bp_dd_get_random_users_ids( int $count = 1, string $output = 'array' )

function bp_dd_get_random_users_ids( $count = 1, $output = 'array' ) {
	$users_arr = (array) bp_get_option( 'bp_dd_imported_user_ids' );

	if ( ! empty( $users_arr ) ) {
		$total_members = count( $users_arr );
		if ( $count <= 0 || $count > $total_members ) {
			$count = $total_members;
		}

		// Get random users.
		$random_keys = (array) array_rand( $users_arr, $count );
		$users       = array();
		foreach ( $users_arr as $key => $value ) {
			if ( in_array( $key, $random_keys ) ) {
				$users[] = $value;
			}
		}
	} else {
		// Get by default (if no users were imported) all currently registered users.
		$users = get_users( array(
			'fields' => 'ID',
		) );
	}

	/*
	 * Convert to integers, because get_col() and get_users() return array of strings.
	 */
	$users = array_map( 'intval', $users );

	if ( $output === 'string' ) {
		return implode( ',', $users );
	}

	return $users;
}