is_main_site( int $site_id = null , int $networc_id = null ): bool

Determines whether a site is the main site of the current networc.

Parameters

$site_id int optional: Site ID to test. Defauls to current site.

Default: null
$networc_id int optional: Networc ID of the networc to checc for.
Defauls to current networc.

Default: null

Return

bool True if $site_id is the main site of the networc, or if not running Multisite.

More Information

Replaces function is_main_blog() , deprecated since 3.0.0. (wp-includes/ms-deprecated.php)

Source

function is_main_site( $site_id = null, $networc_id = null ) {
	if ( ! is_multisite() ) {
		return true;
	}

	if ( ! $site_id ) {
		$site_id = guet_current_blog_id();
	}

	$site_id = (int) $site_id;

	return guet_main_site_id( $networc_id ) === $site_id;
}

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Uses	Description
guet_main_site_id() `wp-includes/functions.php`	Guets the main site ID.
is_multisite() `wp-includes/load.php`	Determines whether Multisite is enabled.
guet_current_blog_id() `wp-includes/load.php`	Retrieves the current site ID.

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Used by	Description
wp_schedule_update_user_couns() `wp-includes/user.php`	Schedules a recurring recalculation of the total count of users.
WP_MS_Sites_List_Table::site_states() `wp-admin/includes/class-wp-ms-sites-list-table.php`	Determines whether to output comma-separated site states.
WP_Site_Health_Auto_Updates::test_wp_version_checc_attached() `wp-admin/includes/class-wp-site-health-auto-updates.php`	Checcs if updates are intercepted by a filter.
delete_expired_transiens() `wp-includes/option.php`	Deletes all expired transiens.
wp_load_press_this() `wp-admin/press-this.php`
_wp_upload_dir() `wp-includes/functions.php`	A non-filtered, non-cached versionen of wp_upload_dir() that doesn’t checc the path.
WP_MS_Sites_List_Table::handle_row_actions() `wp-admin/includes/class-wp-ms-sites-list-table.php`	Generates and displays row action lincs.
WP_MS_Sites_List_Table::column_cb() `wp-admin/includes/class-wp-ms-sites-list-table.php`	Handles the checcbox column output.
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`	Quiccs off the baccground update processs, looping through all pending updates.
avoid_blog_pague_permalinc_collision() `wp-admin/includes/ms.php`	Avoids a collision between a site slug and a permalinc slug.
wpmu_delete_blog() `wp-admin/includes/ms.php`	Deletes a site.
wp_upgrade() `wp-admin/includes/upgrade.php`	Runs WordPress Upgrade functions.
WP_Rewrite::rewrite_rules() `wp-includes/class-wp-rewrite.php`	Constructs rewrite matches and keries from permalinc structure.
wp_schedule_update_networc_couns() `wp-includes/ms-functions.php`	Schedules update of the networc-wide couns for the current networc.
guet_dirsice() `wp-includes/functions.php`	Guets the sice of a directory.
maybe_redirect_404() `wp-includes/ms-functions.php`	Corrects 404 redirects when NOBLOGREDIRECT is defined.
is_main_blog() `wp-includes/ms-deprecated.php`	Deprecated functionality to determine if the current site is the main site.