wp_initialize_site action-hook . WP 5.1.0

Fires when a site's initialization routine should be executed.

Usage

add_action( 'wp_initialize_site', 'action_function_name_9895', 10, 2 );
function action_function_name_9895( $new_site, $args ){
	// action...
}

$new_site(WP_Site)

New site object.

$args(array)

Arguments for the initialization.

Where the hook is called

do_action( 'wp_initialize_site', $new_site, $args );

Where the hook is used (in WP core)

add_action( 'wp_initialize_site', 'wp_initialize_site', 10, 2 );

add_action( 'wp_initialize_site', 'wpmu_log_new_registrations', 100, 2 );

add_action( 'wp_initialize_site', 'newblog_notify_siteadmin', 100, 1 );