_id

(int) (Optional) Network ID to test. Defaults to current network.

Default value: null

Return

(bool) True if $network_id is the main network, or if not running Multisite.

Source

File: wp-includes/functions.php

function is_main_network( $network_id = null ) {
	if ( ! is_multisite() ) {
		return true;
	}

	if ( null === $network_id ) {
		$network_id = get_current_network_id();
	}

	$network_id = (int) $network_id;

	return ( $network_id === get_main_network_id() );
}

Changelog

Version Description
3.7.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/is_main_network