bp_groups_admin_process_group_type_bulk_changes( string $doaction )

function bp_groups_admin_process_group_type_bulk_changes( $doaction ) {
	// Bail if no groups are specified or if this isn't a relevant action.
	if ( empty( $_REQUEST['gid'] )
		|| ( empty( $_REQUEST['bp_change_type'] ) && empty( $_REQUEST['bp_change_type2'] ) )
		|| empty( $_REQUEST['bp_change_group_type'] )
	) {
		return;
	}

	// Bail if nonce check fails.
	check_admin_referer( 'bp-bulk-groups-change-type-' . bp_loggedin_user_id(), 'bp-bulk-groups-change-type-nonce' );

	if ( ! bp_current_user_can( 'bp_moderate' )  ) {
		return;
	}

	$new_type = '';
	if ( ! empty( $_REQUEST['bp_change_type2'] ) ) {
		$new_type = sanitize_text_field( $_REQUEST['bp_change_type2'] );
	} elseif ( ! empty( $_REQUEST['bp_change_type'] ) ) {
		$new_type = sanitize_text_field( $_REQUEST['bp_change_type'] );
	}

	// Check that the selected type actually exists.
	if ( 'remove_group_type' !== $new_type && null === bp_groups_get_group_type_object( $new_type ) ) {
		$error = true;
	} else {
		// Run through group ids.
		$error = false;
		foreach ( (array) $_REQUEST['gid'] as $group_id ) {
			$group_id = (int) $group_id;

			// Get the old group type to check against.
			$group_type = bp_groups_get_group_type( $group_id );

			if ( 'remove_group_type' === $new_type ) {
				// Remove the current group type, if there's one to remove.
				if ( $group_type ) {
					$removed = bp_groups_remove_group_type( $group_id, $group_type );
					if ( false === $removed || is_wp_error( $removed ) ) {
						$error = true;
					}
				}
			} else {
				// Set the new group type.
				if ( $new_type !== $group_type ) {
					$set = bp_groups_set_group_type( $group_id, $new_type );
					if ( false === $set || is_wp_error( $set ) ) {
						$error = true;
					}
				}
			}
		}
	}

	// If there were any errors, show the error message.
	if ( $error ) {
		$redirect = add_query_arg( array( 'updated' => 'group-type-change-error' ), wp_get_referer() );
	} else {
		$redirect = add_query_arg( array( 'updated' => 'group-type-change-success' ), wp_get_referer() );
	}

	wp_redirect( $redirect );
	exit();
}