Adldap\Query\Builder::sortBy PHP Method

    public function sortBy($field, $direction = 'asc', $flags = null)
    {
        $this->sortByField = $field;
        // Lowercase direction for comparisons.
        $direction = strtolower($direction);
        if ($direction === 'asc' || $direction === 'desc') {
            $this->sortByDirection = $direction;
        }
        if (is_null($flags)) {
            $flags = SORT_NATURAL + SORT_FLAG_CASE;
        }
        $this->sortByFlags = $flags;
        return $this;
    }