BP_Members_Admin::single_site_registration_on( string $old_value, string $value )

	public function single_site_registration_on( $old_value, $value ) {
		// Single site.
		if ( ! is_multisite() && ! empty( $value ) ) {
			bp_core_add_page_mappings( array(
				'register' => 1,
				'activate' => 1
			) );

			// Update site registrations options based on the BuddyBoss general registration settings.
			bp_update_option( 'bp-enable-site-registration', 1 );

		} else {

			// Update site registrations options based on the BuddyBoss general registration settings.
			bp_update_option( 'bp-enable-site-registration', 0 );

		}
	}