Excludes users by role from the BuddyPress loop

/*********************************************************/
/* Excludes users with role of "suspended" from the loop */
/*********************************************************/

function bgmc_get_user_ids_by_role($role) {
    $users = array();
    $founded_users = get_users( array( 'role' => $role ) );
    if ( !empty( $founded_users) ) foreach ( (array)$founded_users as $user ) $users[] = $user->ID;
    return $users;
}

function bgmc_exclude_by_role( $exclude_roles, $implode = true ) {
    $memberArray = array();
    foreach ( $exclude_roles as $exclude_role ) $memberArray = array_merge( $memberArray, bgmc_get_user_ids_by_role( $exclude_role ) );

    if ( !$implode ) return $memberArray;

    $theExcludeString = implode( ",", $memberArray );

    return $theExcludeString;
}

function bgmc_exclude_byroles( $qs=false,$object=false ) {

    if ( $object!='members' ) return $qs; //hide for members only

    $args = wp_parse_args( $qs );

    if ( !empty( $args['user_id'] ) ) return $qs; //check if we are searching for friends list etc?, do not exclude in this case

    $excluded_roles = array( 'suspended' ); // you can add roles here

    $exclude = get_transient( 'excluded_members' ); // Use a transient to prevent overloading the database on sites with a lot of members

    if ( !$exclude ) :
        $exclude = bgmc_exclude_by_role( $excluded_roles );
        set_transient( 'excluded_members', $exclude, WEEK_IN_SECONDS );
    endif;

    if ( !empty( $args['exclude'] ) ):
        $args['exclude'] = $args['exclude'].','.$exclude;
    else:
        $args['exclude'] = $exclude;
    endif;

    $qs = build_query($args);

    return $qs;
}
add_action( 'bp_ajax_querystring', 'bgmc_exclude_byroles', 20, 2 );