function bp_group_admin_ids( $group = false, $format = 'string' ) {
	global $groups_template;

	if ( empty( $group ) ) {
		$group =& $groups_template->group;
	}

	$admin_ids = array();

	if ( $group->admins ) {
		foreach( $group->admins as $admin ) {
			$admin_ids[] = $admin->user_id;
		}
	}

	if ( 'string' == $format ) {
		$admin_ids = implode( ',', $admin_ids );
	}

	/**
	 * Filters a list of user IDs for a group's admins.
	 *
	 * This filter may return either an array or a comma separated string.
	 *
	 * @since 1.5.0
	 * @since 2.5.0 Added the `$group` parameter.
	 *
	 * @param array|string $admin_ids List of user IDs for a group's admins.
	 * @param object       $group     Group object.
	 */
	return apply_filters( 'bp_group_admin_ids', $admin_ids, $group );
}