pre_get_main_site_id
Filter Hook: Filters the main site ID.
Source: wp-includes/class-wp-network.php:230
WP_Network::_set_site_name()
Method: Sets the site name assigned to the network if one has not been populated.
Source: wp-includes/class-wp-network.php:286
WP_Network::_set_cookie_domain()
Method: Sets the cookie domain based on the network domain if one has not been populated.
Source: wp-includes/class-wp-network.php:303