WordPress Code Reference

pre_get_main_site_id

Summery Summery

Filters the main site ID.

apply_filters( 'pre_get_main_site_id', int|null $main_site_id, WP_Network $network )

Returning a positive integer will effectively short-circuit the function.

$main_site_id: If a positive integer is returned, it is interpreted as the main site ID.
$network: The network object for which the main site was detected.

Changelog
Version	Description
4.9.0	Introduced.