get_blog_count() – Function | Developer.WordPress.org

Gets the number of active sites on the installation.

Description

The count is cached and updated twice daily. This is not a live count.

$network_idint|nulloptional: ID of the network. Default is the current network.
Default:null

int Number of active sites on the network.

function get_blog_count( $network_id = null ) {
	return get_network_option( $network_id, 'blog_count' );
}

Uses	Description
get_network_option()`wp-includes/option.php`	Retrieves a network’s option value based on the option name.

Used by	Description
wp_network_dashboard_right_now()`wp-admin/includes/dashboard.php`
wp_version_check()`wp-includes/update.php`	Checks WordPress version against the newest version.
wp_is_large_network()`wp-includes/ms-functions.php`	Determines whether or not we have a large network.
get_sitestats()`wp-includes/ms-functions.php`	Gets the network’s site and user counts.

Version	Description
MU (3.0.0)	MU (3.0.0)
4.8.0	The `$network_id` parameter is now being used.
3.7.0	Introduced.