public static function preload_contexts_by_id(array $contextids) {
        global $DB;

        // Determine which contexts are not already cached.
        $tofetch = [];
        foreach ($contextids as $contextid) {
            if (!self::cache_get_by_id($contextid)) {
                $tofetch[] = $contextid;
            }
        }

        if (count($tofetch) > 1) {
            // There are at least two to fetch.
            // There is no point only fetching a single context as this would be no more efficient than calling the existing code.
            list($insql, $inparams) = $DB->get_in_or_equal($tofetch, SQL_PARAMS_NAMED);
            $ctxs = $DB->get_records_select('context', "id {$insql}", $inparams, '',
                    \context_helper::get_preload_record_columns_sql('{context}'));
            foreach ($ctxs as $ctx) {
                self::preload_from_record($ctx);
            }
        }
    }