The get_main_site_id() WordPress PHP function retrieves the main site ID of a network.
Usage
To use the function, simply call it and pass the network ID as a parameter if needed. If no parameter is provided, it will return the main site ID of the current network.
$main_site_id = get_main_site_id($network_id);
Parameters
$network_id(int, optional) – The ID of the network for which to get the main site. Defaults to the current network. Default:null.
More information
See WordPress Developer Resources: get_main_site_id()
Examples
Get main site ID of current network
This example retrieves the main site ID of the current network.
$main_site_id = get_main_site_id(); echo 'The main site ID is: ' . $main_site_id;
Get main site ID of a specific network
In this example, we get the main site ID of a specific network by providing the network ID.
$network_id = 2; $main_site_id = get_main_site_id($network_id); echo 'The main site ID for network ' . $network_id . ' is: ' . $main_site_id;
Display main site URL
This example retrieves the main site ID and uses it to display the main site URL.
$main_site_id = get_main_site_id(); $main_site_url = get_site_url($main_site_id); echo 'The main site URL is: ' . $main_site_url;
Get main site title
In this example, we get the main site title by first retrieving the main site ID.
$main_site_id = get_main_site_id();
$main_site_title = get_bloginfo('name', '', $main_site_id);
echo 'The main site title is: ' . $main_site_title;
Get main site theme
This example retrieves the main site ID and uses it to get the active theme of the main site.
$main_site_id = get_main_site_id(); $main_site_theme = get_blog_option($main_site_id, 'stylesheet'); echo 'The main site theme is: ' . $main_site_theme;