Source Reference:

• Component: BuddyPress :: bp-groups

  File: /bp-groups/bp-groups-template.php :: Trac Source Line: 637

  	if ( $group->admins ) {
  		foreach( $group->admins as $admin ) {
  			$admin_ids[] = $admin->user_id;
  		}
  	}
  
  	if ( 'string' == $format )
  		$admin_ids = implode( ',', $admin_ids );
  
  	return apply_filters( 'bp_group_admin_ids', $admin_ids );
  }
  
  /**
   * Return a list of user_ids for a group's moderators
   *
   * @package BuddyPress
   * @since 1.5
   *
   * @param obj $group (optional) The group being queried. Defaults to the current group in the loop
   * @param str $format 'string' to get a comma-separated string, 'array' to get an array