pre_get_main_site_id – Hook | Developer.WordPress.org

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.

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

$main_site_id = (int) apply_filters( 'pre_get_main_site_id', null, $this );

Used by	Description
WP_Network::get_main_site_id()`wp-includes/class-wp-network.php`	Returns the main site ID for the network.

Version	Description
4.9.0	Introduced.

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