apply_filters( 'pre_get_main_site_id', int|null $main_site_id, WP_Network $network )  Filters the main site ID.   Description Returning a positive integer will effectively short-circuit the function.   Parameters   $main_site_id int|null    If a positive integer is returned, it is interpreted as the main site ID.    $network WP_Network    The network object for which the main site was detected.      Source  File: wp-includes/class-wp-network.php. View all references  $main_site_id = (int) apply_filters( 'pre_get_main_site_id', null, $this );
   Related  Used By    Used By Description      WP_Network8b7c:f320:99b9:690f:4595:cd17:293a:c069get_main_site_id() wp-includes/class-wp-network.php   Returns the main site ID for the network.   
    Changelog    Version Description     4.9.0 Introduced.    

    
{'path': 'public/docs/wordpress/hooks/pre_get_main_site_id.html', 'source': 'DevDocs.IO'}