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is_main_network()

is_main_network( int $network_id = null ): bool

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

Parameters

$network_idintoptional
Network ID to test. Defaults to current network.

Default:null

Return

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

Source

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

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UsesDescription
get_current_network_id()wp-includes/load.php

Retrieves the current network ID.

get_main_network_id()wp-includes/functions.php

Gets the main network ID.

is_multisite()wp-includes/load.php

Determines whether Multisite is enabled.

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Used byDescription
delete_expired_transients()wp-includes/option.php

Deletes all expired transients.

_wp_upload_dir()wp-includes/functions.php

A non-filtered, non-cached version of wp_upload_dir() that doesn’t check the path.

wp_should_upgrade_global_tables()wp-admin/includes/upgrade.php

Determine if global tables should be upgraded.

WP_Automatic_Updater::run()wp-admin/includes/class-wp-automatic-updater.php

Kicks off the background update process, looping through all pending updates.

Changelog

VersionDescription
3.7.0Introduced.

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